| 'Ol Orchard Campground Loop | Moraine View State Park | | |
| 318 West and Miller Creek Loop | Thumb Butte | | |
| 5 Mile Harlow Lake Route | Harlow Lake | | |
| A Loop | Spring Lake Park | | |
| A'a Trail | Sunset Crater National Monument | | |
| Abbott Loop | Danby State Forest | | |
| Abineau Canyon | San Francisco Peaks | | |
| Abyss Lake | Mount Evans Wilderness Area | | |
| Acer Summit via Mormon Trail | South Mountain Preserve | | |
| Adams Canyon Lower Falls | Northern Utah | | |
| Adero Canyon Ridgeline Trail | Fountain Hills | | |
| Ag Pass Loop | Shelbyville | | |
| Agua Caliente Hill Trail | Pusch Ridge Wilderness | | |
| Ajax Peak | Telluride | | |
| Ajo Mountain Drive | Organ Pipe Cactus National Monument | | |
| Alberta Falls | Rocky Mountain National Park | | |
| Alice Eastwood Route | Mount Tamalpais State Park | | |
| Allan Lake | State Line - Divide | | |
| Allerton Red Loop | Robert Allerton Park | | |
| Alpine and Sawtooth Lakes | Stanley | | |
| Alpine Mine Overlook | Ouray | | |
| American Lake | Maroon Bells - Snowmass Wilderness Area | | |
| Anderson and Petroleum Lakes | Aspen-Sopris Ranger District | | |
| Anderson Lake-Scotts Lake Loop | Flat Tops Wilderness | | |
| Anderson Mesa | Walnut Canyon | | |
| Andrew Kinsey Trail | Fountain Hills | | |
| Andrews Glacier | Rocky Mountain National Park | | |
| Angel's Staircase | Angels Staircase / Uno Peak | | |
| Annette Lake Out & Back | Snoqualmie Pass | | |
| Antelope Canyon | Lake Powell Navajo Tribal Park | | |
| Antelope Creek | Lake Powell Navajo Tribal Park | | |
| Antelope House Loop | Canyon de Chelly National Monument | | |
| Anthony’s Nose via Camp Smith Trail | Hudson Highlands State Park | | |
| Apache Fire House Trail | Red Rock State Park | | |
| Ape Canyon Trail | Southwestern Washington | | |
| Ape Cave Trail | Southwestern Washington | | |
| Apgar Lookout Trail | Glacier National Park | | |
| Appalachian Trail to Anthony's Nose | Hudson Highlands State Park | | |
| Arapaho Glacier | Indian Peaks Wilderness | | |
| Arch Canyon Trail | Organ Pipe Cactus National Monument | | |
| Archaeology Trail Out-and-Back | Zion National Park | | |
| Argentine Pass | Dillon Ranger District | | |
| Arizona Trail Passage 36: Coconino Rim | Kaibab National Forest (Tusayan District) | | |
| Arizona Trail Passage 37: Grand Canyon - South Rim | Kaibab National Forest (Tusayan District) | | |
| Arizona Trail Passage 41: Kaibab Plateau Central | Kaibab Plateau | | |
| Arizona Trail Passage 42: Kaibab Plateau North | Jacob Lake | | |
| Arizona Trail: Bike Passage 11c | Coronado National Forest - Mt Lemmon | | |
| Arizona Trail: Complete Route 2022 | Coronado National Memorial | | |
| Arizona Trail: Passage 1 - Huachuca Mountains | Coronado National Memorial | | |
| Arizona Trail: Passage 10 - Redington Pass | Tucson | | |
| Arizona Trail: Passage 11 - Santa Catalina Mountains | Pusch Ridge Wilderness | | |
| Arizona Trail: Passage 12 - Oracle Ridge | Coronado National Forest - Mt Lemmon | | |
| Arizona Trail: Passage 13 - Oracle | Oracle State Park | | |
| Arizona Trail: Passage 14 - Black Hills | Oracle State Park | | |
| Arizona Trail: Passage 15 - Tortilla Mountains | Tortilla Mountains | | |
| Arizona Trail: Passage 16 - Gila River Canyons | Kelvin | | |
| Arizona Trail: Passage 17 - Alamo Canyon | White Canyon Wilderness | | |
| Arizona Trail: Passage 18 - Reavis Canyon | Superior | | |
| Arizona Trail: Passage 19 - Superstition Wilderness | Superstition Wilderness | | |
| Arizona Trail: Passage 2 - Canelo Hills East | Parker Canyon Lake | | |
| Arizona Trail: Passage 20 - Four Peaks | Four Peaks Wilderness | | |
| Arizona Trail: Passage 21 - Pine Mountain | Sunflower | | |
| Arizona Trail: Passage 22 - Saddle Mountain | Mazatzal Wilderness | | |
| Arizona Trail: Passage 23 - Mazatzal Divide | Mazatzal Wilderness | | |
| Arizona Trail: Passage 24 - Red Hills | Mazatzal Wilderness | | |
| Arizona Trail: Passage 25 - Whiterock Mesa | Mazatzal Wilderness | | |
| Arizona Trail: Passage 26 - Highline | Pine | | |
| Arizona Trail: Passage 27 - Blue Ridge | Happy Jack | | |
| Arizona Trail: Passage 28 - Happy Jack | Cabin Loops | | |
| Arizona Trail: Passage 29 - Mormon Lake | Mormon Lake | | |
| Arizona Trail: Passage 3 - Canelo Hills West | Parker Canyon Lake | | |
| Arizona Trail: Passage 30 - Anderson Mesa | Mormon Lake | | |
| Arizona Trail: Passage 32 - Elden Mountain | Campbell Mesa Trail System | | |
| Arizona Trail: Passage 33 - Flagstaff Urban Route | Walnut Canyon | | |
| Arizona Trail: Passage 34 - San Francisco Peaks | MEDL (Mount Elden Dry Lakes) | | |
| Arizona Trail: Passage 35 - Babbitt Ranch | Flagstaff | | |
| Arizona Trail: Passage 38 - Grand Canyon - Inner Gorge | South Rim | | |
| Arizona Trail: Passage 39 - Grand Canyon - North Rim | North Rim | | |
| Arizona Trail: Passage 4 - Temporal Gulch | Patagonia | | |
| Arizona Trail: Passage 40 - Kaibab Plateau South | North Rim | | |
| Arizona Trail: Passage 43 - Buckskin Mountain | Buckskin Gulch | | |
| Arizona Trail: Passage 5 - Santa Rita Mountains | Coronado National Forest - Santa Rita Mountains | | |
| Arizona Trail: Passage 6 - Las Colinas | Coronado National Forest - Santa Rita Mountains | | |
| Arizona Trail: Passage 7 - Las Cienegas | Rincon Valley | | |
| Arizona Trail: Passage 8 - Rincon Valley | Rincon Valley | | |
| Arizona Trail: Passage 9 - Rincon Mountains | Saguaro National Park - Rincon Mountain District | | |
| Arkansas River Canyon Rim Trail | Royal Gorge Park | | |
| Armstrong - Dawns Loop | Park City Mountain Resort | | |
| Armstrong - Spiro Loop | Park City Mountain Resort | | |
| Armstrong, Mid-Mountain, CMG Loop | Park City Mountain Resort | | |
| Arnett Canyon Loop | Superior | | |
| Artists Pallette | Death Valley National Park | | |
| Ashford Canyon Road | Death Valley National Park | | |
| Aspen Loop | San Francisco Peaks | | |
| Aspen Nature Lollipop Loop | San Francisco Peaks | | |
| Aspen Trail | Navajo National Monument | | |
| Aspen Trail #93 | Pusch Ridge Wilderness | | |
| Aspen Trail and Marshall Gulch Loop Trail | Pusch Ridge Wilderness | | |
| Auger Falls Loop | Perkins Clearing and Speculator Tree Farm Conservation | | |
| Augspurger Mountain Trail | Carson | | |
| Augspurger Mountain: Dog and Cat Trail | Carson | | |
| Austin Bluffs Open Space Loop | Austin Bluffs | | |
| Avalanche Lake via Avalanche Campground | Glacier National Park | | |
| Azizona Trail: Passage 31 - Walnut Canyon | Walnut Canyon | | |
| AZT Bike Passage 1 | Coronado National Memorial | | |
| AZT Bike Passage 18-19 | Tonto NF - Apache Junction | | |
| AZT Bike Passage 20 | Tonto NF - Apache Junction | | |
| AZT Bike Passage 22-24 | Payson | | |
| AZT Bike Passage 25-26 | Payson | | |
| AZT Bike Passage B4 | Patagonia | | |
| AZT Bike Passage B8_9 | Saguaro National Park - Rincon Mountain District | | |
| Babat Duag Trail | Pusch Ridge Wilderness | | |
| Baby Rat Route | Spring Lake Park | | |
| Back Alley to Canyon Rim Point | Willow Springs | | |
| Badlands Loop | Death Valley National Park | | |
| Badwater Basin Salt Flats | Death Valley National Park | | |
| Baker Milton Trail Loop | Organ Pipe Cactus National Monument | | |
| Bald Mountain | Dillon Ranger District | | |
| Baldy Peak | Ouray | | |
| Balfour-Klickitat Loop | Mayer State Park | | |
| Ballard Mountain | Telluride | | |
| Ballyhack Preserve | Cornwall | | |
| Bareback Loop | Harlow Lake | | |
| Barnhardt Trail | Mazatzal Wilderness | | |
| Barnhardt Trail to Big Kahuna Falls | Mazatzal Wilderness | | |
| Barred Owl Route | Comlara Park | | |
| Batty Pass Caves | GSENM-Escalante Canyons | | |
| Bayview Hill Loop | San Francisco | | |
| Beacon Rock Trail | Beacon Rock State Park | | |
| Bear Canyon Lake Loop | Apache Sitgreaves National Forest | | |
| Bear Canyon to Seven Falls Trail | Pusch Ridge Wilderness | | |
| Bear Creek - Bridal Veil Loop | Telluride | | |
| Bear Jaw Abineau Loop | San Francisco Peaks | | |
| Bear Jaw to Weatherford Trailhead | San Francisco Peaks | | |
| Bear Lake | Rocky Mountain National Park | | |
| Bear Mountain | Dry Creek | | |
| Bear Peak | Boulder Open Space | | |
| Bear Peak from NCAR | Boulder Open Space | | |
| Bear Valley Lakes | Lemhi Mountains | | |
| Bear Wallow Spring | Pusch Ridge Wilderness | | |
| Beartrack Lakes | Mount Evans Wilderness Area | | |
| Beast of Burden | Little Shoals Tract (Beast of Burden) | | |
| Beaver Falls via Havasu Canyon Trail | Havasupai Tribal Area Wilderness | | |
| Beavor Loop | Big Shoals Conservation Area | | |
| Beckler Peak Trail | Skykomish | | |
| Belknap Range Trail | Belknap Range Trails | | |
| Bell Rock - Courthouse Butte Loop | Village of Oak Creek | | |
| Bell Rock Loop | Village of Oak Creek | | |
| Bell Rock Path | | | |
| Bell Rock Pathway - Big Park Loop | Village of Oak Creek | | |
| Bell Rock View | Village of Oak Creek | | |
| Bell Rock, Rector, and Big Park Loop | Village of Oak Creek | | |
| Ben Tyler Gulch | Lost Creek Wilderness Area | | |
| Bench and Snow Lakes Trail | Paradise | | |
| Benham Trail | Williams | | |
| Bernal Heights Park Tour | San Francisco | | |
| Betasso Preserve | Betasso Preserve | | |
| Betatakin Trail | Navajo National Monument | | |
| Bierstadt Lake | Rocky Mountain National Park | | |
| Big Blue Loop | Grand Mesa, Uncompahgre and Gunnison National Forests | | |
| Big Four Ice Caves | Snohomish County | | |
| Big Shoals Route | Big Shoals Conservation Area | | |
| Big Spring Lookout Trail | Kaibab Plateau | | |
| Big Willis Gulch | Twin Lakes | | |
| Big Yellow Route | Sand Ridge State Forest | | |
| Bigelow Pond Loop | Bigelow Hollow State Park & Nipmuck State Forest | | |
| Bighorn Canyon | GSENM-Escalante Canyons | | |
| Bighorn Creek Out-and-Back | Eagles Nest Wilderness Area | | |
| Bill Williams Mountain Trail | Williams | | |
| Bill Williams Trail to Clover Springs | Williams Valley Recreation Area | | |
| Birdsong Loop | Northern Utah | | |
| Birth of a Lake Trail | Coldwater Lake / Mt Margaret | | |
| Bitterroot Trail and Rowland Wall Trail Loop | Syncline Ridge | | |
| Bitterroot, Desert Parsley, and Atwood Road Loop | Syncline Ridge | | |
| Black Lake | Rocky Mountain National Park | | |
| Black Mountain | Northern Utah | | |
| Black Mountain Long Route | Northern Utah | | |
| Blackhawk Campground Loop | Northern Utah | | |
| Blackledge Falls Loop | Blackledge Falls | | |
| Blanca Lake Out & Back | Wild Sky Wilderness - Eagle Rock Unit | | |
| Bloods Lake | Park City | | |
| BLT Out-and-Back | Utah Olympic Park | | |
| Blue Forest | Petrified Forest National Park | | |
| Blue Lake | Lake Chelan National Rec. Area (North Cascades N.P.) | | |
| Blue Lake | West Mountains | | |
| Blue Lakes | Telluride | | |
| Blue Lakes from Yankee Boy Basin | Telluride | | |
| Blue Mesa Loop | Petrified Forest National Park | | |
| Blue Mtn. and Rain Shadow Loop | Port Angeles | | |
| Blue Ridge Cave Trail | Apache Sitgreaves National Forest | | |
| Blue Ridge Mountain Loop | White Mountain Trail System | | |
| Blue River Out-and-Back | Silverthorne | | |
| Blue-Green Loop | Sand Ridge State Forest | | |
| Bluebird Loop | Helen & Betty Bremer Wildlife Sanctuary | | |
| Bob Bear Trail to Fossil Creek Dam | Fossil Springs Wilderness | | |
| Bob Bear Trail, Toilet Bowl, Flume Trail | Fossil Springs Wilderness | | |
| Bog Spring to Kent Spring Loop | Coronado National Forest - Santa Rita Mountains | | |
| Bog Springs Trail | Coronado National Forest - Santa Rita Mountains | | |
| Boiler Creek Loop | Northwest | | |
| Bolinas Ridge - Cataract Loop | Mount Tamalpais State Park | | |
Trailforks