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Boulder Mountainbike Alliance


OUR MISSION:

The Boulder Mountainbike Alliance's mission is to serve as a positive voice for mountain biking in the greater Boulder Colorado area by improving the trail experience for all users through social rides and events, advocacy, and trail building.

Great communities build trails, and great trails build community.

To fullfill this mission, the Boulder Mountainbike Alliance works towards three major goals:

Create a Community of Mountain Bikers: Part of creating sustainable trails is ensuring that there will always be a community around to care for and advocate for those trails. BMA can't do its job without a community of bikers who understand and support our mission. And we build that community around a shared love of trails, then back it up with fun social events and group rides.

Advocate for Trail Access: Originally established in 1991 as the Boulder Offroad Alliance (BOA), Boulder Mountainbike Alliance was formed in response to the closure of nearly every trail in the Boulder area to mountain bikes. This group became the only representative organization for mountain bikers who wanted the right to ride legally in Boulder again.

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Map Key

Recommended Routes: 23

7.4 mi 11.9 km Betasso Preserve
Intermediate
Boulder, CO
Intermediate
Boulder, CO
All Clear
Update
Dry - very dry, a few small muddy spots but that's about it
6 days ago
289 
11.8 mi 18.9 km Hall Ranch
Difficult
Lyons, CO
Difficult
Lyons, CO
All Clear
Update
Some Mud
4 days ago
271 
13.1 mi 21.1 km West Mag Backcountry Big Ride
Intermediate/Difficult
Nederland, CO
Intermediate/Difficult
Nederland, CO
Bad / Closed
Update
Snowy, Icy - Not possible to MTB right now. All chunky snow mixed with ice. Trail running is possible but would be annoying.
25 days ago
74 
7.8 mi 12.6 km Walker Ranch
Difficult
Coal Creek, CO
Difficult
Coal Creek, CO
Bad / Closed
Update
Muddy: Was G2G on 05/2 until a massive rainstorm that drenched me and continued throughout the evening. Give it a few days to dry.
3 days ago
249 
14.6 mi 23.5 km Picture Rock/Wild Turkey Loop
Intermediate
Lyons, CO
Intermediate
Lyons, CO
Bad / Closed
Update
Muddy - closed due to mud
23 hours ago
89 
10.4 mi 16.8 km Marshall Mesa - Doudy Draw Loops
Intermediate
Superior, CO
Intermediate
Superior, CO
All Clear
Update
Mostly Dry, Some Mud
5 days ago
111 
12.6 mi 20.3 km Spring Brook Loop
Intermediate
Superior, CO
Intermediate
Superior, CO
Minor Issues
Update
Some Mud
5 days ago
109 
8.0 mi 12.8 km Heil Ranch
Intermediate
Lyons, CO
Intermediate
Lyons, CO
All Clear
Update
Mostly Dry, Some Mud
31 days ago
198 
15.7 mi 25.3 km Dirty Bismark
Intermediate
Superior, CO
Intermediate
Superior, CO
Bad / Closed
Update
Muddy
3 days ago
230 
8.4 mi 13.5 km West Magnolia Tour
Intermediate
Nederland, CO
Intermediate
Nederland, CO
Bad / Closed
Update
Snowy - Wind drifted and ungroomed. Not fat bikeable until they start grooming.
84 days ago
69 
16.2 mi 26.1 km Super Betasso
Intermediate/Difficult
Boulder, CO
Intermediate/Difficult
Boulder, CO
Unknown
Update
64 
16.3 mi 26.2 km South Saint Vrain Figure 8
Difficult
Nederland, CO
Difficult
Nederland, CO
Unknown
Update
59 
10.2 mi 16.5 km Rhythm & Blues
Intermediate/Difficult
Nederland, CO
Intermediate/Difficult
Nederland, CO
Unknown
Update
25 
10.1 mi 16.3 km Ride like a Moto
Difficult
Niwot, CO
Difficult
Niwot, CO
Minor Issues
Update
Some Mud
6 days ago
47 
33.1 mi 53.3 km Heil to Picture to Hall and Back
Difficult
Lyons, CO
Difficult
Lyons, CO
Unknown
Update
30 
71.3 mi 114.8 km Indian Peaks Traverse (IPT)
Intermediate/Difficult
Boulder, CO
Intermediate/Difficult
Boulder, CO
Unknown
Update
2.0 mi 3.2 km Valmont Bike Park - Singletrack Hotlap
Intermediate
Boulder, CO
Intermediate
Boulder, CO
All Clear
Update
28 days ago
25 
6.7 mi 10.8 km Post Work Sunset Ride
Intermediate
Erie, CO
Intermediate
Erie, CO
Bad / Closed
Update
Muddy
3 days ago
36 
12.0 mi 19.3 km The N Bus Loop
Difficult
Nederland, CO
Difficult
Nederland, CO
Unknown
Update
12.2 mi 19.6 km East Boulder Trail
Easy
Gunbarrel, CO
Easy
Gunbarrel, CO
All Clear
Update
Dry
5 days ago
14 
6.2 mi 9.9 km Ceran St. Vrain to Miller Rock
Intermediate/Difficult
Nederland, CO
Intermediate/Difficult
Nederland, CO
Unknown
Update
18 
11.8 mi 18.9 km Rock Creek Farm Loop
Easy
Broomfield, CO
Easy
Broomfield, CO
All Clear
Update
Dry
12 days ago
17 
11.4 mi 18.4 km Chapman Drive Out-And-Back
Easy/Intermediate
Boulder, CO
Easy/Intermediate
Boulder, CO
All Clear
Update
Mostly Dry
28 days ago
13 

Trails: 110

2.5 mi 4.0 km Bitterbrush - Lower Section
Difficult
Lyons, CO
Difficult
Lyons, CO
Minor Issues
Update
Some Mud - For the most part dry, wet spots in the rocks, some muddy places.
6 days ago
83 
5.3 mi 8.5 km Picture Rock
Intermediate
Lyons, CO
Intermediate
Lyons, CO
Bad / Closed
Update
Muddy - closed due to mud
23 hours ago
104 
2.2 mi 3.6 km Nelson Loop
Intermediate
Lyons, CO
Intermediate
Lyons, CO
All Clear
Update
Dry - Wet spots in a couple of places on the more technical south climb. Otherwise dry
6 days ago
60 
1.2 mi 1.9 km Betasso Link Trail
Difficult
Boulder, CO
Difficult
Boulder, CO
All Clear
Update
Dry
6 days ago
68 
3.3 mi 5.3 km Canyon Loop
Intermediate
Boulder, CO
Intermediate
Boulder, CO
All Clear
Update
Dry - very dry, a few small muddy spots but that's about it
6 days ago
51 
1.4 mi 2.2 km Bitterbrush - Upper Section
Intermediate
Lyons, CO
Intermediate
Lyons, CO
All Clear
Update
Some Mud
4 days ago
41 
2.3 mi 3.7 km Benjamin Loop
Intermediate
Boulder, CO
Intermediate
Boulder, CO
All Clear
Update
Dry - very dry, a few small muddy spots but that's about it
6 days ago
36 
2.6 mi 4.1 km Wapiti Trail
Intermediate/Difficult
Lyons, CO
Intermediate/Difficult
Lyons, CO
Bad / Closed
Update
Fire damage. Lefthand Canyon trailheads closed
39 days ago
49 
0.9 mi 1.5 km Antelope Trail
Intermediate
Lyons, CO
Intermediate
Lyons, CO
All Clear
Update
Some Mud
4 days ago
40 
6.0 mi 9.7 km South Saint Vrain Trail (#909)
Very Difficult
Nederland, CO
Very Difficult
Nederland, CO
Unknown
Update
25 
0.7 mi 1.0 km Black Line
Difficult
Erie, CO
Difficult
Erie, CO
Bad / Closed
Update
Muddy
3 days ago
24 
2.9 mi 4.7 km Wild Turkey Trail
Intermediate
Lyons, CO
Intermediate
Lyons, CO
Unknown
Update
35 
2.7 mi 4.3 km Ponderosa Loop
Intermediate
Lyons, CO
Intermediate
Lyons, CO
Unknown
Update
37 
3.0 mi 4.8 km Eagle Wind
Intermediate
Lyons, CO
Intermediate
Lyons, CO
All Clear
Update
Dry
25 days ago
37 
0.1 mi 0.2 km Dual Slalom
Intermediate/Difficult
Boulder, CO
Intermediate/Difficult
Boulder, CO
Unknown
Update
0.1 mi 0.2 km Large Slopestyle
Difficult
Boulder, CO
Difficult
Boulder, CO
Unknown
Update
3.2 mi 5.2 km School Bus #929
Intermediate
Nederland, CO
Intermediate
Nederland, CO
Unknown
Update
22 
0.1 mi 0.2 km XL Slopestyle
Very Difficult
Boulder, CO
Very Difficult
Boulder, CO
Unknown
Update
0.1 mi 0.2 km Corkscrew
Intermediate/Difficult
Boulder, CO
Intermediate/Difficult
Boulder, CO
Unknown
Update
10 
5.9 mi 9.5 km South Sourdough (#835)
Difficult
Nederland, CO
Difficult
Nederland, CO
Unknown
Update
28 
0.8 mi 1.3 km Schoolhouse Loop
Easy
Lyons, CO
Easy
Lyons, CO
Minor Issues
Update
Some Mud
6 days ago
0.3 mi 0.5 km Short Stack
Intermediate
Nederland, CO
Intermediate
Nederland, CO
Unknown
Update
4.1 mi 6.6 km Hobbit
Intermediate
Nederland, CO
Intermediate
Nederland, CO
Unknown
Update
0.1 mi 0.1 km Medium Slopestyle
Intermediate/Difficult
Boulder, CO
Intermediate/Difficult
Boulder, CO
Unknown
Update
2.2 mi 3.5 km Doudy Draw
Intermediate
Superior, CO
Intermediate
Superior, CO
Minor Issues
Update
Some Mud
5 days ago
30 
0.8 mi 1.3 km Fourmile Link
Intermediate
Boulder, CO
Intermediate
Boulder, CO
Unknown
Update
20 
0.6 mi 1.0 km The Glades - Outer Loop
Intermediate
Boulder, CO
Intermediate
Boulder, CO
Unknown
Update
2.3 mi 3.7 km Spring Brook Loop North
Intermediate
Boulder, CO
Intermediate
Boulder, CO
All Clear
Update
Some Mud - no mud that might get you off the bike
5 days ago
24 
1.5 mi 2.4 km Aspen Alley Trail #342A
Intermediate
Nederland, CO
Intermediate
Nederland, CO
Unknown
Update
15 
1.9 mi 3.0 km Re-Root #927
Intermediate/Difficult
Nederland, CO
Intermediate/Difficult
Nederland, CO
Unknown
Update
16 
0.1 mi 0.2 km Small Slopestyle
Intermediate
Boulder, CO
Intermediate
Boulder, CO
Unknown
Update
0.7 mi 1.1 km Blue Trail
Intermediate
Erie, CO
Intermediate
Erie, CO
Bad / Closed
Update
Muddy
3 days ago
20 
1.9 mi 3.1 km Ceran Saint Vrain #801
Intermediate/Difficult
Nederland, CO
Intermediate/Difficult
Nederland, CO
Unknown
Update
0.7 mi 1.2 km Green Trail
Easy/Intermediate
Erie, CO
Easy/Intermediate
Erie, CO
Bad / Closed
Update
Muddy
3 days ago
17 
1.1 mi 1.8 km Spring Brook Loop South
Intermediate
Boulder, CO
Intermediate
Boulder, CO
Minor Issues
Update
Mostly Dry: Some muddy sections in corners, easy to get through.
5 days ago
24 
0.3 mi 0.5 km Dirt 101
Intermediate
Boulder, CO
Intermediate
Boulder, CO
Unknown
Update
11.4 mi 18.3 km Coal Creek Trail
Easy/Intermediate
Superior, CO
Easy/Intermediate
Superior, CO
All Clear
Update
Dry
4 days ago
15 
0.9 mi 1.5 km Sugar Magnolia #926
Difficult
Nederland, CO
Difficult
Nederland, CO
Unknown
Update
12 
0.1 mi 0.2 km Espresso
Easy/Intermediate
Boulder, CO
Easy/Intermediate
Boulder, CO
Unknown
Update
1.7 mi 2.8 km Little Raven Trail
Difficult
Nederland, CO
Difficult
Nederland, CO
Unknown
Update
0.9 mi 1.4 km Marshall Valley
Intermediate
Superior, CO
Intermediate
Superior, CO
All Clear
Update
5 days ago
12 
0.6 mi 0.9 km Coal Seam
Intermediate
Superior, CO
Intermediate
Superior, CO
All Clear
Update
5 days ago
2.1 mi 3.4 km Flatirons Vista South
Easy/Intermediate
Superior, CO
Easy/Intermediate
Superior, CO
All Clear
Update
Some Mud - no mud that might get you off the bike
5 days ago
20 
0.4 mi 0.6 km Hobbit 3 #927
Intermediate
Nederland, CO
Intermediate
Nederland, CO
Unknown
Update
11 
2.7 mi 4.4 km High Plains
Easy/Intermediate
Superior, CO
Easy/Intermediate
Superior, CO
All Clear
Update
Mostly Dry
10 days ago
13 
2.1 mi 3.3 km Interim Joder Trail
Intermediate
Niwot, CO
Intermediate
Niwot, CO
Minor Issues
Update
Some Mud
6 days ago
16 
2.9 mi 4.7 km Left Hand
Easy/Intermediate
Niwot, CO
Easy/Intermediate
Niwot, CO
All Clear
Update
Dry
30 days ago
11 
1.0 mi 1.7 km Josie Heath Trail
Intermediate
Coal Creek, CO
Intermediate
Coal Creek, CO
Unknown
Update
2.6 mi 4.2 km Meyers Homestead Trail
Easy/Intermediate
Coal Creek, CO
Easy/Intermediate
Coal Creek, CO
All Clear
Update
Dry
31 days ago
12 
0.8 mi 1.3 km Whoop-Di-Doos
Intermediate/Difficult
Nederland, CO
Intermediate/Difficult
Nederland, CO
Unknown
Update
1.1 mi 1.7 km Reboot
Intermediate/Difficult
Nederland, CO
Intermediate/Difficult
Nederland, CO
Unknown
Update
2.3 mi 3.7 km Wapiti Trail
Difficult
Nederland, CO
Difficult
Nederland, CO
Unknown
Update
0.7 mi 1.1 km Boot
Intermediate
Nederland, CO
Intermediate
Nederland, CO
Unknown
Update
0.4 mi 0.6 km Hotlap
Easy
Boulder, CO
Easy
Boulder, CO
Unknown
Update
2.9 mi 4.6 km Blue Dot Trail (#606.1)
Difficult
Nederland, CO
Difficult
Nederland, CO
Unknown
Update
3.0 mi 4.8 km Mayhoffer Singletree
Easy
Superior, CO
Easy
Superior, CO
All Clear
Update
Mostly Dry
10 days ago
10 
2.6 mi 4.2 km Winiger Ridge Trail
Intermediate/Difficult
Coal Creek, CO
Intermediate/Difficult
Coal Creek, CO
Unknown
Update
2.3 mi 3.8 km Meadowlark
Easy/Intermediate
Superior, CO
Easy/Intermediate
Superior, CO
All Clear
Update
Dry
33 mins ago
0.2 mi 0.3 km Skillz Loop
Easy
Boulder, CO
Easy
Boulder, CO
Unknown
Update
3.2 mi 5.1 km Eagle
Easy/Intermediate
Gunbarrel, CO
Easy/Intermediate
Gunbarrel, CO
All Clear
Update
Dry
7 days ago
11 
8.2 mi 13.3 km Boulder Creek Path
Easy
Boulder, CO
Easy
Boulder, CO
All Clear
Update
Dry
10 days ago
13 
2.5 mi 4.0 km Foothills
Easy/Intermediate
Boulder, CO
Easy/Intermediate
Boulder, CO
Minor Issues
Update
Some Mud
41 days ago
8.8 mi 14.2 km Lake Link Trail
Easy/Intermediate
Broomfield, CO
Easy/Intermediate
Broomfield, CO
Unknown
Update
3.7 mi 6.0 km Community Ditch
Easy/Intermediate
Superior, CO
Easy/Intermediate
Superior, CO
Minor Issues
Update
Some Mud
5 days ago
18 
1.1 mi 1.8 km Prairie Vista
Easy
Superior, CO
Easy
Superior, CO
Unknown
Update
10 
0.5 mi 0.9 km Sunset Ridge
Easy/Intermediate
Erie, CO
Easy/Intermediate
Erie, CO
Bad / Closed
Update
Muddy
3 days ago
1.2 mi 1.9 km Flatirons Vista North
Easy/Intermediate
Superior, CO
Easy/Intermediate
Superior, CO
All Clear
Update
Dry
32 days ago
10 
2.1 mi 3.3 km East Boulder Trail - White Rocks Section
Easy/Intermediate
Gunbarrel, CO
Easy/Intermediate
Gunbarrel, CO
All Clear
Update
35 days ago
2.6 mi 4.2 km Chapman Drive
Easy/Intermediate
Boulder, CO
Easy/Intermediate
Boulder, CO
Unknown
Update
3.6 mi 5.7 km Boulder Reservoir
Easy
Gunbarrel, CO
Easy
Gunbarrel, CO
All Clear
Update
Dry
39 days ago
0.5 mi 0.7 km Erie Forest
Easy/Intermediate
Erie, CO
Easy/Intermediate
Erie, CO
Bad / Closed
Update
Muddy
3 days ago
0.9 mi 1.4 km Tungsten Loop
Easy/Intermediate
Nederland, CO
Easy/Intermediate
Nederland, CO
Unknown
Update
1.2 mi 1.9 km Kinnickinnick Loop
Easy/Intermediate
Nederland, CO
Easy/Intermediate
Nederland, CO
Unknown
Update
2.3 mi 3.6 km Waldrop Trail
Difficult
Nederland, CO
Difficult
Nederland, CO
Unknown
Update
2.1 mi 3.3 km CU South Campus
Easy
Boulder, CO
Easy
Boulder, CO
Unknown
Update
1.4 mi 2.3 km Greenbelt Plateau
Easy/Intermediate
Superior, CO
Easy/Intermediate
Superior, CO
All Clear
Update
Mostly Dry
10 days ago
13 
0.6 mi 0.9 km Lookout Trail #926
Intermediate/Difficult
Nederland, CO
Intermediate/Difficult
Nederland, CO
Unknown
Update
3.7 mi 6.0 km Niwot Loop - Lower Section
Easy
Niwot, CO
Easy
Niwot, CO
Unknown
Update
1.5 mi 2.4 km 355.1D
Easy
Nederland, CO
Easy
Nederland, CO
Unknown
Update
1.9 mi 3.0 km Sage
Easy
Gunbarrel, CO
Easy
Gunbarrel, CO
Minor Issues
Update
Mostly Dry, Some Mud
96 days ago
3.3 mi 5.3 km Dry Creek Trail
Easy
Lafayette, CO
Easy
Lafayette, CO
Unknown
Update
2.5 mi 4.1 km Niwot Loop - Upper Section
Easy
Niwot, CO
Easy
Niwot, CO
Unknown
Update
2.3 mi 3.6 km Niwot Loop - Niwot High School Trail
Easy
Niwot, CO
Easy
Niwot, CO
Unknown
Update
0.9 mi 1.4 km Observatory Trail #355
Intermediate
Nederland, CO
Intermediate
Nederland, CO
Unknown
Update
0.9 mi 1.5 km Little Thompson Overlook
Intermediate/Difficult
Lyons, CO
Intermediate/Difficult
Lyons, CO
All Clear
Update
Mostly Dry - A couple short, shallow mud spots. Very rideable.
59 days ago
2.8 mi 4.5 km Coalton
Easy/Intermediate
Superior, CO
Easy/Intermediate
Superior, CO
All Clear
Update
Dry
4 days ago
12 
0.8 mi 1.3 km Yellow Dot Trail (#357.2A)
Intermediate/Difficult
Nederland, CO
Intermediate/Difficult
Nederland, CO
Unknown
Update
0.6 mi 1.0 km Little Raven East
Difficult
Nederland, CO
Difficult
Nederland, CO
Unknown
Update
0.8 mi 1.3 km Cowdrey Draw
Easy/Intermediate
Superior, CO
Easy/Intermediate
Superior, CO
All Clear
Update
Mostly Dry
10 days ago
7.3 mi 11.7 km LoBo Trail
Easy
Longmont, CO
Easy
Longmont, CO
Unknown
Update
1.9 mi 3.1 km Cottontail Trail - Gunbarrel Section
Easy
Gunbarrel, CO
Easy
Gunbarrel, CO
Unknown
Update
3.4 mi 5.4 km South Boulder Creek Trail
Easy
Boulder, CO
Easy
Boulder, CO
All Clear
Update
Dry
33 days ago
2.2 mi 3.5 km East Boulder Trail - Gunbarrel Farm Section
Easy/Intermediate
Gunbarrel, CO
Easy/Intermediate
Gunbarrel, CO
Bad / Closed
Update
closed for utilities-trail maintenance on the west side from white rock trail connection. signed said something about 3 weeks of closure
1 day ago
1.3 mi 2.0 km Cottontail Trail
Easy
Gunbarrel, CO
Easy
Gunbarrel, CO
Unknown
Update
3.1 mi 4.9 km Davidson Mesa Loop
Easy
Louisville, CO
Easy
Louisville, CO
Unknown
Update
0.9 mi 1.5 km Rock Creek Trail
Easy/Intermediate
Broomfield, CO
Easy/Intermediate
Broomfield, CO
All Clear
Update
Dry
12 days ago
1.2 mi 2.0 km Dots Access Road
Intermediate
Nederland, CO
Intermediate
Nederland, CO
Unknown
Update
0.8 mi 1.3 km Red Dot Trail (#357.2B)
Intermediate/Difficult
Nederland, CO
Intermediate/Difficult
Nederland, CO
Unknown
Update
2.0 mi 3.2 km North Sheep Mountain Trail
Very Difficult
Lyons, CO
Very Difficult
Lyons, CO
Unknown
Update
2.4 mi 3.8 km 355.1
Easy/Intermediate
Nederland, CO
Easy/Intermediate
Nederland, CO
Unknown
Update
1.6 mi 2.6 km Mary Miller Trail
Easy
Broomfield, CO
Easy
Broomfield, CO
All Clear
Update
Dry
38 days ago
1.1 mi 1.7 km Twin Lakes Regional Trail
Easy
Gunbarrel, CO
Easy
Gunbarrel, CO
Unknown
Update
2.1 mi 3.4 km East Boulder Trail - Teller Farm Section
Easy
Gunbarrel, CO
Easy
Gunbarrel, CO
All Clear
Update
35 days ago
2.0 mi 3.2 km Cottonwood Trail
Easy
Gunbarrel, CO
Easy
Gunbarrel, CO
Bad / Closed
Update
Trail closed from 3/17/21 - 7/30/21 for repairs. https://bouldercolorado.gov/newsroom/city-to-temporarily-close-the-cottontai
49 days ago
1.5 mi 2.5 km CR 132 West
Easy
Nederland, CO
Easy
Nederland, CO
Unknown
Update
1.3 mi 2.1 km Twin Lakes Loops
Easy
Gunbarrel, CO
Easy
Gunbarrel, CO
Unknown
Update
1.7 mi 2.7 km Indian Mesa
Easy
Lyons, CO
Easy
Lyons, CO
Unknown
Update
1.6 mi 2.5 km North Rim
Easy/Intermediate
Boulder, CO
Easy/Intermediate
Boulder, CO
Minor Issues
Update
Mostly Dry, Some Mud
96 days ago
0.9 mi 1.5 km 355.1C
Easy
Nederland, CO
Easy
Nederland, CO
Unknown
Update
0.4 mi 0.7 km 355.1A
Easy
Nederland, CO
Easy
Nederland, CO
Unknown
Update