Logo

Boulder Rez Marathon

Boulder, United States • 15 Aug 2026

Boulder Rez Marathon : event overview

The Boulder Rez Marathon takes place at Boulder Reservoir in Boulder, Colorado on August 15, 2026. Distances offered include:

  • 10K
  • Half Marathon
  • 3/4 Marathon
  • Marathon
  • Marathon Relay

The course runs alongside Boulder Reservoir and stays mostly on dirt roads and trails. The route is described as flat with approximately 200 feet of elevation gain and provides views of the reservoir and the Rocky Mountains. The event is USATF sanctioned, with accurately measured and clearly marked courses and electronic timing results. Participants receive a shirt and finishers receive a medal.

Logistics and awards

Packet pickup is available the day before the race at Fleet Feet Boulder, 2775 Pearl, Boulder, CO, and on race day at the Boulder Reservoir parking lot finish area. There are tiered entry fees that vary by registration date. Volunteers of all ages are welcome; volunteers under 13 must be accompanied by a parent or guardian during their shift. Awards are given to the overall top three male and female finishers and in age groups: 19 & under; 20-29; 30-39; 40-49; 50-59; 60-69; 70-79; 80+. Visit the organization's website for the most recent information.

United States Colorado Boulder

Race information

Website
Marathon
Marathon
Marathon
Marathon Relay
31 km
3/4 Marathon
Half Marathon
Half Marathon
10 km
10k
Visit the organization's website for the most recent information.
Trail runs nearby

Sourdough Snowshoe Race

Nederland

The Sourdough Snowshoe Race in Nederland, CO is a donation based backcountry event offering 18K and 30K routes where snowshoes are required. Enjoy rugged alpine scenery with a warming tent and hot drinks at the finish.

Virginia Canyon Is for Lovers

Idaho Springs

A two-person partner race on Virginia Canyon road in Idaho Springs, CO, held on Valentine’s Day. Runners each complete a roughly 12-mile out-and-back; team time is the sum of both individual times and multiple awards are offered.

Run The Ranch

Loveland

...

Trail races on private ranch trails at Sylvan Dale Guest Ranch in Loveland, Colorado over two days in April 2026. Events range from 5K and 10K to 4, 6 and 12 hour timed races plus relay and virtual options.

Samson's Revenge

Estes Park

Trail trail race at the YMCA of the Rockies in Estes Park offering 10k, 27k and 55k looped routes. The course is mostly single track with a steep ascent at Bible Point and includes a day pass, a custom hat and wool finisher socks.