Cycling & running events in Boulder, 2026

Boulder Base Miles

Running: Locals run Boulder like a trailhead with coffee nearby. The Boulder Creek Path runs 5 miles one way while hugging the Boulder Creek. Mesa Trail gives you 13 miles out and back with Flatirons in your face. Betasso Preserve links Canyon loop and Benjamin loops for about 10 miles with around 1,000 feet of vert. RISE Running, The Boulder Track Club, Elevate Run Club, Fleet Feet Boulder, and Avanti Run Club keep the group-run calendar full. Bolder BOULDER 10K is the anchor event.

Cycling: Locals ride road, gravel, path, and singletrack without leaving the Boulder orbit. Boulder Cycling Club rolls Tuesday Night Rides at 5:30 PM from Twisted Pine Brewery and Thursday Night Rides at 5:30 PM from Upslope Brewery. Wednesday Morning Velo brings the big group energy from Gateway Fun Park. Marshall Mesa, Teller Farms, Spring Brook loop, Boulder Reservoir and Open Sky Loop, and Dirty Bismark cover Z2, intervals, and gravel legs. Flagstaff Mountain, Boulder Canyon, Lefthand Canyon, Gold Hill, Switzerland Trail, and Nederland hold the climbs. Buffalo Bicycle Classic, Valmont Short Track Series, and a cyclocross-style crit mindset give the calendar bite.

Season: Boulder works year-round, but locals treat spring through fall as the cleanest block for base miles, trail volume, and long rides. Summer brings warm days, cool nights, and frequent afternoon thunderstorms, so most people start early on Mesa Trail, Magnolia Road, and Boulder Weekend Loop days. The roads and bike paths stay useful in winter because the sun can melt snow fast and Chinook winds can bring quick warm-ups. Runners watch shady spots on Sanitas and Betasso, and cyclists swap to fat tire bikes or studded tires when snow and ice stick around.