| "The Saddle" trail | | Rocky Mountain National Park | Estes Park | CO | hike |
| 12 Mile | | Centennial | Centennial | CO | mtb |
| 12 Mile (Access) | | Centennial | Centennial | CO | mtb |
| 12 Mile Connector | | Centennial | Centennial | CO | mtb |
| 12 Mile Connector | | Centennial | Centennial | CO | mtb |
| 120A | | Hermit Park Open Space | Estes Park | CO | mtb |
| 120th Avenue MUP | | McKay Lake | Broomfield | CO | mtb |
| 123 | | Pilot Hill/The Schoolyard | Laramie | WY | |
| 2 Percent | | Curt Gowdy State Park | Cheyenne | WY | |
| 3 Crowns Trail | | Casper | Casper | WY | mtb |
| 3 Crowns Trail | | Casper | Casper | WY | mtb |
| 610C | | Laramie Peak | Douglas | WY | mtb |
| 6th Street Connector | | Boulder Open Space | Boulder | CO | hike |
| 700BB | | Vedauwoo / Blair | Laramie | WY | mtb |
| 700DA - an abandoned road bed | | Vedauwoo / Blair | Laramie | WY | |
| 707A | | Vedauwoo / Blair | Laramie | WY | mtb |
| 707AD | | Vedauwoo / Blair | Laramie | WY | mtb |
| 707AG | | Vedauwoo / Blair | Laramie | WY | mtb |
| 91 Gigawatt | | Glendo State Park | Glendo | WY | |
| ABC | | Pilot Hill/The Schoolyard | Laramie | WY | |
| Access Road | | Erie Singletrack | Erie | CO | mtb |
| Access Trail | | Squaw Creek | Casper | WY | mtb |
| Acquarius Link | | Erie | Erie | CO | mtb |
| Adrian | | Fort Collins | Fort Collins | CO | hike |
| Albert's Alley | | Curt Gowdy State Park | Cheyenne | WY | |
| Alder | | Happy Jack Recreational Area | Laramie | WY | |
| Alluvial Fan | | Rocky Mountain National Park | Estes Park | CO | hike |
| Anemone | | The People's Crossing Park | Boulder | CO | hike |
| Anne U White Trail | | Boulder | Boulder | CO | hike |
| Antelope | | Hall Ranch | Lyons | CO | mtb |
| Arapaho Bend Paved | | Arapaho Bend Natural Area | Fort Collins | CO | hike |
| Arrowhead | | Glendo State Park | Glendo | WY | |
| Arrowhead Two-Track | | Glendo State Park | Glendo | WY | |
| Arthur's Rock | | Lory State Park | Fort Collins | CO | hike |
| Aspen | | Happy Jack Recreational Area | Laramie | WY | |
| Aspen | | Muddy Mountain | Casper | WY | |
| Aspen Alley | | Curt Gowdy State Park | Cheyenne | WY | mtb |
| Aspen Brook | | Rocky Mountain National Park | Estes Park | CO | hike |
| Aspen-Haunted Connector | | Happy Jack Recreational Area | Laramie | WY | |
| Audra Culver | | Horsetooth Mountain | Fort Collins | CO | mtb |
| Aurora Reservoir | | Aurora Reservoir | Aurora | CO | mtb |
| Aurora Reservoir | | Aurora Reservoir | Aurora | CO | mtb |
| Aurora Reservoir (Access) | | Aurora Reservoir | Aurora | CO | mtb |
| Aurora Reservoir (Connect) | | Aurora Reservoir | Aurora | CO | mtb |
| B-17 Crash Spur | | Comanche Peak Wilderness Area | Roosevelt National Forest | CO | hike |
| Balanced Rock Trail | | Rocky Mountain National Park | Estes Park | CO | hike |
| Baldwin Gulch | | Parker | Parker | CO | mtb |
| Barber Lake Trail | | Snowies | Centennial | WY | |
| Barrel Roll | | Glendo State Park | Glendo | WY | |
| Baseline Trail | | Boulder Open Space | Boulder | CO | hike |
| Bass Pond Loop | | Arapaho Bend Natural Area | Fort Collins | CO | hike |
| Batman Rock Climb Access | | Rocky Mountain National Park | Estes Park | CO | hike |
| Baughman's Gulley #842 | | Lefthand OHV | Boulder | CO | mtb |
| Bay View trail | | Guernsey State Park | Guernsey | WY | hike |
| Bear Lake | | Rocky Mountain National Park | Estes Park | CO | hike |
| Beaver Creek Trail | | Comanche Peak Wilderness Area | Roosevelt National Forest | CO | hike |
| Beaver Meadows | | Rocky Mountain National Park | Estes Park | CO | hike |
| Beaver Mountain | | Rocky Mountain National Park | Estes Park | CO | hike |
| Beaver Pecker | | Beaver Meadows Resort Ranch | Red Feather Lakes | CO | mtb |
| Beaver Point (East) | | Rocky Mountain National Park | Estes Park | CO | hike |
| Beaver Point (West) | | Rocky Mountain National Park | Estes Park | CO | hike |
| Beaver Pond | | Arapaho Bend Natural Area | Fort Collins | CO | hike |
| Beaver Pond Overlook | | Muddy Mountain | Casper | WY | |
| Beehive Access | | Happy Jack Recreational Area | Laramie | WY | |
| Bent Rock | | Red Mountain - Soapstone Prairie | Fort Collins | CO | hike |
| Bermsville | | North Cheyenne Community Park | Cheyenne | WY | mtb |
| Besant Point Trail | | Pinewood Reservoir | Loveland | CO | hike |
| Bible Point Trail | | Estes Park | Estes Park | CO | |
| Bierstadt Lake | | Estes Park | Estes Park | CO | hike |
| Bierstadt Lake Loop | | Rocky Mountain National Park | Estes Park | CO | hike |
| Big Bear ORV | | Laramie Peak | Douglas | WY | mtb |
| Big Dry Creek | | Erie | Erie | CO | mtb |
| Big Dry Creek (Standley Lake) | | Standley Lake | Westminster | CO | |
| Big Hole Wash | | Red Mountain - Soapstone Prairie | Fort Collins | CO | |
| Big South Trail #944 | | Comanche Peak Wilderness Area | Roosevelt National Forest | CO | hike |
| Big Thompson | | Rocky Mountain National Park | Estes Park | CO | hike |
| Big Thompson South | | Rocky Mountain National Park | Estes Park | CO | hike |
| Black Canyon Trail | | Rocky Mountain National Park | Estes Park | CO | hike |
| Black Line | | Erie Singletrack | Erie | CO | mtb |
| Blackjack | | Happy Jack Recreational Area | Laramie | WY | |
| Blackjack Loop 1 | | Happy Jack Recreational Area | Laramie | WY | |
| Blackjack Loop 2 | | Happy Jack Recreational Area | Laramie | WY | |
| Blair Trail | | Vedauwoo / Blair | Laramie | WY | |
| Blue Line | | Erie Singletrack | Erie | CO | mtb |
| Blue Line Access | | Erie | Erie | CO | mtb |
| Blue Sky | | Coyote Ridge | Loveland | CO | mtb |
| Blue Sky | | Coyote Ridge | Loveland | CO | mtb |
| Blue Sky | | Coyote Ridge | Loveland | CO | mtb |
| Blue Sky | | Coyote Ridge | Loveland | CO | mtb |
| Blue Sky | | Coyote Ridge | Loveland | CO | mtb |
| Bluebird | | Pilot Hill/The Schoolyard | Laramie | WY | |
| Bluebird Road | | Boulder Open Space | Boulder | CO | hike |
| Blues Cruz | | Curt Gowdy State Park | Cheyenne | WY | |
| Bobcat Ridge | | Bobcat Ridge | Loveland | CO | mtb |
| Bohn Park | | Lyons | Lyons | CO | mtb |
| Bon Scott | | Lefthand OHV | Boulder | CO | mtb |
| Bone Collector | | Curt Gowdy State Park | Cheyenne | WY | mtb |
| Book Area Climbing Access | | Rocky Mountain National Park | Estes Park | CO | hike |
| Boulder Creek | | Boulder | Boulder | CO | |
| Boulder Reservoir Trail | | Boulder Valley Ranch / Boulder Reservoir | Boulder | CO | |
| Brackenbury Cabin Trail | | Comanche Peak Wilderness Area | Roosevelt National Forest | CO | hike |
| Braly Connector | | Pella Crossing | Longmont | CO | mtb |
| Braly Lot Connector | | Pella Crossing | Longmont | CO | mtb |
| Braly Trail | | Pella Crossing | Longmont | CO | mtb |
| Bridle Trail - Lower Parking to Trailhead | | Bridle Trail | Casper | WY | mtb |
| Bridle Trail - Split Rock | | Bridle Trail | Casper | WY | hike |
| Bridle Trail Entrance | | Bridle Trail | Casper | WY | |
| Bright #921 | | Taylor Mountain | Allenspark | CO | hike |
| Bright Extension #921.1 | | Boulder County | | CO | hike |
| Brimmer Point Loop | | Guernsey State Park | Guernsey | WY | hike |
| Brimmer Point Trail | | Guernsey State Park | Guernsey | WY | hike |
| Broke Bike Mountain | | Curt Gowdy State Park | Cheyenne | WY | mtb |
| Broken Bow | | Glendo State Park | Glendo | WY | |
| Brook Trail | | Rocky Mountain National Park | Estes Park | CO | hike |
| Broomfield Trail | | Broomfield | Broomfield | CO | |
| Browns Lake #941 | | Comanche Peak Wilderness Area | Roosevelt National Forest | CO | hike |
| Browns Landing | | Happy Jack Recreational Area | Laramie | WY | |
| Buck Creek | | Rocky Mountain National Park | Estes Park | CO | hike |
| Buckskin | | Beaver Meadows Resort Ranch | Red Feather Lakes | CO | mtb |
| Buckskin Access | | Beaver Meadows Resort Ranch | Red Feather Lakes | CO | mtb |
| Buffalo Run | | Glendo State Park | Glendo | WY | |
| Bulwark Ridge Trail #928.1 | | Crosier Mountain | Estes Park | CO | hike |
| Button Rock (East) | | Hall Ranch | Lyons | CO | hike |
| Button Rock (Road) | | Hall Ranch | Lyons | CO | hike |
| Button Rock (West) | | Hall Ranch | Lyons | CO | hike |
| Button Rock Access Road | | Hall Ranch | Lyons | CO | hike |
| Button Rock B Road #118.1 | | Pinewood Springs | Pinewood Springs | CO | |
| Button Rock Loop | | Lyons | Lyons | CO | mtb |
| C-470 | | Parker | Parker | CO | |
| Cabin Creek | | Beaver Meadows Resort Ranch | Red Feather Lakes | CO | mtb |
| Cabin Creek (Fire Route 392) | | Beaver Meadows Resort Ranch | Red Feather Lakes | CO | mtb |
| Cabin Run | | Red Feather Lakes Trails | Red Feather Lakes | CO | mtb |
| Camp Loop | | Snowies | Centennial | WY | |
| Campground By-Pass | | Happy Jack Recreational Area | Laramie | WY | |
| Cannon Mountain Road #254.1 | | Ceran Saint Vrain | Jamestown | CO | mtb |
| Cannon Mountain Spur Road 254.1F | | Ceran Saint Vrain | Jamestown | CO | mtb |
| Canyon Connector | | Red Mountain - Soapstone Prairie | Fort Collins | CO | |
| Canyon Trail | | Red Mountain - Soapstone Prairie | Fort Collins | CO | |
| Canyons | | Curt Gowdy State Park | Cheyenne | WY | |
| Canyons | | Curt Gowdy State Park | Cheyenne | WY | |
| Canyons | | Curt Gowdy State Park | Cheyenne | WY | |
| Canyons | | Curt Gowdy State Park | Cheyenne | WY | |
| Canyons (Shore) | | Curt Gowdy State Park | Cheyenne | WY | |
| Carey Springs | | Horsetooth Mountain | Fort Collins | CO | mtb |
| Casper Mountain Road to WYO BLVD Pathway | | Casper | Casper | WY | mtb |
| Casper Mountain Trail - To Rail Tail connection | | Casper | Casper | WY | mtb |
| Casper Mountain Trail - To Rail Tail connection | | Casper | Casper | WY | mtb |
| Casper Rail Trail | | Casper | Casper | WY | mtb |
| Castle Cutoff 843.1A | | Lefthand OHV | Boulder | CO | mtb |
| Castle Cutoff (Wrong Turn) #843 | | Lefthand OHV | Boulder | CO | mtb |
| Castle Gulch Spur (Start the Party) 287.1B | | Lefthand OHV | Boulder | CO | mtb |
| Cedar | | Glendo State Park | Glendo | WY | |
| CH13 Trailhead | | Windsor | Windsor | CO | |
| Chapin Creek Trail | | Rocky Mountain National Park | Estes Park | CO | hike |
| Chapin Pass Trail | | Rocky Mountain National Park | Estes Park | CO | hike |
| Chapin Pass Trail - Lower Fork | | Rocky Mountain National Park | Estes Park | CO | hike |
| Chautauqua | | Boulder Open Space | Boulder | CO | hike |
| Chautauqua | | Boulder Open Space | Boulder | CO | hike |
| Cherry Creek | | South Table Mountain Park | Golden | CO | |
| Cherry Creek | | Centennial | Centennial | CO | mtb |
| Cherry Creek (Parker) | | Centennial | Centennial | CO | mtb |
| Cherry Creek Spillway | | Aurora | Aurora | CO | mtb |
| Cheyenne Greenway | | North Cheyenne Community Park | Cheyenne | WY | mtb |
| Cheyenne Rim | | Red Mountain - Soapstone Prairie | Fort Collins | CO | |
| Cheyenne Rim (Lower) | | Red Mountain - Soapstone Prairie | Fort Collins | CO | |
| Cheyenne Rim Road | | Red Mountain - Soapstone Prairie | Fort Collins | CO | |
| Chiquita Mountain Bypass | | Rocky Mountain National Park | Estes Park | CO | hike |
| Church Ditch | | Standley Lake | Westminster | CO | |
| Cirrus Sky Path | | Laramie | Laramie | WY | |
| Clear Creek (East) | | Golden Bike Park | Golden | CO | |
| Clear Creek (West) | | Golden Bike Park | Golden | CO | |
| Clear Creek Access | | Broomfield | Broomfield | CO | mtb |
| Clear Lake | | Troublesome | Granby | CO | hike |
| Cliff Hanger | | Curt Gowdy State Park | Cheyenne | WY | |
| Cliffnotes Trail | | Pilot Hill/The Schoolyard | Laramie | WY | mtb |
| Clockwise | | Duncan Ranch | Glenrock | WY | mtb |
| Coal Creek Bridge | | Erie | Erie | CO | mtb |
| Coal Creek Cutoff | | Erie | Erie | CO | mtb |
| Coal Creek Trail | | Louisville | Louisville | CO | |
| Coal Seam | | Marshall Mesa/Doudy Draw/Flatirons Vista | Boulder | CO | |
| Coalton | | Marshall Mesa/Doudy Draw/Flatirons Vista | Boulder | CO | |
| Cobalt | | Boulder Valley Ranch / Boulder Reservoir | Boulder | CO | hike |
| Cobblestone | | Glendo State Park | Glendo | WY | |
| Columbine Ridge | | Red Feather Lakes Trails | Red Feather Lakes | CO | mtb |
| Columbine Ridge Loop | | Red Feather Lakes Trails | Red Feather Lakes | CO | mtb |
| Columbine Trail | | Red Feather Lakes Trails | Red Feather Lakes | CO | mtb |
| Columbine Trail | | Red Feather Lakes Trails | Red Feather Lakes | CO | mtb |
| Comanche Lake #990 | | Roosevelt National Forest | Fort Collins | CO | hike |
| Commerce City Trail | | McKay Lake | Broomfield | CO | mtb |
| Community Ditch - East | | Marshall Mesa/Doudy Draw/Flatirons Vista | Boulder | CO | |
| Connect | | Bobcat Ridge | Loveland | CO | mtb |
| Connector | | Reservoir Ridge | Fort Collins | CO | mtb |
| Connector A | | Muddy Mountain | Casper | WY | |
| Connector C | | Muddy Mountain | Casper | WY | |
| Connector D | | Muddy Mountain | Casper | WY | |
| Connector E | | Muddy Mountain | Casper | WY | |
| Connector f | | Muddy Mountain | Casper | WY | |
| Connector G | | Muddy Mountain | Casper | WY | |
| Conservatory West | | Aurora | Aurora | CO | mtb |
| Copper | | Casper Mountain Trails Center | Casper | WY | |