Marathons in Colorado

Colorado is home to 3 marathons in our database in United States, spread across cities including Boulder, Denver, and Fort Collins. Denver Colfax Marathon is the largest race in the lineup, typically drawing around 2,178 finishers, while the full spread offers everything from fast urban courses to scenic regional events. Browse the races below for course maps, elevation profiles, typical weather, and practical race-day detail to help you choose your next start line. Plan by month on our marathon calendar or filter by country and region.

Boulder, Colorado, United States🇺🇸

Boulderthon Marathon

The Boulderthon Marathon draws approximately 1,500 finishers each September on an urban and foothills road in Boulder, United States. Its branding and local support turned it into a fast-growing Rocky Mountain marathon almost immediately. The course passes Pearl Street, CU Boulder, and open roads beneath the Flatirons with broad Front Range views. Pearl Street, CU Boulder, and open roads beneath the Flatirons climb with broad Front Range views on this fast-growing Rocky Mountain marathon.

Next race: Sunday, 6 September 2026

Fort Collins, Colorado, United States🇺🇸

Colorado Marathon

The Colorado Marathon draws approximately 1,800 finishers each May on a canyon point-to-point road in Fort Collins, United States. It delivers a scenic mountain-canyon descent without the extreme grade of some western downhill marathons. The course follows the Cache la Poudre River, red-rock canyon walls, and the approach into northern Colorado neighborhoods. The route is net downhill overall.

Next race: Sunday, 2 May 2027

Denver, Colorado, United States🇺🇸

Denver Colfax Marathon

The Denver Colfax Marathon attracts approximately 2,178 finishers each May along America's longest continuous main street — Colfax Avenue. The course follows the full 42 km of Colfax from the eastern plains through downtown Denver to the western foothills at 1,600 m altitude. May's Mile High City spring and the iconic Colfax Avenue strip make it one of Colorado's most distinctive urban marathons.

Next race: Sunday, 23 May 2027

Nearby Marathons

Other races closest to Colorado.

Provo, Utah, United States🇺🇸· 556 km away

Utah Valley Marathon

The Utah Valley Marathon draws approximately 2,200 finishers each June on a canyon point-to-point road in Provo, United States. Its long gentle descent makes it a common target for personal bests and Boston qualifying attempts. The route passes Deer Creek-adjacent canyon roads, the Provo River corridor, and broad urban streets near BYU. The route is net downhill overall.

Next race: Sunday, 6 June 2027

Salt Lake City, Utah, United States🇺🇸· 578 km away

REVEL Big Cottonwood Marathon

The REVEL Big Cottonwood Marathon is a net-downhill speed course drawing approximately 2,500 finishers each September through Utah's Wasatch Mountains. Starting at Brighton Ski Resort (2,590 m) and descending Big Cottonwood Canyon to Salt Lake City, the course drops roughly 1,200 m on scenic mountain highway. September's crisp alpine morning and the fast descent make it one of America's most popular personal-best marathons.

Next race: Saturday, 19 September 2026

Salt Lake City, Utah, United States🇺🇸· 578 km away

Salt Lake City Marathon

The Salt Lake City Marathon draws approximately 1,500 finishers each April on an urban road in Salt Lake City, United States. Descending from the east bench gives the race a quick first half before the city grid settles the pace. The course passes This Is The Place Heritage Park, Liberty Park, and temple district streets with Wasatch views throughout. The route is net downhill overall.

Next race: Sunday, 4 April 2027

Ogden, Utah, United States🇺🇸· 591 km away

Ogden Marathon

The Ogden Marathon draws approximately 2,500 finishers each May on a canyon point-to-point road in Ogden, United States. The canyon start gives the event one of the most scenic road descents on the U.S. spring calendar. The course passes steep canyon walls, pine-lined descents, and the Union Station area in the city finish. The route is net downhill overall.

Next race: Sunday, 2 May 2027

Lincoln, Nebraska, United States🇺🇸· 718 km away

Lincoln Marathon

The Lincoln Marathon draws approximately 1,052 finishers each May on an urban road in Lincoln, United States. It is Nebraska's premier marathon and a long-standing Boston-qualifier with a competitive Midwestern field each spring. The course passes the Capitol, the University of Nebraska campus, and tree-lined city boulevards through the Star City. The Capitol, University of Nebraska campus, and tree-lined boulevards roll through the Star City on Nebraska's premier Boston-qualifier each May.

Next race: Sunday, 2 May 2027