| Trail Name | National Park | Sublocation | Trail Length | Elevation Gain | Trail Difficulty | Weighted Difficulty |
|---|---|---|---|---|---|---|
| 4-Mile Trail | Yosemite | Yosemite Valley | 5 | 3 | 7.86 | 7.7 |
| Abrams Falls | Great Smoky Mountains | Cades Cove / Townsend | 5 | 675 | 6.6 | 6.6 |
| Ace Gap | Great Smoky Mountains | Cades Cove / Townsend | 11 | 400 | 5.2 | 5.2 |
| Adams Falls | Rocky Mountain | West Side | 1 | 113 | 0.2 | 0.2 |
| Alaska Basin | Grand Teton | Teton Canyon | 17 | 2635 | 7.6 | 7.6 |
| Alberta Falls | Rocky Mountain | Bear Lake Road | 2 | 200 | 0.7 | 0.7 |
| Albright Grove | Great Smoky Mountains | Greenbrier / Cosby | 7 | 1475 | 4.2 | 4.2 |
| Alpine Ridge Trail | Rocky Mountain | Alpine Visitor Center | 1 | 209 | 0.1 | 0.1 |
| Alum Cave | Great Smoky Mountains | Gatlinburg / Mt. LeConte | 4 | 1125 | 2.8 | 2.8 |
| Amphitheater Lake | Grand Teton | Lupine Meadows | 10 | 2980 | 5.6 | 5.6 |
| Andrews Bald | Great Smoky Mountains | Newfound Gap / Clingmans Dome | 4 | 899 | 2.2 | 2.2 |
| Andrews Tarn (Glacier) | Rocky Mountain | Bear Lake Road | 9 | 2 | 7.1 | 7.1 |
| Apgar Lookout | Glacier | Lake McDonald | 7 | 1845 | 5.1 | 5.1 |
| Apikuni Falls | Glacier | Many Glacier | 2 | 625 | 1.2 | 1.2 |
| Appistoki Falls | Glacier | Two Medicine? | 1 | 175 | 0.5 | 0.5 |
| Artist Paint Pots | Yellowstone | Norris Geyser Basin Area | 1 | 0 | 1.72 | 1.7 |
| Artist Point | Yosemite | Yosemite Valley | 2 | 500 | 2.43 | 2.4 |
| Aspen Ridge-Boulder Ridge Loop | Grand Teton | Phelps Lake | 6 | 785 | 2.6 | 2.6 |
| Aster Falls | Glacier | Two Medicine? | 3 | 320 | 1.4 | 1.4 |
| Aster Park Overlook | Glacier | Two Medicine? | 4 | 780 | 2.5 | 2.5 |
| Avalanche Lake | Glacier | Lake McDonald | 5 | 730 | 2.7 | 2.7 |
| Baker Pass | Rocky Mountain | West Side | 12 | 2 | 8.8 | 8.8 |
| Baker Pass-Parika Lake Loop | Rocky Mountain | West Side | 14 | 2 | 9.8 | 9.8 |
| Balanced Rock | Rocky Mountain | Estes Park | 8 | 1 | 5 | 4.9 |
| Balsam High Top | Great Smoky Mountains | Balsam Mountain | 8 | 2535 | 5.6 | 5.6 |
| Baring Falls | Glacier | St. Mary Lake | 1 | 160 | 0.2 | 0.2 |
| Bartlett Lake | Glacier Bay | Glacier Bay | 6 | 1200 | 8.4 | 8.4 |
| Bartlett River | Glacier Bay | Glacier Bay | 4 | 200 | 3 | 3.0 |
| Baskins Creek Falls | Great Smoky Mountains | Gatlinburg / Mt. LeConte | 3 | 953 | 2.1 | 2.1 |
| Bathtub Lake Loop | Lassen Volcanic | 1 | 55 | 3.6 | 3.6 | |
| Bear Lake Loop | Rocky Mountain | Bear Lake Road | 1 | 45 | 0 | 0.0 |
| Bear Lake to Fern Lake TH | Rocky Mountain | Bear Lake Road | 9 | 1 | 5.9 | 5.9 |
| Bearpaw Lake | Grand Teton | Leigh Lake | 8 | 110 | 2.7 | 2.7 |
| Beaver Pond Loop | Glacier | St. Mary Lake | 4 | 350 | 1.8 | 1.8 |
| Beaver Ponds Trail | Yellowstone | Mammoth Hot Springs | 5 | 0 | 6.6 | 6.6 |
| Belly River Ranger Station | Glacier | Many Glacier | 12 | 870 | 6.7 | 6.7 |
| Bierstadt Lake | Rocky Mountain | Bear Lake Road | 2 | 675 | 1.6 | 1.6 |
| Bierstadt Lake (via Bear Lake) | Rocky Mountain | Bear Lake Road | 4 | 630 | 2.6 | 2.6 |
| Bierstadt Lake Loop | Rocky Mountain | Bear Lake Road | 3 | 725 | 2.1 | 2.1 |
| Big Creek / Mouse Creek Falls | Great Smoky Mountains | Big Creek | 4 | 605 | 2.3 | 2.3 |
| Big Fork Ridge Loop | Great Smoky Mountains | Cataloochee | 9 | 1800 | 5.7 | 5.7 |
| Big Meadows | Rocky Mountain | West Side | 4 | 740 | 2.3 | 2.3 |
| Black Canyon Overlook | Grand Teton | Teton Pass | 4 | 848 | 1.8 | 1.8 |
| Black Lake | Rocky Mountain | Bear Lake Road | 10 | 1 | 6.4 | 6.4 |
| Bluebird Lake | Rocky Mountain | Wild Basin | 13 | 2 | 9.2 | 9.2 |
| Boiling River Trail | Yellowstone | Mammoth Hot Springs | 1 | 300 | 2.93 | 2.9 |
| Boiling Springs Lake | Lassen Volcanic | 3 | 200 | 1.43 | 1.4 | |
| Boogerman Loop | Great Smoky Mountains | Cataloochee | 7 | 1040 | 4.1 | 4.1 |
| Bridal Veil Falls | Rocky Mountain | Estes Park | 6 | 990 | 4 | 4.0 |
| Bridalveil Creek | Yosemite | Glacier Point Road | 6 | 100 | 7.43 | 7.4 |
| Bridalveil Fall | Yosemite | Yosemite Valley | 1 | 200 | 1.01 | 1.0 |
| Broken Arch | Arches | Arches South | 1 | 175 | 3 | 3.0 |
| Brokeoff Mountain | Lassen Volcanic | 7 | 1200 | 4.33 | 4.3 | |
| Brushy Mountain (Greenbrier) | Great Smoky Mountains | Greenbrier / Cosby | 12 | 3000 | 7.9 | 7.9 |
| Brushy Mountain?(Trillium Gap) | Great Smoky Mountains | Gatlinburg / Mt. LeConte | 7 | 1745 | 4.5 | 4.5 |
| Bullhead Lake | Glacier | Many Glacier | 7 | 425 | 3.7 | 3.7 |
| Bullhead Trail | Great Smoky Mountains | Gatlinburg / Mt. LeConte | 6 | 1607 | 4 | 4.0 |
| Bumpass Hell | Lassen Volcanic | 3 | 200 | 3 | 3.0 | |
| Butte Lake to Widow Lake | Lassen Volcanic | 5 | 400 | 5.3 | 5.3 | |
| Cache Creek Trail | Yellowstone | Northeast Quadrant | 6 | 560 | 1.73 | 1.7 |
| Cactus Forest | Saguaro | 6 | 250 | 3 | 3.0 | |
| Calypso Cascades | Rocky Mountain | Wild Basin | 4 | 610 | 2.2 | 2.2 |
| Carlon Falls | Yosemite | Hetch Hetchy and Big Oak Flat | 4 | 200 | 1.44 | 1.4 |
| Cascade Canyon | Grand Teton | Jenny Lake | 10 | 1110 | 4.2 | 4.2 |
| Cascade Falls | Rocky Mountain | West Side | 7 | 430 | 3.7 | 3.8 |
| Cataloochee Divide | Great Smoky Mountains | Cataloochee | 10 | 1250 | 5.5 | 5.5 |
| Cathedral Lakes | Yosemite | Tioga Road | 7 | 800 | 8.3 | 8.3 |
| Chapin / Chiquita / Ypsilon | Rocky Mountain | Alpine Visitor Center | 8 | 3 | 7.5 | 7.5 |
| Charlies Bunion | Great Smoky Mountains | Newfound Gap / Clingmans Dome | 8 | 1640 | 5 | 5.0 |
| Chasm Lake | Rocky Mountain | Longs Peak | 9 | 2 | 6.9 | 6.9 |
| Chasteen Creek Cascade | Great Smoky Mountains | Cherokee / Deep Creek | 4 | 340 | 1.8 | 1.8 |
| Chestnut Top | Great Smoky Mountains | Cades Cove / Townsend | 9 | 1486 | 5.1 | 5.1 |
| Chilnualna Falls | Yosemite | Southern Yosemite | 8 | 2 | 8.12 | 8.1 |
| Chimney Tops | Great Smoky Mountains | Gatlinburg / Mt. LeConte | 4 | 1487 | 2.9 | 2.9 |
| Cholla | Saguaro | 1 | 0 | 0.4 | 0.4 | |
| Christian Pond Loop | Grand Teton | Jackson Lake | 4 | 250 | 1.3 | 1.3 |
| Cinder Cone | Lassen Volcanic | 4 | 800 | 7.34 | 7.3 | |
| Clouds Rest | Yosemite | Tioga Road | 15 | 1 | 9.55 | 9.6 |
| Coal Creek Meadows | Grand Teton | Coal Creek Trailhead | 6 | 1970 | 3.3 | 3.3 |
| Cobalt Lake | Glacier | Two Medicine? | 11 | 1450 | 6.8 | 6.8 |
| Cold Boiling and Crumbaugh Lakes | Lassen Volcanic | 3 | 200 | 3.22 | 3.2 | |
| Columbia Rock | Yosemite | Yosemite Valley | 3 | 1 | 4.6 | 4.6 |
| Copeland Falls | Rocky Mountain | Wild Basin | 1 | 75 | 0.1 | 0.1 |
| Cove Mountain | Great Smoky Mountains | Elkmont | 8 | 1776 | 4.9 | 4.9 |
| Cowhead Saddle | Saguaro | 4 | 1 | 3.8 | 3.8 | |
| Coyote Valley Trail | Rocky Mountain | West Side | 1 | 15 | 0.1 | 0.1 |
| Cracker Lake | Glacier | Many Glacier | 13 | 1400 | 7.4 | 7.4 |
| Crags Lake | Lassen Volcanic | 4 | 510 | 7.34 | 7.3 | |
| Crevice Creek Trail | Yellowstone | Northwest Quadrant | 2 | 340 | 2.26 | 2.3 |
| Crystal Lake | Rocky Mountain | Estes Park | 15 | 3 | 7.7 | 7.7 |
| Cub Lake | Rocky Mountain | Estes Park | 5 | 570 | 2.8 | 2.8 |
| Cucumber Gap Loop | Great Smoky Mountains | Elkmont | 6 | 830 | 3.1 | 3.1 |
| Cunningham Cabin | Grand Teton | Moran Junction | 1 | 10 | 0 | 0.0 |
| Curry Mountain Trail | Great Smoky Mountains | Elkmont | 6 | 1164 | 3.8 | 3.8 |
| Cygnet Lakes Trail | Yellowstone | Norris Geyser Basin Area | 8 | 1600 | 2.03 | 2.0 |
| Darby Wind Cave | Grand Teton | South Fork Darby Canyon | 5 | 1800 | 3 | 3.0 |
| Dawson Pass | Glacier | Two Medicine? | 9 | 2450 | 6.9 | 6.9 |
| Deadwood Falls | Glacier | Logan Pass | 2 | 665 | 1.5 | 1.5 |
| Death Canyon Patrol Cabin | Grand Teton | Death Canyon | 8 | 2040 | 4.1 | 4.1 |
| Deep Creek Headwaters | Great Smoky Mountains | Newfound Gap / Clingmans Dome | 5 | 1480 | 3.4 | 3.4 |
| Deep Creek Loop | Great Smoky Mountains | Cherokee / Deep Creek | 5 | 579 | 2.4 | 2.4 |
| Deer Mountain | Rocky Mountain | Estes Park | 6 | 1 | 4.3 | 4.3 |
| Delacy Creek Trail | Yellowstone | Southwest Quadrant | 6 | 1160 | 8.54 | 8.5 |
| Delicate Arch | Arches | Arches South | 3 | 140 | 4 | 4.0 |
| Delicate Arch Viewpoint? | Arches | Arches North | 0 | 0 | 1.3 | 1.3 |
| Desert Ecology | Saguaro | 0 | 0 | 0.1 | 0.1 | |
| Desert Nature Trail? | Arches | Arches South | 0 | 15 | 0.3 | 0.3 |
| Devastated Area Interpretive Loop | Lassen Volcanic | 0 | 25 | 0.2 | 0.2 | |
| Devils Garden Primitive Loop? | Arches | Arches North | 7 | 1200 | 9.2 | 9.2 |
| Devils Kitchen | Lassen Volcanic | 4 | 100 | 2.54 | 2.5 | |
| Dewey, Crocker, & Stanford Points | Yosemite | Glacier Point Road | 8 | 300 | 8.34 | 8.3 |
| Divide Trail | Yellowstone | Southwest Quadrant | 5 | 1000 | 8.37 | 8.4 |
| Dog Lake | Yosemite | Tioga Road | 3 | 750 | 6.5 | 6.5 |
| Dogshead Trail | Yellowstone | Southwest Quadrant | 5 | 460 | 6.92 | 6.9 |
| Double Arch? | Arches | Arches North | 1 | 70 | 2.4 | 2.4 |
| Double O Arch | Arches | Arches West | 4 | 155 | 3 | 3.0 |
| Douglas Spring | Saguaro | 9 | 3 | 8 | 8.0 | |
| Drake Lake | Lassen Volcanic | 4 | 350 | 2.64 | 2.6 | |
| Dream Lake | Rocky Mountain | Bear Lake Road | 2 | 450 | 1.3 | 1.3 |
| Dream Lake Basin | Lassen Volcanic | 1 | 90 | 0.56 | 0.7 | |
| Echo Lake | Lassen Volcanic | 4 | 470 | 4.7 | 4.7 | |
| Elizabeth Lake | Yosemite | Tioga Road | 5 | 900 | 6.55 | 6.6 |
| Emerald Lake | Rocky Mountain | Bear Lake Road | 4 | 650 | 2.2 | 2.2 |
| Emma Matilda Lake Loop (via JL Lodge) | Grand Teton | Jackson Lake | 11 | 750 | 4.2 | 4.2 |
| Emma Matilda Lake Loop (via Two Ocean) | Grand Teton | Two Ocean | 11 | 600 | 4.2 | 4.2 |
| Enchanted Forest | Glacier Bay | Glacier Bay | 1 | 200 | 3.3 | 3.3 |
| Estes Cone (via Lily Lake) | Rocky Mountain | Longs Peak | 8 | 2 | 6.1 | 6.1 |
| Estes Cone (via Longs Peak) | Rocky Mountain | Longs Peak | 7 | 1 | 5.1 | 5.1 |
| Eugenia Mine | Rocky Mountain | Longs Peak | 3 | 540 | 1.7 | 1.7 |
| Fan Creek Trail | Yellowstone | Northwest Quadrant | 5 | 1500 | 3.86 | 3.9 |
| Fawn Pass Trail | Yellowstone | Northwest Quadrant | 21 | 4160 | 8.79 | 8.8 |
| Fern Falls | Rocky Mountain | Estes Park | 5 | 700 | 3.2 | 3.2 |
| Fern Lake | Rocky Mountain | Estes Park | 8 | 1 | 5.2 | 5.2 |
| Finch Lake | Rocky Mountain | Wild Basin | 9 | 1 | 6.3 | 6.3 |
| Firebrand Pass | Glacier | Two Medicine? | 10 | 1950 | 6.8 | 6.8 |
| Fish Lake | Glacier | Lake McDonald | 6 | 1210 | 3.8 | 3.8 |
| Flagg Canyon | Grand Teton | Flagg Ranch | 4 | 150 | 1.4 | 1.5 |
| Flat Creek Falls? | Great Smoky Mountains | Balsam Mountain | 4 | 600 | 2.2 | 2.2 |
| Flattop Mountain | Rocky Mountain | Bear Lake Road | 9 | 2 | 7.5 | 7.5 |
| Florence Falls | Glacier | Logan Pass | 10 | 975 | 5.6 | 5.6 |
| Forest and Fire Nature Trail | Glacier | Lake McDonald | 1 | 180 | 0.4 | 0.4 |
| Forest Canyon Pass | Rocky Mountain | Alpine Visitor Center | 5 | 600 | 2.8 | 2.8 |
| Forest Loop | Glacier Bay | Glacier Bay | 1 | 150 | 2 | 2.0 |
| Foresta Falls | Yosemite | Hetch Hetchy and Big Oak Flat | 2 | 200 | 1.44 | 1.4 |
| Fork Ridge Trail | Great Smoky Mountains | Newfound Gap / Clingmans Dome | 8 | 1500 | 4.8 | 4.8 |
| Fountain Flats Freight Road | Yellowstone | Lower and Midway Geyser Basin | 5 | 1380 | 2.48 | 2.5 |
| Fountain Paint Pots Trail | Yellowstone | Lower and Midway Geyser Basin | 1 | 50 | 4.26 | 4.3 |
| Four Lakes Loop | Rocky Mountain | Bear Lake Road | 6 | 1 | 3.7 | 3.7 |
| Freeman Homestead | Saguaro | 1 | 100 | 0.6 | 0.6 | |
| Gable Pass | Glacier | Many Glacier | 13 | 2250 | 8.5 | 8.5 |
| Garnet Canyon | Grand Teton | Lupine Meadows | 8 | 2240 | 4.4 | 4.4 |
| Gaylor Lakes | Yosemite | Tioga Road | 3 | 600 | 7.4 | 7.4 |
| Gem Lake | Rocky Mountain | Estes Park | 4 | 1 | 2.6 | 2.6 |
| Glacier Point | Yosemite | Glacier Point Road | 1 | 50 | 0.95 | 1.0 |
| Glen Aulin (Tuolumne Falls/White Cascade) | Yosemite | Tioga Road | 13 | 600 | 7.89 | 7.9 |
| Gneiss Creek Trail | Yellowstone | Northwest Quadrant | 9 | 2580 | 7.81 | 7.8 |
| Goldmine Loop | Great Smoky Mountains | Cherokee / Deep Creek | 3 | 615 | 1.8 | 1.8 |
| Grand View Point | Grand Teton | Jackson Lake | 6 | 790 | 2.6 | 2.6 |
| Granite Canyon Loop | Grand Teton | Teton Village | 13 | 640 | 4.9 | 4.9 |
| Granite Falls | Rocky Mountain | West Side | 10 | 1120 | 6.5 | 6.5 |
| Granite Park Chalet (via Highline) | Glacier | Logan Pass | 15 | 1920 | 9.3 | 9.3 |
| Granite Park Chalet (via The Loop) | Glacier | Logan Pass | 8 | 2450 | 6.4 | 6.4 |
| Grapeyard Ridge Trail?(Greenbrier) | Great Smoky Mountains | Greenbrier / Cosby | 6 | 980 | 3.3 | 3.3 |
| Grebe Lake?Trail | Yellowstone | Northwest Quadrant | 7 | 0 | 2.36 | 2.4 |
| Green Mountain-Onahu Creek Loop | Rocky Mountain | West Side | 8 | 1300 | 5.1 | 5.1 |
| Gregory Bald (Parson Branch) | Great Smoky Mountains | Cades Cove / Townsend | 9 | 2300 | 5.9 | 5.9 |
| Gregory Bald?(Gregory Ridge) | Great Smoky Mountains | Cades Cove / Townsend | 11 | 3020 | 7.7 | 7.7 |
| Grinnell Glacier | Glacier | Many Glacier | 8 | 1840 | 5.4 | 5.4 |
| Grinnell Lake | Glacier | Many Glacier | 3 | 220 | 1.4 | 1.4 |
| Grotto Falls | Great Smoky Mountains | Gatlinburg / Mt. LeConte | 3 | 585 | 1.5 | 1.5 |
| Gunsight Lake | Glacier | Logan Pass | 13 | 1500 | 7.5 | 7.5 |
| Half Dome | Yosemite | Yosemite Valley | 14 | 4 | 9.98 | 10.0 |
| Hallett Peak | Rocky Mountain | Bear Lake Road | 10 | 3 | 8.7 | 8.7 |
| Happy Isles | Yosemite | Yosemite Valley | 1 | 10 | 0.53 | 0.5 |
| Harden Lake | Yosemite | Tioga Road | 6 | 300 | 6.6 | 6.6 |
| Harlequin Lake | Yellowstone | Madison River | 1 | 100 | 8.9 | 8.9 |
| Hat Lake to?Paradise Meadow | Lassen Volcanic | 3 | 140 | 3.6 | 3.6 | |
| Heart Lake?Trail | Yellowstone | Southeast Quadrant | 8 | 0 | 0.7 | 0.7 |
| Heartbreak Ridge | Saguaro | 6 | 2 | 5 | 5.0 | |
| Hellroaring Creek Trail | Yellowstone | Northeast Quadrant | 4 | 400 | 2.51 | 2.5 |
| Hemphill Bald Loop | Great Smoky Mountains | Balsam Mountain | 14 | 2170 | 8 | 8.0 |
| Hen Wallow Falls | Great Smoky Mountains | Greenbrier / Cosby | 4 | 900 | 2.6 | 2.6 |
| Hermitage Point | Grand Teton | Colter Bay | 10 | 380 | 3.7 | 3.8 |
| Heron Pond-Swan Lake Loop | Grand Teton | Colter Bay | 3 | 115 | 1.1 | 1.1 |
| Hidden Falls | Grand Teton | Jenny Lake | 1 | 230 | 0.5 | 0.7 |
| Hidden Lake | Glacier | Logan Pass | 5 | 1325 | 3.7 | 3.7 |
| Hidden Lake Overlook | Glacier | Logan Pass | 3 | 540 | 1.6 | 1.6 |
| Highline Loop | Glacier | Logan Pass | 12 | 1950 | 7.6 | 7.6 |
| Highline Trail to Haystack Pass | Glacier | Logan Pass | 7 | 825 | 4.1 | 4.1 |
| Holly Lake | Grand Teton | Leigh Lake | 13 | 2575 | 6.3 | 6.3 |
| Holzwarth Historic Site | Rocky Mountain | West Side | 1 | 70 | 0.3 | 0.3 |
| Hope Camp | Saguaro | 3 | 0 | 1.4 | 1.4 | |
| Horseshoe Lake | Lassen Volcanic | 3 | 50 | 2.53 | 2.5 | |
| Howe Lake | Glacier | Lake McDonald | 4 | 240 | 1.9 | 1.9 |
| Huckleberry Mountain Lookout | Glacier | Lake McDonald | 12 | 3400 | 9.1 | 9.1 |
| Huskey Gap (Little River Trail) | Great Smoky Mountains | Elkmont | 10 | 1080 | 5.3 | 5.3 |
| Huskey Gap?(Newfound Gap Rd) | Great Smoky Mountains | Gatlinburg / Mt. LeConte | 4 | 1270 | 2.9 | 2.9 |
| Ice Lake Trail | Yellowstone | Northwest Quadrant | 5 | 0 | 0.8 | 0.8 |
| Iceberg Lake | Glacier | Many Glacier | 10 | 1275 | 5.8 | 5.8 |
| Illilouette Falls | Yosemite | Glacier Point Road | 4 | 1 | 5.1 | 5.1 |
| Indian Creek Falls | Great Smoky Mountains | Cherokee / Deep Creek | 2 | 150 | 0.8 | 0.8 |
| Inspiration Point | Grand Teton | Jenny Lake | 2 | 450 | 0.9 | 0.9 |
| Jenny Lake Loop | Grand Teton | Jenny Lake | 8 | 275 | 2.7 | 2.7 |
| Johns Lake Loop | Glacier | Lake McDonald | 2 | 225 | 0.8 | 0.8 |
| Jump Off, The | Great Smoky Mountains | Newfound Gap / Clingmans Dome | 7 | 1275 | 3.9 | 3.9 |
| Juney Whank Falls | Great Smoky Mountains | Cherokee / Deep Creek | 1 | 194 | 0.2 | 0.2 |
| Kanati Fork Trail | Great Smoky Mountains | Cherokee / Deep Creek | 4 | 1495 | 3 | 3.0 |
| Kephart Prong Trail | Great Smoky Mountains | Cherokee / Deep Creek | 4 | 955 | 2.6 | 2.6 |
| Keyhole on Longs Peak | Rocky Mountain | Longs Peak | 12 | 3 | 7.7 | 7.7 |
| Kings Creek Falls | Lassen Volcanic | 3 | 500 | 1.44 | 1.4 | |
| Lake Creek-Woodland Trail Loop | Grand Teton | Phelps Lake | 3 | 260 | 1.2 | 1.2 |
| Lake Haiyaha | Rocky Mountain | Bear Lake Road | 4 | 865 | 2.6 | 2.6 |
| Lake Helene | Rocky Mountain | Bear Lake Road | 7 | 1 | 4.6 | 4.6 |
| Lake Irene | Rocky Mountain | Alpine Visitor Center | 1 | 95 | 0.1 | 0.1 |
| Lake McDonald West Shore | Glacier | Lake McDonald | 14 | 300 | 7 | 6.9 |
| Lake of the Clouds | Rocky Mountain | West Side | 14 | 2 | 9.9 | 9.9 |
| Lake Solitude | Grand Teton | Jenny Lake | 15 | 2350 | 6.9 | 6.9 |
| Lake Verna | Rocky Mountain | West Side | 14 | 1 | 9.1 | 9.1 |
| Lakeshore Trail | Grand Teton | Colter Bay | 2 | 150 | 0.7 | 0.7 |
| Landscape Arch? | Arches | Arches West | 2 | 200 | 5 | 5.0 |
| Lassen Peak | Lassen Volcanic | 5 | 700 | 6.16 | 6.2 | |
| Laurel Falls | Great Smoky Mountains | Elkmont | 2 | 314 | 1.2 | 1.2 |
| Lava Creek Trail | Yellowstone | Northwest Quadrant | 5 | 450 | 6.39 | 6.4 |
| Lawn Lake | Rocky Mountain | Estes Park | 12 | 2 | 9 | 9.0 |
| Leigh Lake | Grand Teton | Leigh Lake | 4 | 50 | 1.2 | 1.2 |
| Lembert Dome | Yosemite | Tioga Road | 3 | 900 | 6.55 | 6.6 |
| Lewis Channel Trail | Yellowstone | Southwest Quadrant | 6 | 1240 | 4.33 | 4.3 |
| Lily Lake Loop | Rocky Mountain | Longs Peak | 1 | 10 | 0 | 0.0 |
| Lily Mountain | Rocky Mountain | Longs Peak | 4 | 1 | 3 | 3.0 |
| Lily Pond Nature Trail Loop | Lassen Volcanic | 1 | 85 | 1.2 | 1.2 | |
| Lion Lake No. 1 | Rocky Mountain | Wild Basin | 14 | 2 | 10 | 10.0 |
| Little Brier Gap | Great Smoky Mountains | Elkmont | 3 | 285 | 1.3 | 1.3 |
| Little Nellie Falls | Yosemite | Hetch Hetchy and Big Oak Flat | 6 | 320 | 4.33 | 4.3 |
| Little River Trail | Great Smoky Mountains | Elkmont | 5 | 412 | 2.4 | 2.4 |
| Loma Verde | Saguaro | 2 | 120 | 1.2 | 1.2 | |
| Lone Pine Lake | Rocky Mountain | West Side | 11 | 1 | 7.3 | 7.3 |
| Lone Star Geyser?Basin Trail | Yellowstone | Upper Geyser Basin-Old Faithful Area | 3 | 540 | 1.19 | 1.2 |
| Lonesome Pine Overlook | Great Smoky Mountains | Cherokee / Deep Creek | 7 | 2300 | 5 | 5.0 |
| Longs Peak | Rocky Mountain | Longs Peak | 16 | 4 | 9.9 | 9.9 |
| Lookout Point | Yosemite | Hetch Hetchy and Big Oak Flat | 3 | 500 | 3.44 | 3.4 |
| Lost Lake Trail | Yellowstone | Tower-Roosevelt | 4 | 20 | 2.6 | 2.6 |
| Lower Gaylor Lake | Yosemite | Tioga Road | 5 | 800 | 3.2 | 3.2 |
| Lower Yosemite Falls | Yosemite | Yosemite Valley | 1 | 50 | 0.35 | 0.4 |
| Lukens Lake | Yosemite | Tioga Road | 2 | 200 | 2.54 | 2.5 |
| Lulu City Site | Rocky Mountain | West Side | 6 | 500 | 3.5 | 3.5 |
| Lumber Ridge Trail | Great Smoky Mountains | Cades Cove / Townsend | 8 | 1524 | 4.9 | 4.9 |
| Lumpy Ridge Loop | Rocky Mountain | Estes Park | 11 | 2 | 8.3 | 8.3 |
| Lunch Tree Hill | Grand Teton | Jackson Lake | 0 | 87 | 0.1 | 0.1 |
| Lyell Canyon | Yosemite | Tioga Road | 1 | 100 | 2.33 | 2.3 |
| Mallard Creek Trail | Yellowstone | Southwest Quadrant | 4 | 420 | 0.72 | 0.7 |
| Mallard Lake Trail | Yellowstone | Southwest Quadrant | 3 | 930 | 0.76 | 0.8 |
| Manzanita Creek | Lassen Volcanic | 7 | 530 | 6.35 | 6.4 | |
| Manzanita Lake | Lassen Volcanic | 2 | 100 | 2.74 | 2.7 | |
| Marion Lake (via Arial Tram) | Grand Teton | Teton Village | 13 | 3560 | 7 | 7.0 |
| Marion Lake (via Granite Canyon) | Grand Teton | Granite Canyon | 18 | 2900 | 8.3 | 8.3 |
| Marion Lake Loop | Grand Teton | Teton Village | 17 | 1525 | 6.8 | 6.8 |
| Mariposa Grove of Giant Sequoias | Yosemite | Southern Yosemite | 0 | 1 | 3.22 | 3.2 |
| Mary Mountain Trail | Yellowstone | Southwest Quadrant | 20 | 0 | 4.56 | 4.6 |
| Mary's Saddle | Grand Teton | Grand Targhee Resort | 5 | 500 | 2 | 5.5 |
| May Lake & Mt. Hoffmann | Yosemite | Tioga Road | 3 | 500 | 7.34 | 7.3 |
| McGurk Meadow | Yosemite | Glacier Point Road | 2 | 100 | 1.23 | 1.2 |
| Medicine Grizzly Lake | Glacier | Two Medicine? | 12 | 625 | 6.6 | 6.6 |
| Meigs Creek Trail | Great Smoky Mountains | Elkmont | 7 | 1380 | 4.3 | 4.3 |
| Meigs Mountain Trail | Great Smoky Mountains | Elkmont | 5 | 661 | 2.5 | 2.5 |
| Menors Ferry | Grand Teton | Moose Junction | 0 | 10 | 0 | 0.1 |
| Merced Grove of Giant Sequoias | Yosemite | Hetch Hetchy and Big Oak Flat | 3 | 600 | 4.77 | 4.8 |
| Mesquite | Saguaro | 1 | 0 | 0.5 | 0.5 | |
| Mica View | Saguaro | 1 | 40 | 0.5 | 0.5 | |
| Middle Prong Trail | Great Smoky Mountains | Cades Cove / Townsend | 8 | 1140 | 4.6 | 4.6 |
| Mill Creek Falls | Lassen Volcanic | 4 | 400 | 4.36 | 4.4 | |
| Miller Creak | Saguaro | 5 | 1 | 4.2 | 4.2 | |
| Mills Lake | Rocky Mountain | Bear Lake Road | 5 | 780 | 3.3 | 3.3 |
| Mingus Creek Trail | Great Smoky Mountains | Cherokee / Deep Creek | 6 | 1515 | 3.8 | 3.8 |
| Mirror Lake & Tenaya Canyon | Yosemite | Yosemite Valley | 2 | 100 | 2.3 | 2.3 |
| Mono Meadow | Yosemite | Glacier Point Road | 1 | 300 | 4.32 | 4.3 |
| Mono Pass | Yosemite | Tioga Road | 7 | 900 | 5.44 | 5.4 |
| Monument Geyser Basin | Yellowstone | Norris Geyser Basin Area | 3 | 300 | 6.88 | 6.9 |
| Moose Ponds | Grand Teton | Jenny Lake | 3 | 195 | 0.9 | 0.9 |
| Mount Harkness | Lassen Volcanic | 4 | 500 | 6.72 | 6.7 | |
| Mount Sheridan?Trail | Yellowstone | Southeast Quadrant | 7 | 0 | 0.9 | 0.9 |
| Mt. Brown Lookout | Glacier | Lake McDonald | 10 | 4250 | 9 | 9.0 |
| Mt. Cammerer | Great Smoky Mountains | Greenbrier / Cosby | 11 | 3045 | 7.6 | 7.6 |
| Mt. Glory | Grand Teton | Teton Pass | 2 | 1655 | 1.7 | 1.7 |
| Mt. Ida | Rocky Mountain | Alpine Visitor Center | 10 | 2465 | 7.5 | 7.5 |
| Mt. LeConte (Boulevard Trail) | Great Smoky Mountains | Newfound Gap / Clingmans Dome | 16 | 3000 | 9.6 | 9.6 |
| Mt. LeConte (Rainbow Falls) | Great Smoky Mountains | Gatlinburg / Mt. LeConte | 14 | 3993 | 9.7 | 9.7 |
| Mt. LeConte (via Alum Cave) | Great Smoky Mountains | Gatlinburg / Mt. LeConte | 11 | 2763 | 7.3 | 7.3 |
| Mt. LeConte (via Bullhead) | Great Smoky Mountains | Gatlinburg / Mt. LeConte | 14 | 3993 | 8.3 | 8.3 |
| Mt. LeConte (via Trillium Gap) | Great Smoky Mountains | Gatlinburg / Mt. LeConte | 14 | 3401 | 9.2 | 9.2 |
| Mt. Sterling (via Baxter Creek) | Great Smoky Mountains | Big Creek | 12 | 4200 | 9.2 | 9.2 |
| Mt. Sterling?(Mt. Sterling Gap) | Great Smoky Mountains | Big Creek | 6 | 2000 | 4.2 | 4.2 |
| Mud Volcano Trail | Yellowstone | Hayden Valley | 1 | 132 | 2.99 | 3.0 |
| Mystic Falls?Trail | Yellowstone | Upper Geyser Basin-Old Faithful Area | 1 | 240 | 2.18 | 2.2 |
| Nagoonberry Loop | Glacier Bay | Glacier Bay | 3 | 250 | 3.2 | 3.2 |
| Newton Bald | Great Smoky Mountains | Cherokee / Deep Creek | 10 | 2800 | 6.9 | 6.9 |
| No Name Lake | Glacier | Two Medicine? | 5 | 905 | 3.3 | 3.3 |
| Nobles Emigrant Trail | Lassen Volcanic | 4 | 15 | 3.15 | 3.2 | |
| Noland Divide | Great Smoky Mountains | Newfound Gap / Clingmans Dome | 7 | 1679 | 4.6 | 4.6 |
| North Dome | Yosemite | Tioga Road | 9 | -560 | 4.7 | 4.7 |
| Nymph Lake | Rocky Mountain | Bear Lake Road | 1 | 245 | 0.4 | 0.4 |
| Oconaluftee River Trail | Great Smoky Mountains | Cherokee / Deep Creek | 3 | 70 | 1.2 | 1.2 |
| Odessa Lake (via Bear Lake) | Rocky Mountain | Bear Lake Road | 9 | 1 | 6.5 | 6.5 |
| Odessa Lake (via Fern Lake TH) | Rocky Mountain | Estes Park | 10 | 1 | 6.8 | 6.8 |
| Old Settlers Trail (Maddron Bald) | Great Smoky Mountains | Greenbrier / Cosby | 9 | 1650 | 5.3 | 5.3 |
| Oldman Lake | Glacier | Two Medicine? | 13 | 1850 | 8.2 | 8.2 |
| Olmsted Point | Yosemite | Tioga Road | 0 | 100 | 1.4 | 1.4 |
| Ostrander Lake | Yosemite | Glacier Point Road | 12 | 1 | 7.38 | 7.4 |
| Otokomi Lake | Glacier | St. Mary Lake | 11 | 2180 | 7.3 | 7.3 |
| Ouzel Falls | Rocky Mountain | Wild Basin | 5 | 870 | 3.5 | 3.5 |
| Ouzel Lake | Rocky Mountain | Wild Basin | 10 | 1 | 7 | 7.0 |
| Paintbrush-Cascade Loop | Grand Teton | Jenny Lake | 19 | 4350 | 9.7 | 9.7 |
| Panorama Trail | Yosemite | Glacier Point Road | 9 | 3 | 7.23 | 7.2 |
| Paradise Point | Glacier | Two Medicine? | 1 | 220 | 0.6 | 0.6 |
| Parika Lake | Rocky Mountain | West Side | 11 | 2 | 8.4 | 8.4 |
| Park Avenue? | Arches | arches west | 1 | 20 | 3 | 3.0 |
| PCT | Lassen Volcanic | 18 | 2500 | 9.89 | 9.9 | |
| Peak 12,150 | Rocky Mountain | Alpine Visitor Center | 6 | 1410 | 4.2 | 4.2 |
| Pear Lake | Rocky Mountain | Wild Basin | 13 | 2 | 9.4 | 9.4 |
| Pebble Creek Trail | Yellowstone | Northeast Quadrant | 12 | 2400 | 0.16 | 0.2 |
| Pelican Creek Nature Trail | Yellowstone | Yellowstone Lake | 1 | 0 | 9.06 | 9.1 |
| Phelps Lake | Grand Teton | Death Canyon | 5 | 965 | 2.2 | 2.2 |
| Phelps Lake Loop | Grand Teton | Phelps Lake | 7 | 475 | 2.7 | 2.7 |
| Phelps Lake Overlook | Grand Teton | Death Canyon | 2 | 395 | 0.8 | 0.8 |
| Piegan Pass | Glacier | Logan Pass | 9 | 1850 | 6.2 | 6.2 |
| Pink Hill | Saguaro | 2 | 0 | 0.9 | 0.9 | |
| Pitamakan Pass | Glacier | Two Medicine? | 15 | 2500 | 9.9 | 9.9 |
| Plane Crash Hike | Glacier Bay | Glacier Bay | 1 | 50 | 0.5 | 0.5 |
| Pohono Trail | Yosemite | Yosemite Valley | 13 | 3 | 8.54 | 8.5 |
| Poia Lake | Glacier | Many Glacier | 9 | 1750 | 5.8 | 5.8 |
| Polecat Creek Loop Trail | Grand Teton | Flagg Ranch | 3 | 80 | 0.8 | 0.8 |
| Porters Creek Trail | Great Smoky Mountains | Greenbrier / Cosby | 4 | 699 | 2.3 | 2.3 |
| Pothole Dome & Tuolumne River | Yosemite | Tioga Road | 3 | 250 | 2.43 | 2.4 |
| Poudre River Trail | Rocky Mountain | Alpine Visitor Center | 6 | 475 | 3.3 | 3.3 |
| Preston Park | Glacier | Logan Pass | 7 | 1415 | 4.7 | 5.4 |
| Prospect Peak | Lassen Volcanic | 7 | 1800 | 9.74 | 9.7 | |
| Ptarmigan Falls | Glacier | Many Glacier | 5 | 768 | 3 | 3.0 |
| Ptarmigan Lake | Glacier | Many Glacier | 9 | 1700 | 5.8 | 5.8 |
| Ptarmigan Tunnel | Glacier | Many Glacier | 11 | 2300 | 7.4 | 7.4 |
| Purple Mountain Trail | Yellowstone | Madison River | 6 | 600 | 3.29 | 3.3 |
| Quartz Lake Loop | Glacier | Lake McDonald | 13 | 2350 | 8.5 | 8.5 |
| Rainbow Falls | Great Smoky Mountains | Gatlinburg / Mt. LeConte | 5 | 1685 | 3.8 | 3.8 |
| Ramsey Cascades | Great Smoky Mountains | Greenbrier / Cosby | 8 | 2190 | 5.4 | 5.4 |
| Rancheria Falls | Yosemite | Hetch Hetchy and Big Oak Flat | 13 | 800 | 8.43 | 8.4 |
| Red Eagle Lake | Glacier | St. Mary Lake | 15 | 300 | 7.5 | 7.5 |
| Redrock Falls | Glacier | Many Glacier | 4 | 285 | 2.1 | 2.1 |
| Rescue Creek Trail | Yellowstone | Northwest Quadrant | 8 | 2430 | 7.75 | 7.8 |
| Rich Mountain Loop | Great Smoky Mountains | Cades Cove / Townsend | 9 | 1736 | 5.3 | 5.3 |
| Ridge Lakes | Lassen Volcanic | 2 | 1400 | 8.43 | 8.4 | |
| Ridge View | Saguaro | 1 | 150 | 0.6 | 0.6 | |
| Rincon Peak | Saguaro | 3 | 2 | 3.9 | 3.9 | |
| Rockwell Falls | Glacier | Two Medicine? | 7 | 375 | 3.6 | 3.6 |
| Rocky Point Nature Trail | Glacier | Lake McDonald | 2 | 350 | 1 | 1.0 |
| Rocky Top / Thunderhead | Great Smoky Mountains | Cades Cove / Townsend | 14 | 3665 | 9.5 | 9.5 |
| Rough Fork Trail | Great Smoky Mountains | Balsam Mountain | 5 | 600 | 2.7 | 2.7 |
| Running Eagle Falls | Glacier | Two Medicine? | 1 | 15 | 0 | 0.0 |
| Sand Dune Arch? | Arches | Arches West | 0 | 100 | 2.2 | 2.2 |
| Sandbeach Lake | Rocky Mountain | Wild Basin | 9 | 2 | 6.6 | 6.6 |
| Scalplock Mountain Lookout | Glacier | Two Medicine | 9 | 3175 | 7.6 | 7.6 |
| Scenic Point | Glacier | Two Medicine? | 8 | 2300 | 6 | 6.0 |
| Schoolhouse Gap | Great Smoky Mountains | Cades Cove / Townsend | 4 | 513 | 2 | 2.0 |
| Sentinel / Cook's Meadow Loop | Yosemite | Yosemite Valley | 2 | 10 | 1.52 | 1.5 |
| Sentinel Dome | Yosemite | Glacier Point Road | 2 | 400 | 2.4 | 2.4 |
| Shadow Mountain Lookout | Rocky Mountain | West Side | 10 | 1 | 6.6 | 6.6 |
| Shantz | Saguaro | 5 | 50 | 2.5 | 2.5 | |
| Shoshone Lake Trail | Yellowstone | Southwest Quadrant | 17 | 3380 | 4.66 | 4.7 |
| Shuckstack Fire Tower | Great Smoky Mountains | Fontana Village | 7 | 2120 | 4.9 | 4.9 |
| Sifford Lakes | Lassen Volcanic | 2 | 100 | 1.33 | 1.3 | |
| Signal Mountain | Grand Teton | Signal Mountain | 7 | 920 | 2.9 | 2.9 |
| Silers Bald | Great Smoky Mountains | Newfound Gap / Clingmans Dome | 9 | 2152 | 6 | 6.0 |
| Siyeh Pass | Glacier | Logan Pass | 9 | 2090 | 6.3 | 6.3 |
| Siyeh Pass Loop | Glacier | Logan Pass | 10 | 2280 | 7.2 | 7.2 |
| Sky Pond | Rocky Mountain | Bear Lake Road | 9 | 1 | 6.4 | 6.4 |
| Skyline Arch? | Arches | Arches South | 0 | 80 | 3 | 3.0 |
| Slough Creek Trail | Yellowstone | Northeast Quadrant | 22 | 0 | 1.31 | 1.3 |
| Smokemont Loop | Great Smoky Mountains | Cherokee / Deep Creek | 7 | 1441 | 4.1 | 4.1 |
| Snag Lake Loop | Lassen Volcanic | 13 | 300 | 7.23 | 7.2 | |
| Snow Creek Trail | Yosemite | Yosemite Valley | 7 | 2 | 8.43 | 8.4 |
| Snyder Lake | Glacier | Lake McDonald | 9 | 2045 | 6.1 | 6.1 |
| Solfatara Creek Trail | Yellowstone | Northwest Quadrant | 6 | 0 | 3.73 | 3.7 |
| South Fork Cascade Canyon? | Grand Teton | Jenny Lake | 21 | 3920 | 10 | 10.0 |
| Specimen Ridge?Trail | Yellowstone | Northeast Quadrant | 19 | 1880 | 8.34 | 8.3 |
| Spence / Russell Field Loop | Great Smoky Mountains | Cades Cove / Townsend | 13 | 3050 | 8.6 | 8.6 |
| Spence Field (Anthony Creek) | Great Smoky Mountains | Cades Cove / Townsend | 10 | 2842 | 7.1 | 7.1 |
| Spence Field (via Lead Cove) | Great Smoky Mountains | Cades Cove / Townsend | 9 | 3100 | 6.9 | 6.9 |
| Sperry Chalet | Glacier | Lake McDonald | 12 | 3360 | 9.3 | 9.3 |
| Spillway Lake | Yosemite | Tioga Road | 8 | 800 | 7.12 | 7.1 |
| Sportsman Lake Trail | Yellowstone | Northwest Quadrant | 23 | 2320 | 4.94 | 4.9 |
| Sprague Lake Loop | Rocky Mountain | Bear Lake Road | 1 | 10 | 0.1 | 0.1 |
| Spruce Lake | Rocky Mountain | Estes Park | 9 | 1 | 6.3 | 6.3 |
| Spruce-Fir Trail | Great Smoky Mountains | Newfound Gap / Clingmans Dome | 0 | 25 | 0.3 | 0.3 |
| Squeeze Pen | Saguaro | 2 | 80 | 1.2 | 1.2 | |
| St. Mary Area Waterfalls Hike | Glacier | St. Mary Lake | 5 | 700 | 3 | 3.0 |
| St. Mary Falls | Glacier | St. Mary Lake | 2 | 215 | 0.8 | 0.8 |
| Static Peak Divide | Grand Teton | Death Canyon | 16 | 5000 | 9.2 | 9.2 |
| String Lake Loop | Grand Teton | String Lake | 4 | 275 | 1.4 | 1.4 |
| Sugarland Mtn Trail (lower) | Great Smoky Mountains | Elkmont | 6 | 1500 | 3.9 | 3.9 |
| Sugarland Mtn Trail (upper) | Great Smoky Mountains | Newfound Gap / Clingmans Dome | 7 | 1090 | 4 | 4.0 |
| Summit Lake to Cluster/Twin Lakes Loop | Lassen Volcanic | 11 | 550 | 6.33 | 6.3 | |
| Summit Lake Trail | Yellowstone | Southwest Quadrant | 16 | 0 | 9.32 | 9.3 |
| Sunrise Lakes | Yosemite | Tioga Road | 9 | 1 | 6.44 | 6.4 |
| Swiftcurrent Lake Nature Trail | Glacier | Many Glacier | 3 | 25 | 1.2 | 1.2 |
| Swiftcurrent Pass | Glacier | Many Glacier | 14 | 2400 | 9.2 | 9.2 |
| Table Mountain | Grand Teton | Teton Canyon | 12 | 4100 | 7 | 7.0 |
| Taft Point and the Fissures | Yosemite | Glacier Point Road | 2 | 200 | 2.4 | 2.4 |
| Taggart Lake | Grand Teton | Taggart Lake | 3 | 300 | 1.2 | 1.2 |
| Taggart Lake-Beaver Creek Loop | Grand Teton | Taggart Lake | 4 | 425 | 1.5 | 1.5 |
| Taggart Lake-Bradley Lake Loop | Grand Teton | Taggart Lake | 6 | 585 | 2.2 | 2.2 |
| Tanque verde Ridge | Saguaro | 11 | 3 | 9.4 | 9.4 | |
| Tenaya Lake | Yosemite | Tioga Road | 3 | 0 | 2.3 | 2.3 |
| Terminal Geyser | Lassen Volcanic | 6 | 400 | 4.32 | 4.3 | |
| Terrace, Shadow, and Cliff Lakes | Lassen Volcanic | 4 | 400 | 1.44 | 1.4 | |
| The Loch | Rocky Mountain | Bear Lake Road | 6 | 1 | 3.8 | 3.8 |
| The Mist Trail (Vernal & Nevada Falls) | Yosemite | Yosemite Valley | 3 | 1 | 6.3 | 6.3 |
| The Pool | Rocky Mountain | Estes Park | 3 | 205 | 1.6 | 1.6 |
| The Windows? | Arches | Arches North | 1 | 400 | 6 | 6.0 |
| Thunder Lake | Rocky Mountain | Wild Basin | 12 | 2 | 8.4 | 8.4 |
| Timber Lake | Rocky Mountain | West Side | 10 | 2 | 7.1 | 7.1 |
| Timberline Falls | Rocky Mountain | Bear Lake Road | 8 | 1 | 5.6 | 5.6 |
| Toms Branch Falls | Great Smoky Mountains | Cherokee / Deep Creek | 1 | 47 | 0.1 | 0.1 |
| Tower Arch? | Arches | Arches South | 3 | 300 | 5 | 5.0 |
| Tower Fall Trail | Yellowstone | Tower-Roosevelt | 1 | 200 | 2.21 | 2.2 |
| Trail of the Cedars | Glacier | Lake McDonald | 1 | 60 | 0.2 | 0.2 |
| Trout Lake | Glacier | Lake McDonald | 8 | 4200 | 8.1 | 7.9 |
| Tundra Communities Trail | Rocky Mountain | Alpine Visitor Center | 1 | 175 | 0.3 | 0.3 |
| Tuolumne Grove of Giant Sequoias | Yosemite | Tioga Road | 3 | -400 | 2.33 | 2.3 |
| Tuolumne Meadows | Yosemite | Tioga Road | 2 | 0 | 2.1 | 2.1 |
| Turkey Creek | Saguaro | 6 | 2 | 5 | 5.0 | |
| Turtleback Dome | Yosemite | Yosemite Valley | 1 | 360 | 3.2 | 3.2 |
| Twentymile Loop | Great Smoky Mountains | Fontana Village | 8 | 900 | 4 | 4.0 |
| Twin Falls | Glacier | Two Medicine? | 2 | 115 | 1 | 1.0 |
| Twin Sisters Peak | Rocky Mountain | Longs Peak | 7 | 2 | 6.1 | 6.1 |
| Two Medicine Pass | Glacier | Two Medicine? | 16 | 2350 | 10 | 10.0 |
| Two Ocean & Emma Matilda Lakes (Inside Loop) | Grand Teton | Two Ocean | 9 | 1175 | 4 | 4.0 |
| Two Ocean & Emma Matilda Lakes (Outside Loop) | Grand Teton | Two Ocean | 14 | 965 | 5.4 | 5.4 |
| Two Ocean Lake Loop | Grand Teton | Two Ocean | 7 | 150 | 2.3 | 2.3 |
| Uncle Tom's Trail | Yellowstone | Canyon | 1 | -500 | 3.31 | 3.3 |
| Upper Beaver Meadows Loop | Rocky Mountain | Estes Park | 5 | 935 | 3.3 | 3.3 |
| Upper Geyser Basin Trail | Yellowstone | Upper Geyser Basin-Old Faithful Area | 2 | 150 | 1.08 | 1.1 |
| Upper Two Medicine Lake | Glacier | Two Medicine? | 5 | 350 | 2.5 | 2.5 |
| Upper Yosemite Falls | Yosemite | Yosemite Valley | 8 | 2 | 9.23 | 9.2 |
| Ute Trail | Rocky Mountain | Alpine Visitor Center | 4 | 405 | 2.2 | 2.3 |
| Vernal Fall Footbridge | Yosemite | Yosemite Valley | 2 | 300 | 4.23 | 4.2 |
| Virginia Falls | Glacier | St. Mary Lake | 4 | 525 | 2 | 2.0 |
| Wapama Falls | Yosemite | Hetch Hetchy and Big Oak Flat | 6 | 200 | 5.43 | 5.4 |
| Washburn Point | Yosemite | Glacier Point Road | 0 | 15 | 0.1 | 0.1 |
| Waterfall Hike | Glacier Bay | Glacier Bay | 4 | 750 | 7 | 7.0 |
| Wawona Meadow Loop | Yosemite | Southern Yosemite | 4 | 50 | 2.52 | 2.5 |
| Wawona Swinging Bridge | Yosemite | Southern Yosemite | 1 | 50 | 1.32 | 1.3 |
| Wentworth | Saguaro | 3 | 100 | 1.8 | 1.8 | |
| West Prong Trail | Great Smoky Mountains | Cades Cove / Townsend | 5 | 1375 | 3.5 | 3.5 |
| West Thumb Trail | Yellowstone | West Thumb Geyser | 1 | 150 | 5.46 | 5.5 |
| Westfall Meadow | Yosemite | Glacier Point Road | 3 | 100 | 2.1 | 2.1 |
| Wolf Lake Trail | Yellowstone | Northwest Quadrant | 5 | 1410 | 9.88 | 9.9 |
| Wraith Falls | Yellowstone | Mammoth Hot Springs | 1 | 100 | 8.49 | 8.5 |
| Yellowstone River Picnic Area Trail | Yellowstone | Tower-Roosevelt | 1 | 240 | 1.33 | 1.3 |
| Yellowstone River Picnic Trail | Yellowstone | Northeast Quadrant | 4 | 380 | 9.92 | 9.9 |
| Yellowstone River Trail-Black Canyon | Yellowstone | Northwest Quadrant | 19 | 0 | 7.22 | 7.2 |
| Ypsilon Lake | Rocky Mountain | Estes Park | 9 | 2 | 6.8 | 6.8 |