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.

Events


Jan 13, 2017 Fat Bike Demo Day!

Jan 13, 2017 Celebrate Magnolia Trails!

Dec 8, 2016 BMA Annual Board Retreat

20

105

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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
Minor Issues
Update
Muddy, Snowy, Icy: Rideable to Nelson Loop. Many areas of mud, especially at beginning of Upper Bitterbrush. Did not ride Nelson Loop.
2 days ago
124 
Nederland, CO
16.3 mi 26.2 km Nederland, CO
All Clear
Update
Dry
72 days ago
14 
7.4 mi 11.9 km
Betasso Preserve
Boulder, CO
7.4 mi 11.9 km Boulder, CO
Bad / Closed
Update
Muddy - Slushy and wet.
8 days ago
89 
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...
58 days ago
76 
16.2 mi 26.1 km
Super Betasso
Boulder, CO
16.2 mi 26.1 km Boulder, CO
Minor Issues
Update
Snowy. Logging operations have concluded so Betasso is re-opened as normal (No bikes Wednesdays or Saturdays)
27 days ago
25 
7.9 mi 12.7 km
Heil Ranch
Lyons, CO
7.9 mi 12.7 km Lyons, CO
Minor Issues
Update
Snowy, Mostly Dry
21 days ago
58 
Lyons, CO
32.9 mi 53.0 km Lyons, CO
All Clear
Update
Dry
73 days ago
10 
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
16 days ago
23 
Superior, CO
10.3 mi 16.6 km Superior, CO
Minor Issues
Update
Mostly Dry - Couple of spots of mud but nothing horrible.
17 days ago
34 
15.2 mi 24.5 km
Dirty Bismarck
Superior, CO
15.2 mi 24.5 km Superior, CO
Minor Issues
Update
Muddy - Lots of mud on the southern singletrack but only for about 200 yards, the rest is clear.
2 days ago
57 
Boulder, CO
2.0 mi 3.2 km Boulder, CO
Unknown
Update
Superior, CO
12.6 mi 20.2 km Superior, CO
Minor Issues
Update
Mostly Dry - Couple of spots of mud but nothing horrible.
17 days ago
14 
Erie, CO
6.7 mi 10.8 km Erie, CO
All Clear
Update
Dry: Great fall conditions... little dry/loose in spots.
86 days ago
10 
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
1 day ago
11 
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.
40 days ago
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: Great for Fatties - could probably get away with 3.0+ except for the drifty parts up near miller rock.
18 days ago
11.8 mi 18.9 km
Rock Creek Farm Loop
Broomfield, CO
11.8 mi 18.9 km Broomfield, CO
All Clear
Update
Dry
58 days ago
Boulder, CO
11.4 mi 18.4 km Boulder, CO
Unknown
Update

Trails: 105

2.2 mi 3.6 km
Nelson Loop
Lyons, CO
2.2 mi 3.6 km Lyons, CO
All Clear
Update
Small spots of ice but still very rideable
16 days ago
22 
5.1 mi 8.1 km
Picture Rock
Lyons, CO
5.1 mi 8.1 km Lyons, CO
Minor Issues
Update
Some Mud: Mostly dry up to the first bridge. Pretty muddy in spots past that point.
58 days ago
47 
Lyons, CO
1.4 mi 2.2 km Lyons, CO
Minor Issues
Update
Muddy, Snowy, Icy: Rideable to Nelson Loop. Many areas of mud, especially at beginning of Upper Bitterbrush. Did not ride Nelson Loop.
2 days ago
17 
2.3 mi 3.7 km
Benjamin Loop
Boulder, CO
2.3 mi 3.7 km Boulder, CO
Minor Issues
Update
Snowy. Logging operations have concluded so Betasso is re-opened as normal (No bikes Wednesdays or Saturdays)
27 days ago
17 
Nederland, CO
6.0 mi 9.7 km Nederland, 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
62 days ago
20 
1.2 mi 1.9 km
Betasso Link Trail
Boulder, CO
1.2 mi 1.9 km Boulder, CO
Minor Issues
Update
Muddy, Snowy
27 days ago
27 
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
3.3 mi 5.3 km
Canyon Loop
Boulder, CO
3.3 mi 5.3 km Boulder, CO
Minor Issues
Update
Snowy. Logging operations have concluded so Betasso is re-opened as normal (No bikes Wednesdays or Saturdays)
27 days ago
17 
3.2 mi 5.2 km
School Bus #929
Nederland, CO
3.2 mi 5.2 km Nederland, CO
All Clear
Update
Dry
80 days ago
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: Great fall conditions... little dry/loose in spots.
86 days ago
2.6 mi 4.1 km
Wapiti Trail
Lyons, CO
2.6 mi 4.1 km Lyons, CO
All Clear
Update
Dry
62 days ago
17 
Nederland, CO
5.7 mi 9.2 km Nederland, CO
All Clear
Update
Snowy
46 days ago
11 
1.7 mi 2.8 km
Little Raven Trail
Nederland, CO
1.7 mi 2.8 km Nederland, CO
Unknown
Update
2.6 mi 4.2 km
Ponderosa Loop
Lyons, CO
2.6 mi 4.2 km Lyons, CO
Minor Issues
Update
Snowy, Mostly Dry
21 days ago
16 
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
16 days ago
0.8 mi 1.3 km
Fourmile Link
Boulder, CO
0.8 mi 1.3 km Boulder, CO
Bad / Closed
Update
Fallen Trees - Closed on weekdays through Thanksgiving for tree work. Open on weekends.
73 days ago
Boulder, CO
1.9 mi 3.1 km Boulder, CO
Minor Issues
Update
Muddy - A good amount of mud in places.... think heavy mud. Pull over and unclog your tires mud. Still some snow but not bad there. Still fun an...
17 days ago
12 
0.9 mi 1.4 km
Sugar Magnolia #926
Nederland, CO
0.9 mi 1.4 km Nederland, CO
Unknown
Update
3.0 mi 4.8 km
Eagle Wind
Lyons, CO
3.0 mi 4.8 km Lyons, CO
All Clear
Update
Dry
92 days ago
Nederland, CO
0.8 mi 1.3 km Nederland, CO
All Clear
Update
Dry: No snow, which is pretty sad for mid November!
64 days ago
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
2.2 mi 3.5 km
Doudy Draw
Superior, CO
2.2 mi 3.5 km Superior, CO
Minor Issues
Update
Muddy - A good amount of mud in places.... think heavy mud. Pull over and unclog your tires mud. Still some snow but not bad there. Still fun an...
17 days ago
14 
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.
40 days ago
Superior, CO
1.4 mi 2.2 km Superior, CO
Minor Issues
Update
Muddy - A good amount of mud in places.... think heavy mud. Pull over and unclog your tires mud. Still some snow but not bad there. Still fun an...
17 days ago
11 
Nederland, CO
2.9 mi 4.6 km Nederland, CO
All Clear
Update
Dry: No snow, which is pretty sad for mid November!
64 days ago
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
Bad / Closed
Update
There is loads of snow. Be careful.
40 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
16 days ago
2.6 mi 4.2 km
High Plains
Superior, CO
2.6 mi 4.2 km Superior, CO
Bad / Closed
Update
There is loads of snow right now. Be careful.
40 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.
40 days ago
2.9 mi 4.7 km
Left Hand
Niwot, CO
2.9 mi 4.7 km Niwot, CO
All Clear
Update
Dry
65 days ago
Superior, CO
2.1 mi 3.4 km Superior, CO
Bad / Closed
Update
There is loads of snow right now. Be careful.
40 days ago
11 
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
16 days ago
Lyons, CO
0.9 mi 1.5 km Lyons, 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
16 days ago
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
3 days ago
13 
0.7 mi 1.2 km
Green Trail
Erie, CO
0.7 mi 1.2 km Erie, CO
All Clear
Update
Dry: Great fall conditions... little dry/loose in spots.
86 days ago
Coal Creek, CO
2.6 mi 4.2 km Coal Creek, CO
All Clear
Update
Dry
94 days ago
2.3 mi 3.6 km
Waldrop Trail
Nederland, CO
2.3 mi 3.6 km Nederland, CO
Unknown
Update
Gunbarrel, CO
2.1 mi 3.3 km Gunbarrel, CO
Unknown
Update
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.
40 days ago
Superior, CO
3.0 mi 4.8 km Superior, CO
All Clear
Update
Mostly Dry
17 days ago
Nederland, CO
1.9 mi 3.1 km Nederland, CO
Minor Issues
Update
Snowy, Icy: Great for Fatties - could probably get away with 3.0+ except for the drifty parts up near miller rock.
18 days ago
Nederland, CO
0.8 mi 1.3 km Nederland, CO
All Clear
Update
Dry: No snow, which is pretty sad for mid November!
64 days ago
3.3 mi 5.3 km
Dry Creek Trail
Lafayette, CO
3.3 mi 5.3 km Lafayette, CO
All Clear
Update
Dry
58 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...
58 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
16 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
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.
41 days ago
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: Great fall conditions... little dry/loose in spots.
86 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
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
16 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
3 days ago
0.7 mi 1.1 km
Blue Trail
Erie, CO
0.7 mi 1.1 km Erie, CO
All Clear
Update
Dry: Great fall conditions... little dry/loose in spots.
86 days ago
Boulder, CO
3.4 mi 5.4 km Boulder, CO
Bad / Closed
Update
There is loads of snow right now. Be careful.
40 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
8.2 mi 13.3 km
Boulder Creek Path
Boulder, CO
8.2 mi 13.3 km Boulder, CO
All Clear
Update
Dry
77 days ago
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.
40 days ago
2.6 mi 4.2 km
Chapman Drive
Boulder, CO
2.6 mi 4.2 km Boulder, CO
All Clear
Update
Now open after trail reconstruction. Still minor work being done, watch for work crews.
75 days ago
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
58 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
58 days ago
0.5 mi 0.7 km
Erie Forest
Erie, CO
0.5 mi 0.7 km Erie, CO
All Clear
Update
Dry: Great fall conditions... little dry/loose in spots.
86 days ago
2.3 mi 3.7 km
Foothills
Boulder, CO
2.3 mi 3.7 km Boulder, CO
Unknown
Update
Superior, CO
1.2 mi 1.9 km Superior, CO
Bad / Closed
Update
There is loads of snow right now. Be careful.
40 days ago
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
58 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
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.
40 days ago
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
All Clear
Update
Dry: No snow, which is pretty sad for mid November!
64 days ago
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.
40 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
1.9 mi 3.0 km
Sage
Gunbarrel, CO
1.9 mi 3.0 km Gunbarrel, CO
All Clear
Update
Dry
65 days ago
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
All Clear
Update
Dry
65 days ago
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