Boulder · United States

Marathon races near Boulder

4 races in 2026 next one in 32 days

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5K 10K Half MarathonMarathon

Race calendar

Upcoming Marathon races near Boulder

AUG 4

Run · road · Marathon

Bound for Boston Marathon & Half Marathon - Denver

Denver · 41 km away

Run · road · Marathon

Fort Collins Running Summit

Fort Collins · 66 km away

Run · road · Marathon

Boulder Rez Marathon

Run · road · Marathon

RMRR Fall Marathon Training Series

Thornton · 29 km away

Boulder · 80 km

4 races mapped View on map →

Recurring Marathon races near Boulder

Races that repeat — weekly, monthly or yearly

The Long View Marathon

The Long View Marathon runs point to point between Fort Collins and Loveland in northern Colorado. The full marathon begins at Edora Park and concludes at Fairgrounds Park. The same finish area hosts the half marathon, which starts at Fossil Creek Park, and a 5K centered on Fairgrounds Park. The races occur in October, with staggered morning starts for the marathon, half marathon, and 5K. The route incorporates sections of the Long View and Front Range bike paths, meaning the longer races utilize a paved-path corridor instead of a closed downtown loop. Packet pickup is available at Altitude Running in Fort Collins prior to race day and at each race’s start area on race morning, subject to a strict cutoff. Marathon and half-marathon prizes feature custom works by local artist Amy Hayman, gift cards to local businesses, overall awards, and age-group prizes; the 5K offers overall and masters awards.

Marathon At The MAC

Marathon At The MAC is a self-paced indoor marathon on the MAC walking track. Participants complete 26.2 miles on their own schedule by walking, jogging, or running a total of 208 laps. After each walk or run, participants report their lap count to the MAC front counter staff, so the marathon can be built up over multiple visits. Runners and walkers scan in with a MAC Walking Track Pass when they arrive, participants under 18 need an adult with them, and everyone who finishes the full distance receives a T-shirt.

The Colorado Marathon

The Colorado Marathon is a road race in Fort Collins, typically held on the first weekend of May. It includes a full marathon, half marathon, 10K, 5K, and a children's run. The full marathon begins early, attracting thousands of participants, ranging from local residents running shorter distances to marathoners aiming for a personal best or a Boston Marathon qualification. The marathon route follows the Poudre River Canyon for most of its distance before entering Fort Collins' natural areas and concluding in the city. This predominantly downhill course is a significant draw; in its initial four years, 18% of participants achieved a Boston Marathon qualifying time. Originally named the Fort Collins Old Town Marathon, the event maintains a local focus through charity entries, which are priced higher with proceeds directed to local charitable organizations.

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Looking for something else near Boulder?

5K running Boulder → 128 10K running Boulder → 58 Half Marathon running Boulder → 46

Other races in the next 90 days

All sports & distances →

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HRCA Badlands Circuit

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About Marathon races in Boulder

Boulder Base Miles

Boulder hosts 7 Marathon races in 2026 within 80 km of the city centre — upcoming dates, recurring series, and other races nearby, all in one place.

Boulder gives runners more than 150 miles of trails, so locals rarely run the same week twice. Mesa Trail rolls from Chautauqua Park with Flatirons views, and the full out-and-back runs half-marathon distance with over 2,000 feet of vert. Mt. Sanitas climbs 1,300 feet in under a mile and a half, so the fitness has nowhere to hide. South Boulder Creek Trail and Bobolink Trail suit chill Z2 days. Boulder Track Club, Elevate Run Club, Fleet Feet Boulder, Avanti Run Club, and RISE Running keep the group calendar busy. Bolder BOULDER 10K, the 2026 Dash & Dine 5k Run Series, and Boulder Marathon give the city its anchor races.

Boulder riders get road, gravel, singletrack, and base miles right out the door. Boulder Cycling Club runs Tuesday Night Rides from Twisted Pine Brewery at 5:30 PM and Thursday Night Rides from Upslope Brewery at 5:30 PM. The long version is 2 km with 500 m of elevation. The short version is 7 km with 275 m. The climb is 5 km with 3,112 m of gain. Wednesday Morning Velo and Valmont Short Track Series keep the race legs sharp.

June through September is the cleanest block for longer runs, steady rides, and cool summer nights. Elevate Run Club has long runs every Saturday at 7 am in the summer months, and locals stack Z2, intervals, and trail days before the afternoon heat matters. Boulder Cycling Club weekly rides resume in March, so road and gravel season ramps before summer really lands. Winter stays pretty damn mild when you put it in perspective. Bike paths are regularly plowed clear, and people ride all winter on fat tire bikes with snow tires. Shady areas hold snow after sunny days, so locals watch the ice and keep moving.