Next Meetup

Knobby Monday; Lefthand Trail at Boulder Valley Ranch
The Boulder Mountainbike Alliance is a volunteer-run, membership-based, 501(c)(3) nonprofit organization. BMA'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 skill clinics, social rides, events, advocacy, and trail building. Learn more about BMA here Knobby Mondays are for beginners. This is a no drop ride, fun, and great for improving your riding! Join the fun on mountain bikes! Practice your skills, have fun, and be safe riding trails! Before each ride we will review the fundamentals of bike/body position, shifting, and braking, then we will head out to an entry level trail to ride. Ride Guides will stop from time to time to check in with the group, and give opportunities to work on the fundamentals. IMPORTANT INFO ABOUT THE RIDE - All riders MUST wear a helmet, bring water, and have a trail-ready bike. - All riders ride at their own risk, group leaders take no responsibility for rider safety/injury. - Riders must sign a liability waiver once during the season. If this is your first ride of the season, please be prepared to complete one at the meeting spot. - Riders should also carry basic tools: a spare tube in your correct tire size, a pump, tire lever, a chain tool and basic Allen wrenches.Snacks are recommended. - Rides launch at 6:00 p.m. so be at the trail head by 5:45 p.m., dressed and ready to roll by 6 p.m. - If the weather is iffy make sure to check this page after 3:00 p.m. for updated info. If you signed up for the ride you should also receive an email in the event of a cancellation. - For permitting and planning purposes, please sign up if you plan to join us. Send us an email if you have any questions - [masked]

Boulder Valley Ranch Trailhead

3900 Longhorn Rd · Boulder, CO

Upcoming Meetups

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What we're about

This is the Meetup group of the Boulder Mountainbike Alliance (BMA). We have over 4 group rides every week for riders of all levels. Rides are open to everyone (members and non-members). Find out more about BMA at

About BMA
The mission of BMA 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. Join BMA today to support our efforts!

This group hosts weekly group mountain bike rides for those who want to explore the MTB trails around Boulder with others at their level. The rides are meant to be fun for all, so those intimidated by more advanced riders, fear not. If you need to get off your bike and walk it up a steep or tricky section, it's OK! We try to keep a pace that works for the whole group. All our rides have a Ride Guide, and many also have a sweep and are "no-drop" rides.

Our weekly rides:
Monday - Knobby Monday (beginner)
Tuesday - GurlzRide (beginner, intermediate)
Wednesday - Wednesday a.m. ride (all levels)
Thursday - Trails & Ale (intermediate, advanced-intermediate)

Looking to improve your riding? We also offer MTB Skills Clinics for all levels.
Find our more about skills clinics

Want to get involved? We are an all volunteer organization and are always looking for enthusiastic people to lead rides, volunteer at events, help with admin, participate on a committee etc. Email us at to get involved.

Here are some of the trails we frequently ride around Boulder: Betasso, Marshal Mesa, Dowdy Draw, Heil Ranch, Walker Ranch. You can find more information about these and other local trails on the trail descriptions area of our website which has an excellent breakdown of trail lengths, technical difficulty, elevation gain, etc.

Please arrive a few minutes before the posted time of the ride. If it says the ride is at 6pm, then that's when we start peddling. Looking forward to seeing you on the trail!

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