About trails in Boulder County, Colorado

Boulder County has 773 named trails on the map, covering 1,150 miles in total, an average of 1.5 miles per trail. That is the 1st largest mapped trail network among 54 counties in Colorado. 659 of them are tagged for hiking and 400 for mountain biking.

The longest single trail is Sourdough Trail, at 24.6 miles. 47 trails run 5 miles or longer. Mapped points of interest in the county include 79 trailheads, 82 campsites, 23 waterfalls, 12 boat launches, and 2 rapids. The nearest towns to these trails are Boulder, Allenspark, and Eldora.

What the trails in Boulder County are like

By length, 478 are under a mile, 239 run 1 to 5 miles, and 47 are 5 miles or longer. 34 are loops, ending where they start; the longest is Picture Rock Trail, at 10.4 miles.

Every one carries a difficulty rating: 333 easy, 308 moderate, and 123 hard. Of the 757 with measured elevation, Buchanan Pass Trail climbs the most, about 4,590 ft, and 51 gain 1,000 ft or more.

Explore by activity

773All trails

659Hiking 400Mountain biking

1,150Total miles

82Campsites

12Boat launches

23Waterfalls

79Trailheads

2Rapids

Sourdough TrailHikeMTB24.6 mi B360MTB22.6 mi Longmont-to-Boulder (LOBO) Regional TrailMTB19.9 mi Marshall MesaMTB18.4 mi Longmont Loop - SouthMTB17.6 mi Heil Valley RanchMTB17.3 mi Walker Ranch LoopMTB15.2 mi Boulder Valley Ranch TrailsHike15.2 mi Boulder Creek PathMTB13.7 mi Left Hand OHV TrailsMTB13.6 mi South Boulder Creek TrailMTB12.1 mi Boulder Valley RanchMTB10.6 mi Picture Rock TrailHikeMTB10.4 mi B180MTB10.3 mi Coal Creek TrailHikeMTB10.2 mi Wapiti TrailMTB9.7 mi Niwot Loop TrailHikeMTB9.3 mi Thunder Lake TrailHike8.9 mi Buchanan Pass TrailHikeMTB8.9 mi Rock Creek TrailHikeMTB8.8 mi East Boulder TrailMTB8.2 mi Betasso Preserve Trail NetwokMTB8.1 mi HobbitMTB8.0 mi Bitterbrush TrailMTB7.6 mi Arapaho Glacier TrailHike7.6 mi South Saint VrainMTB7.3 mi Saint Vrain GreenwayMTB7.2 mi Hall RanchMTB7.0 mi Switzerland Trail Colorado and North Western Rail RoadHikeMTB6.8 mi Broadway PathMTB6.8 mi Oligarchy Ditch TrailHikeMTB6.8 mi Beaver Creek TrailHike6.6 mi Wild Basin TrailHike6.6 mi Saint Vrain Mountain TrailHike6.4 mi Canyon LoopHikeMTB6.3 mi Dry Creek TrailHikeMTB6.3 mi Foothills Parkway PathMTB6.3 mi Mesa TrailHike6.3 mi Little Raven TrailMTB6.2 mi Blue DotMTB6.2 mi Devils Thumb TrailHike6.0 mi Hicks GulchHike6.0 mi Eagle Wind TrailMTB6.0 mi Buchannan Pass TrailHike5.5 mi Finch Lake - Pear Lake TrailHike5.4 mi Walker MountainHike5.3 mi bicycleMTB5.1 mi Open Sky LoopHikeMTB4.9 mi RattleSnake Gulch TrailMTB4.8 mi Mountain View Ave.MTB4.8 mi Night Hawk TrailHike4.6 mi Davidson MesaMTB4.5 mi Goose Creek GreenwayMTB4.5 mi Baseline Bike RouteMTB4.4 mi Sandbeach Lake TrailHike4.2 mi Rough and Ready Ditch TrailMTB4.1 mi Coulson Gulch TrailHike4.0 mi Coney Creek RoadMTB4.0 mi Wonderland Creek GreenwayHikeMTB3.9 mi King LakeHike3.8 mi Meadowlark TrailHikeMTB3.7 mi Diamond Lake TrailHike3.7 mi North Sky TrailHikeMTB3.7 mi Button Rock TrailHike3.6 mi Airport RoadMTB3.6 mi Mayhoffer TrailMTB3.6 mi County Road 92JMTB3.6 mi Re-RootMTB3.4 mi Indian Mesa TrailHikeMTB3.4 mi South Saint Vrain TrailHikeMTB3.4 mi Colorado Ave bike routeMTB3.3 mi Community Ditch TrailHikeMTB3.2 mi Eldorado Canyon TrailHike3.1 mi Saint Vrain Glacier TrailHike3.0 mi Davidson Mesa TrailHikeMTB3.0 mi Left Hand Creek TrailHikeMTB3.0 mi Eagle TrailHikeMTB3.0 mi Left Hand TrailHikeMTB3.0 mi Miller RockHikeMTB3.0 mi Lower Pixie DuffHikeMTB2.9 mi Winiger Ridge RoadHike2.9 mi Wild TurkeyMTB2.9 mi Wild Turkey Loop TrailHikeMTB2.9 mi 28th Street Bike RouteMTB2.9 mi Anemone Loop TrailHike2.8 mi Coalton TrailHikeMTB2.8 mi Powerline TrailHikeMTB2.7 mi CMC Ski Trail2.7 mi High Plains TrailHikeMTB2.7 mi Winiger Ridge TrailHikeMTB2.7 mi Taylor Mountain TrailHike2.6 mi Taylor Mountain SpurHikeMTB2.6 mi McCaslin TrailHikeMTB2.6 mi Clover Basin DrMTB2.6 mi Meyer's Homestead TrailHikeMTB2.6 mi Boy Scout SpurHikeMTB2.6 mi Ponderosa Loop TrailHikeMTB2.6 mi Foothills Parkway Multi-Use PathHikeMTB2.5 mi Niwot Ridge TrailHikeMTB2.5 mi Hobbit 2HikeMTB2.5 mi Lion's Lair TrailHike2.5 mi Slaughterhouse Gulch RoadHike2.4 mi Erie Loop TrailHikeMTB2.4 mi Wonderland Lake TrailHikeMTB2.4 mi Wonderland HillHike2.4 mi Betasso Link TrailMTB2.4 mi Woodland Lake TrailHike2.4 mi Mitchell Lake TrailHike2.4 mi Pawnee Pass TrailHike2.4 mi Boulder Canyon TrailHikeMTB2.4 mi Chapman DriveHikeMTB2.4 mi Gross Reservoir RoadHike2.3 mi Isabell Glacier TrailHike2.3 mi Pipeline TrailHikeMTB2.3 mi Finch Lake Cutoff TrailHike2.3 mi East Boulder - White Rocks TrailHikeMTB2.3 mi Benjamin LoopMTB2.3 mi Benjamin Trail LoopHikeMTB2.3 mi Storm GulchHike2.3 mi Elk TrailHike2.3 mi Oh Danny Boy LoopHike2.2 mi RebootHikeMTB2.2 mi Nelson LoopHikeMTB2.2 mi Wagener Trail2.2 mi Bear CanyonHike2.2 mi Waldrop TrailHikeMTB2.2 mi Nelson Loop TrailMTB2.2 mi Overland Loop TrailHikeMTB2.2 mi Sheep's WayHike2.2 mi Spring Brook Loop North TrailHikeMTB2.2 mi Gordon GulchHike2.2 mi Lykins Gulch / Supply Ditch TrailMTB2.2 mi Button Rock Mountain LoopHikeMTB2.2 mi Plants and AnimalsHike2.2 mi Doudy Draw TrailHikeMTB2.2 mi Bear Creek GreenwayHikeMTB2.2 mi Coney Lake TrailHike2.1 mi East Boulder - Teller Farm TrailHikeMTB2.1 mi ManagersHikeMTB2.1 mi Mount Audubon TrailHike2.1 mi Bear Creek PathMTB2.1 mi Lion Lake TrailHike2.1 mi East Boulder - Gunbarrel TrailHikeMTB2.1 mi North Sheep Mountain TrailHikeMTB2.1 mi Josie Heath TrailMTB2.1 mi Cony Lake TrailHike2.1 mi Fourmile Canyon Creek PathHikeMTB2.0 mi Flagstaff TrailHike2.0 mi East Boulder Community Park pathHikeMTB2.0 mi Sleepy Lion TrailHike2.0 mi Switzerland Trail Colo. & North Western R. R.Hike2.0 mi Apache TrailMTB1.9 mi Antelope TrailMTB1.9 mi Ouzel Lake TrailHike1.9 mi Green Mountain West Ridge TrailHike1.9 mi Little Thompson Overlook TrailMTB1.9 mi Ceran St. Vrain TrailHike1.9 mi Sugar MagnoliaMTB1.8 mi Sage TrailHikeMTB1.8 mi Shanahan - South Fork TrailHike1.8 mi Bright Trail ExtensionHike1.8 mi Lower Big Bluestem TrailHike1.8 mi Left Hand Reservoir RoadHikeMTB1.8 mi Willows TrailHikeMTB1.8 mi Bluebird Lake TrailHike1.8 mi Crook's NookHike1.8 mi Hogback Ridge TrailHike1.8 mi Gillespie GulchHike1.7 mi Mary Miller TrailHikeMTB1.7 mi Hoh'onookee Koh'owu TrailHike1.7 mi Bear Peak West Ridge TrailHike1.7 mi Boy Scout TrailHike1.7 mi Walden PondsHikeMTB1.7 mi Taylor MountainHikeMTB1.7 mi Bright TrailHikeMTB1.7 mi Left Hand Main TrailHikeMTB1.7 mi Allenspark TrailHike1.7 mi North Shore TrailHike1.7 mi Hover / Ken PrattMTB1.7 mi ObservatoryMTB1.7 mi Guinn Mountain TrailHikeMTB1.6 mi Goshawk Ridge TrailHike1.6 mi Sawhill PondsHike1.6 mi Cannon Mountain DitchHike1.6 mi Burning BushHikeMTB1.6 mi Fourmile Link TrailMTB1.6 mi Anne U White TrailHike1.6 mi Moorhead Bike RouteMTB1.6 mi NeverlandHikeMTB1.6 mi Dry Saint Vrain TrailHikeMTB1.6 mi Greenbelt Plateau TrailHikeMTB1.6 mi Harney LastokaHikeMTB1.5 mi Oh Danny BoyHike1.5 mi Grindstone Quarry TrailHike1.5 mi 28th Street PathHikeMTB1.5 mi North Rim TrailHikeMTB1.5 mi Forsythe Canyon TrailHikeMTB1.5 mi E.M. Greenman TrailHike1.5 mi hikingHike1.5 mi Colorado and North Western R. RHike1.5 mi Hidden ValleyHikeMTB1.5 mi Four Mile Creek TrailMTB1.5 mi The Righteous PathHikeMTB1.5 mi Vesper TrailHike1.5 mi Cradleboard TrailHikeMTB1.5 mi Switzerland Trail1.5 mi Aspen Alley TrailHikeMTB1.5 mi David Lee RothHikeMTB1.5 mi Fowler TrailHikeMTB1.5 mi Legend Ridge LoopHikeMTB1.5 mi Aspen AlleyMTB1.4 mi Fireman Hill TrailHikeMTB1.4 mi PipelineHikeMTB1.4 mi Hobbit 3MTB1.4 mi Crash'nHikeMTB1.4 mi Green Bear TrailHike1.4 mi Jean Lunning TrailHike1.4 mi Dakota Ridge TrailHike1.4 mi New 1HikeMTB1.4 mi Dry Creek Dr.MTB1.4 mi Singletree TrailMTB1.4 mi Cardinal Hill TrailHike1.4 mi Lazy H Horse Trail NetHike1.4 mi Joder Ranch TrailHikeMTB1.4 mi Rocks and RootsHikeMTB1.4 mi Upper Pixie DuffHikeMTB1.4 mi Lookout TrailHikeMTB1.3 mi Hidden Star TrailHikeMTB1.3 mi Barker Reservoir TrailHike1.3 mi Elmer's Two MileMTB1.3 mi Homestead TrailHike1.3 mi Cottonwood TrailHikeMTB1.3 mi The GrindHikeMTB1.3 mi Jenny Creek TrailHikeMTB1.3 mi Rattelsnake XCHikeMTB1.3 mi Dry CreekHike1.3 mi Ranger TrailHike1.3 mi Overbrook TrailHikeMTB1.3 mi Fuzzy SpiritHikeMTB1.3 mi SherwoodHikeMTB1.3 mi Lykins Gulch TrailHikeMTB1.3 mi Deer Ridge TrailHike1.3 mi ArkansasHikeMTB1.3 mi Twin Sisters Peak TrailHike1.3 mi Middle Saint Vrain TrailHikeMTB1.2 mi Red Rocks Spur TrailHike1.2 mi Sanitas Valley TrailHike1.2 mi Lakes Loop Snowshoe Trail1.2 mi Foothills North TrailHikeMTB1.2 mi Marshall Valley TrailHikeMTB1.2 mi Lichen Loop TrailHike1.2 mi Mount Sanitas TrailHike1.2 mi Inlet TrailHike1.2 mi Coney Non-Motorized SpurHikeMTB1.2 mi Snowshoe Trail1.2 mi Gregory Canyon TrailHike1.2 mi Waneka Lake TrailHikeMTB1.2 mi Sunshine Canyon TrailHike1.2 mi Elk TrickleHikeMTB1.2 mi Shadow Canyon TrailHike1.2 mi Saddle Rock TrailHike1.2 mi TNT TrailHike1.2 mi Boulder-Grand Pass TrailHike1.1 mi Niwot MountainHike1.1 mi Coon TrailHike1.1 mi Box-Eagle Lakes RouteHike1.1 mi Four Pines TrailHike1.1 mi Prairie Vista TrailHikeMTB1.1 mi Kinnickinnick LoopHikeMTB1.1 mi Enchanted Mesa TrailHike1.1 mi Spruce Gulch RoadHike1.1 mi Somerset TrailHikeMTB1.1 mi Spring Brook Loop South TrailHikeMTB1.1 mi Murder HorseHikeMTB1.1 mi TenderfootHike1.1 mi Cobalt TrailHikeMTB1.1 mi South Boulder Creek West TrailHike1.0 mi Rainbow Lakes TrailHike1.0 mi FudgepackerHikeMTB1.0 mi Cowdrey Draw TrailHikeMTB1.0 mi Ridge Road ConnecterHike1.0 mi Viewpoint TrailHike1.0 mi Skunk Creek GreenwayHikeMTB1.0 mi Fourmile Creek TrailHikeMTB1.0 mi Switzerland Trail Colorado and North Western R.R.Hike1.0 mi Skunk Canyon TrailHike1.0 mi Schoolhouse LoopHikeMTB1.0 mi Pine to Peaks LoopHike1.0 mi Canyon RimHikeMTB1.0 mi Summer SnowshoeHikeMTB1.0 mi Upper Big Bluestem TrailHike1.0 mi Star WarsHikeMTB1.0 mi Bon Scott TrailHikeMTB0.9 mi City of Lafayette TrailHikeMTB0.9 mi Kensington Ditch TrailHikeMTB0.9 mi Fern Canyon TrailHike0.9 mi Foothills SouthHikeMTB0.9 mi CMC Brainard Snowshoe trailHike0.9 mi Summer RoadHikeMTB0.9 mi Inlet LoopHike0.9 mi

More Colorado counties

638 trails · 1,595 mi

Larimer County

596 trails · 1,459 mi

Gunnison County

579 trails · 1,566 mi

← All of Colorado

Trail geometry from OpenStreetMap contributors, licensed ODbL. Elevation from the USGS 3D Elevation Program. Compiled and published by Trailmonger · trail data last rebuilt October 25, 2026.

Boulder County Trail Maps — Page 1 of 3

About trails in Boulder County, Colorado

What the trails in Boulder County are like

Explore by activity

Trails by town in Boulder County

More Colorado counties