Building More Fun Trails

We dig trails!

Building More Fun Trails

We build and improve multi-use trails across Boulder County. Our trail building events typically take place on weekday evenings and weekends from April to September of each year.

The City of Boulder, the County of Boulder, the U.S. Forest Service, and the City of Black Hawk recognize BMA as a committed partner thanks to our trail building expertise and the thousands of volunteer hours we donate.

Check out our full schedule of group trail building events. If you are looking for something more personalized, we can accommodate private trail building events for groups of five or more.

Upcoming Trail Building


North Sky

BMA is teaming up with City of Boulder Open Space & Mountain Parks to build a brand new trail to connect North Boulder to Joder Ranch. 

Find out more about North Sky

Wapiti Reroute & Improvement

Nearly 3 years after the devesting Calwood fire, Heil Valley Ranch is back on the road to recovery – including a pair of Golden Eagles. These hardy birds lost their original nest in the fire and found a new spot very close to the Wapiti trail which necessitated a closure of the first section of singletrack. BMA advocated for the funnest route, and it will open in Summer 2024. BMA is also performing maintenance and improvements on Upper Wapiti from the reroute to the Ponderosa intersection.

Betasso, Heil Valley Ranch & Hall Ranch

BMA continues to work with Boulder County Parks & Open Space to build and improve the trails at Betasso Preserve, Heil Valley Ranch and Hall Ranch.  In 2021 and 2022 we improved the Picture Rock trail and 2023 work was completed on Wild Turkey.

Marshall Mesa

BMA is partnering with the City of Boulder Mountain Parks and Open Space to improve the trails at Marshall Mesa. In 2017 and 2018, BMA improved over a mile of High Plains trail by taking it out of a drainage ditch and adding fun berms and bumps. In 2018, BMA also worked on Doudy Draw to eliminate trail braiding and added several A/B alternative rock lines. 2019’s work continued on Doudy Draw and Coal Seam, including adding a cow grate. Community Ditch got a new fun line in 2020. In 2021, we put the finishing touches on Community Ditch and made improvements on Springbrook Loop. 2022 saw more improvements on Doudy Draw. In 2024, we’ll be helping with Greenbelt Plateau maintenance.

Brainard / South St.Vrain

In 2018, BMA fixed the eroded section on South Saint Vrain and turned it into a super fun gnarly armored downhill line. We’ll continue to work on trails in the Brainard area as the opportunity arises.


After years of partnership with the Boulder Ranger District, a $30,000 planning grant, and a ton of hard work, the US Forest Service (USFS) has approved an expansion of trails around the Nederland area that is on scale with Buffalo Creek. We are about 80% finished with Phase 1 (out of 4) of this project. This new system includes:

  • 44+ miles of new trails
  • 20+ miles of reclaimed user-created trails
  • New restrooms and expanded parking
  • Future potential to connect trails to Winter Park
  • Ride from Nederland
  • Improved signage and mapping


We can schedule private volunteer trail building events for groups of 5 or more. We’ll work with your schedule and needs, let us know what you’re looking for!