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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Building Map
Loading Map Data
Map Settings
Featured Ride
Trail
Featured Rides
Trails

Featured Rides: 20

11.8 mi 19.0 km
Hall Ranch
Lyons, CO
11.8 mi 19.0 km Lyons, CO
All Clear
Update
Dry
6 days ago
124 
7.4 mi 11.9 km
Betasso Preserve
Boulder, CO
7.4 mi 11.9 km Boulder, CO
All Clear
Update
Mostly Dry
10 days ago
90 
7.8 mi 12.6 km
Walker Ranch
Coal Creek, CO
7.8 mi 12.6 km Coal Creek, CO
Minor Issues
Update
Snowy, Some Mud - It was tacky goodness on the south facing areas and thin patches of snow and ice in the shade and north facing areas. All very r...
99 days ago
78 
7.9 mi 12.7 km
Heil Ranch
Lyons, CO
7.9 mi 12.7 km Lyons, CO
All Clear
Update
Dry
6 days ago
58 
16.2 mi 26.1 km
Super Betasso
Boulder, CO
16.2 mi 26.1 km Boulder, CO
All Clear
Update
11 days ago
26 
Nederland, CO
16.3 mi 26.2 km Nederland, CO
Unknown
Update
14 
Superior, CO
10.3 mi 16.6 km Superior, CO
All Clear
Update
Dry
6 days ago
35 
15.2 mi 24.5 km
Dirty Bismarck
Superior, CO
15.2 mi 24.5 km Superior, CO
All Clear
Update
Dry - 1 or two puddles
16 days ago
57 
6.9 mi 11.1 km
West Magnolia Tour
Nederland, CO
6.9 mi 11.1 km Nederland, CO
Minor Issues
Update
Snowy - Mixed bag of wind drifts and postholed sections, recommend 5" tires aired way down
57 days ago
23 
Lyons, CO
32.9 mi 53.0 km Lyons, CO
All Clear
Update
Dry
6 days ago
10 
Boulder, CO
2.0 mi 3.2 km Boulder, CO
Unknown
Update
Superior, CO
12.6 mi 20.2 km Superior, CO
All Clear
Update
Dry
8 days ago
14 
Erie, CO
6.7 mi 10.8 km Erie, CO
All Clear
Update
Dry - riding is good. some of the berms have ruts from muddier rides. Mostly dry, all clear as stated by Erie Singltrack
15 days ago
10 
28.4 mi 45.6 km
Super Walker
Boulder, CO
28.4 mi 45.6 km Boulder, CO
Bad / Closed
Update
There is loads of snow right now. Be careful.
81 days ago
12.3 mi 19.7 km
Super Magic Bus
Nederland, CO
12.3 mi 19.7 km Nederland, CO
Bad / Closed
Update
Snowy - Powder day
42 days ago
11 
28.9 mi 46.6 km
Ned Bus Shuttle
Nederland, CO
28.9 mi 46.6 km Nederland, CO
Unknown
Update
12.2 mi 19.6 km
East Boulder Trail
Gunbarrel, CO
12.2 mi 19.6 km Gunbarrel, CO
Unknown
Update
Nederland, CO
6.2 mi 9.9 km Nederland, CO
Minor Issues
Update
Snowy, Icy, Fallen Trees - Patches of snow and ice and downed trees throughout but fully rideable on a fattie with good tread up to the loop. Mille...
5 days ago
11.8 mi 18.9 km
Rock Creek Farm Loop
Broomfield, CO
11.8 mi 18.9 km Broomfield, CO
Minor Issues
Update
Trail seems to be fine, but always be prepared for mud. Stay safe guys
11 days ago
Boulder, CO
11.4 mi 18.4 km Boulder, CO
Unknown
Update

Trails: 105

5.1 mi 8.1 km
Picture Rock
Lyons, CO
5.1 mi 8.1 km Lyons, CO
All Clear
Update
Dry
6 days ago
48 
2.2 mi 3.6 km
Nelson Loop
Lyons, CO
2.2 mi 3.6 km Lyons, CO
All Clear
Update
Dry
6 days ago
23 
1.2 mi 1.9 km
Betasso Link Trail
Boulder, CO
1.2 mi 1.9 km Boulder, CO
All Clear
Update
11 days ago
29 
2.3 mi 3.7 km
Benjamin Loop
Boulder, CO
2.3 mi 3.7 km Boulder, CO
All Clear
Update
Mostly Dry
10 days ago
18 
Lyons, CO
1.4 mi 2.2 km Lyons, CO
All Clear
Update
Dry
6 days ago
18 
Nederland, CO
6.0 mi 9.7 km Nederland, CO
Minor Issues
Update
Snowy - Snow on top of ice. Rideable just be aware Fat bike only
25 days ago
0.1 mi 0.2 km
XL Slopestyle
Boulder, CO
0.1 mi 0.2 km Boulder, CO
Unknown
Update
0.1 mi 0.2 km
Dual Slalom
Boulder, CO
0.1 mi 0.2 km Boulder, CO
Unknown
Update
0.1 mi 0.1 km
Medium Slopestyle
Boulder, CO
0.1 mi 0.1 km Boulder, CO
Unknown
Update
0.1 mi 0.2 km
Small Slopestyle
Boulder, CO
0.1 mi 0.2 km Boulder, CO
Unknown
Update
Boulder, CO
0.6 mi 1.0 km Boulder, CO
Unknown
Update
2.8 mi 4.4 km
Wild Turkey Trail
Lyons, CO
2.8 mi 4.4 km Lyons, CO
All Clear
Update
Dry
6 days ago
20 
3.3 mi 5.3 km
Canyon Loop
Boulder, CO
3.3 mi 5.3 km Boulder, CO
All Clear
Update
Mostly Dry
10 days ago
18 
3.2 mi 5.2 km
School Bus #929
Nederland, CO
3.2 mi 5.2 km Nederland, CO
Unknown
Update
0.1 mi 0.2 km
Large Slopestyle
Boulder, CO
0.1 mi 0.2 km Boulder, CO
Unknown
Update
0.7 mi 1.0 km
Black Line
Erie, CO
0.7 mi 1.0 km Erie, CO
All Clear
Update
Dry
16 days ago
1.7 mi 2.8 km
Little Raven Trail
Nederland, CO
1.7 mi 2.8 km Nederland, CO
Bad / Closed
Update
Snowy - XC ski only during winter. Closed to fat bikers.
29 days ago
2.6 mi 4.1 km
Wapiti Trail
Lyons, CO
2.6 mi 4.1 km Lyons, CO
All Clear
Update
Dry
6 days ago
18 
Nederland, CO
5.9 mi 9.5 km Nederland, CO
All Clear
Update
Snowy
87 days ago
11 
0.8 mi 1.3 km
Fourmile Link
Boulder, CO
0.8 mi 1.3 km Boulder, CO
Unknown
Update
1.8 mi 2.9 km
Re-Root #927
Nederland, CO
1.8 mi 2.9 km Nederland, CO
Minor Issues
Update
Snowy - Mixed bag of wind drifts and postholed sections, recommend 5" tires aired way down
57 days ago
2.6 mi 4.2 km
Ponderosa Loop
Lyons, CO
2.6 mi 4.2 km Lyons, CO
All Clear
Update
Dry
6 days ago
16 
3.0 mi 4.8 km
Eagle Wind
Lyons, CO
3.0 mi 4.8 km Lyons, CO
Minor Issues
Update
Muddy
23 days ago
10 
0.9 mi 1.4 km
Sugar Magnolia #926
Nederland, CO
0.9 mi 1.4 km Nederland, CO
Unknown
Update
Nederland, CO
0.8 mi 1.3 km Nederland, CO
Unknown
Update
0.4 mi 0.6 km
Hotlap
Boulder, CO
0.4 mi 0.6 km Boulder, CO
Unknown
Update
0.3 mi 0.5 km
Dirt 101
Boulder, CO
0.3 mi 0.5 km Boulder, CO
Unknown
Update
0.1 mi 0.2 km
Corkscrew
Boulder, CO
0.1 mi 0.2 km Boulder, CO
Unknown
Update
Superior, CO
1.4 mi 2.2 km Superior, CO
All Clear
Update
Dry
8 days ago
12 
Boulder, CO
1.9 mi 3.1 km Boulder, CO
All Clear
Update
Dry
8 days ago
12 
0.6 mi 0.9 km
Coal Seam
Superior, CO
0.6 mi 0.9 km Superior, CO
Bad / Closed
Update
There is loads of snow right now. Be careful.
81 days ago
2.2 mi 3.5 km
Doudy Draw
Superior, CO
2.2 mi 3.5 km Superior, CO
All Clear
Update
Dry
8 days ago
14 
Nederland, CO
2.9 mi 4.6 km Nederland, CO
Unknown
Update
2.6 mi 4.2 km
Winiger Ridge Trail
Coal Creek, CO
2.6 mi 4.2 km Coal Creek, CO
Unknown
Update
11.4 mi 18.3 km
Coal Creek Trail
Superior, CO
11.4 mi 18.3 km Superior, CO
All Clear
Update
Mostly Dry
27 days ago
2.3 mi 3.7 km
Wapiti Trail
Nederland, CO
2.3 mi 3.7 km Nederland, CO
Unknown
Update
1.1 mi 1.7 km
Reboot
Nederland, CO
1.1 mi 1.7 km Nederland, CO
Minor Issues
Update
Snowy - Mixed bag of wind drifts and postholed sections, recommend 5" tires aired way down
57 days ago
0.9 mi 1.4 km
Marshall Valley
Superior, CO
0.9 mi 1.4 km Superior, CO
Bad / Closed
Update
There is loads of snow right now. Be careful.
81 days ago
2.6 mi 4.2 km
High Plains
Superior, CO
2.6 mi 4.2 km Superior, CO
Minor Issues
Update
Some Mud - Large muddy spot coal creek cattle gate. I would recommend dismounting and lifting bike on Very fence or carry it through gate. Other th...
22 days ago
2.9 mi 4.7 km
Left Hand
Niwot, CO
2.9 mi 4.7 km Niwot, CO
Unknown
Update
1.0 mi 1.6 km
Hobbit 3 #927
Nederland, CO
1.0 mi 1.6 km Nederland, CO
Minor Issues
Update
Snowy - Mixed bag of wind drifts and postholed sections, recommend 5" tires aired way down
57 days ago
Superior, CO
2.1 mi 3.4 km Superior, CO
Minor Issues
Update
Mostly Dry - Three or four small mud spots. Very rideable.
22 days ago
11 
Lyons, CO
0.9 mi 1.5 km Lyons, CO
Unknown
Update
0.7 mi 1.2 km
Green Trail
Erie, CO
0.7 mi 1.2 km Erie, CO
All Clear
Update
Dry
16 days ago
Coal Creek, CO
2.6 mi 4.2 km Coal Creek, CO
Unknown
Update
0.7 mi 1.2 km
Hobbit 2 #927
Nederland, CO
0.7 mi 1.2 km Nederland, CO
Minor Issues
Update
Snowy - Mixed bag of wind drifts and postholed sections, recommend 5" tires aired way down
57 days ago
2.3 mi 3.6 km
Waldrop Trail
Nederland, CO
2.3 mi 3.6 km Nederland, CO
All Clear
Update
Snowy - Fat biking only.
29 days ago
Gunbarrel, CO
2.1 mi 3.3 km Gunbarrel, CO
Unknown
Update
Nederland, CO
1.9 mi 3.1 km Nederland, CO
Minor Issues
Update
Snowy, Icy, Fallen Trees - Patches of snow and ice and downed trees throughout but fully rideable on a fattie with good tread up to the loop. Mille...
5 days ago
Nederland, CO
0.8 mi 1.3 km Nederland, CO
Unknown
Update
3.3 mi 5.3 km
Dry Creek Trail
Lafayette, CO
3.3 mi 5.3 km Lafayette, CO
All Clear
Update
Dry
99 days ago
0.2 mi 0.3 km
Skillz Loop
Boulder, CO
0.2 mi 0.3 km Boulder, CO
Unknown
Update
0.1 mi 0.2 km
Espresso
Boulder, CO
0.1 mi 0.2 km Boulder, CO
Unknown
Update
Coal Creek, CO
1.0 mi 1.7 km Coal Creek, CO
Minor Issues
Update
Snowy, Some Mud - It was tacky goodness on the south facing areas and thin patches of snow and ice in the shade and north facing areas. All very r...
99 days ago
0.7 mi 1.1 km
Boot
Nederland, CO
0.7 mi 1.1 km Nederland, CO
Minor Issues
Update
Snowy - Mixed bag of wind drifts and postholed sections, recommend 5" tires aired way down
57 days ago
Gunbarrel, CO
2.2 mi 3.5 km Gunbarrel, CO
Unknown
Update
Niwot, CO
3.7 mi 6.0 km Niwot, CO
Unknown
Update
Niwot, CO
2.5 mi 4.1 km Niwot, CO
Unknown
Update
Niwot, CO
2.3 mi 3.6 km Niwot, CO
Unknown
Update
3.7 mi 6.0 km
Community Ditch
Superior, CO
3.7 mi 6.0 km Superior, CO
Minor Issues
Update
Mostly Dry, Some Mud
44 days ago
13 
1.1 mi 1.8 km
Prairie Vista
Superior, CO
1.1 mi 1.8 km Superior, CO
Bad / Closed
Update
There is loads of snow right now. Be careful.
81 days ago
Superior, CO
3.0 mi 4.8 km Superior, CO
All Clear
Update
Mostly Dry
58 days ago
0.5 mi 0.9 km
Lookout Trail #926
Nederland, CO
0.5 mi 0.9 km Nederland, CO
Unknown
Update
3.2 mi 5.1 km
Eagle
Gunbarrel, CO
3.2 mi 5.1 km Gunbarrel, CO
Minor Issues
Update
Snowy - Walked it today, unlikely anything but a floaty fat bike could ride it. Will be better packed if it stays cold tomorrow.
82 days ago
8.2 mi 13.3 km
Boulder Creek Path
Boulder, CO
8.2 mi 13.3 km Boulder, CO
Unknown
Update
2.1 mi 3.3 km
Interim Joder Trail
Niwot, CO
2.1 mi 3.3 km Niwot, CO
Unknown
Update
0.5 mi 0.9 km
Sunset Ridge
Erie, CO
0.5 mi 0.9 km Erie, CO
All Clear
Update
Dry
16 days ago
1.1 mi 1.8 km
Hobbit 1 #927
Nederland, CO
1.1 mi 1.8 km Nederland, CO
Minor Issues
Update
Snowy - Mixed bag of wind drifts and postholed sections, recommend 5" tires aired way down
57 days ago
0.8 mi 1.3 km
Cowdrey Draw
Superior, CO
0.8 mi 1.3 km Superior, CO
Minor Issues
Update
Mostly Dry, Some Mud
44 days ago
0.5 mi 0.8 km
Aspen Alley
Nederland, CO
0.5 mi 0.8 km Nederland, CO
Unknown
Update
2.3 mi 3.8 km
Meadowlark
Superior, CO
2.3 mi 3.8 km Superior, CO
Unknown
Update
0.7 mi 1.1 km
Blue Trail
Erie, CO
0.7 mi 1.1 km Erie, CO
All Clear
Update
Dry
16 days ago
Boulder, CO
3.4 mi 5.4 km Boulder, CO
All Clear
Update
Dry
7 days ago
Gunbarrel, CO
1.9 mi 3.1 km Gunbarrel, CO
Unknown
Update
Niwot, CO
2.9 mi 4.7 km Niwot, CO
Unknown
Update
1.3 mi 2.0 km
Cottontail Trail
Gunbarrel, CO
1.3 mi 2.0 km Gunbarrel, CO
Unknown
Update
1.4 mi 2.3 km
Greenbelt Plateau
Superior, CO
1.4 mi 2.3 km Superior, CO
Bad / Closed
Update
There is loads of snow right now. Be careful.
81 days ago
2.6 mi 4.2 km
Chapman Drive
Boulder, CO
2.6 mi 4.2 km Boulder, CO
Unknown
Update
0.6 mi 1.0 km
Little Raven East
Nederland, CO
0.6 mi 1.0 km Nederland, CO
Unknown
Update
0.9 mi 1.5 km
Rock Creek Trail
Broomfield, CO
0.9 mi 1.5 km Broomfield, CO
All Clear
Update
Dry
99 days ago
8.8 mi 14.2 km
Lake Link Trail
Broomfield, CO
8.8 mi 14.2 km Broomfield, CO
All Clear
Update
Dry
99 days ago
0.5 mi 0.7 km
Erie Forest
Erie, CO
0.5 mi 0.7 km Erie, CO
All Clear
Update
Dry
16 days ago
Superior, CO
1.2 mi 1.9 km Superior, CO
Bad / Closed
Update
There is loads of snow right now. Be careful.
81 days ago
2.3 mi 3.7 km
Foothills
Boulder, CO
2.3 mi 3.7 km Boulder, CO
Unknown
Update
1.3 mi 2.1 km
Twin Lakes Loops
Gunbarrel, CO
1.3 mi 2.1 km Gunbarrel, CO
Unknown
Update
1.6 mi 2.6 km
Mary Miller Trail
Broomfield, CO
1.6 mi 2.6 km Broomfield, CO
All Clear
Update
Dry
99 days ago
Lyons, CO
2.0 mi 3.2 km Lyons, CO
Unknown
Update
Gunbarrel, CO
1.1 mi 1.7 km Gunbarrel, CO
Unknown
Update
3.1 mi 4.9 km
Davidson Mesa Loop
Louisville, CO
3.1 mi 4.9 km Louisville, CO
Unknown
Update
2.4 mi 3.8 km
355
Nederland, CO
2.4 mi 3.8 km Nederland, CO
Unknown
Update
1.5 mi 2.5 km
CR 132 West
Nederland, CO
1.5 mi 2.5 km Nederland, CO
Unknown
Update
1.2 mi 1.9 km
Kinnickinnick Loop
Nederland, CO
1.2 mi 1.9 km Nederland, CO
Unknown
Update
0.9 mi 1.4 km
Tungsten Loop
Nederland, CO
0.9 mi 1.4 km Nederland, CO
Unknown
Update
1.2 mi 2.0 km
Dots Access Road
Nederland, CO
1.2 mi 2.0 km Nederland, CO
Unknown
Update
2.1 mi 3.3 km
CU South Campus
Boulder, CO
2.1 mi 3.3 km Boulder, CO
Bad / Closed
Update
There is loads of snow right now. Be careful.
81 days ago
1.3 mi 2.0 km
Cottonwood Trail
Gunbarrel, CO
1.3 mi 2.0 km Gunbarrel, CO
Unknown
Update
3.6 mi 5.7 km
Boulder Reservoir
Gunbarrel, CO
3.6 mi 5.7 km Gunbarrel, CO
Unknown
Update
Gunbarrel, CO
2.1 mi 3.4 km Gunbarrel, CO
Unknown
Update
2.8 mi 4.5 km
Coalton
Superior, CO
2.8 mi 4.5 km Superior, CO
Bad / Closed
Update
There is loads of snow right now. Be careful.
81 days ago
1.9 mi 3.0 km
Sage
Gunbarrel, CO
1.9 mi 3.0 km Gunbarrel, CO
Unknown
Update
1.7 mi 2.7 km
Indian Mesa
Lyons, CO
1.7 mi 2.7 km Lyons, CO
Unknown
Update
1.6 mi 2.5 km
North Rim
Boulder, CO
1.6 mi 2.5 km Boulder, CO
Unknown
Update
0.4 mi 0.6 km
355T
Nederland, CO
0.4 mi 0.6 km Nederland, CO
Unknown
Update
1.5 mi 2.4 km
355D
Nederland, CO
1.5 mi 2.4 km Nederland, CO
Unknown
Update
0.9 mi 1.5 km
355C
Nederland, CO
0.9 mi 1.5 km Nederland, CO
Unknown
Update