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Boulder Rez Marathon

Name: Boulder Rez Marathon
Start: 2026-08-15
End: 2026-08-15
Location: Boulder

Boulder, United States • 15 Aug 2026

Boulder Rez Marathon 2026

The event takes place at Boulder Reservoir in Boulder, Colorado (80301). The running course follows the reservoir shoreline and is routed mostly on dirt roads and trails. The route is relatively flat, with about 200 feet of total elevation gain, and offers views of the Boulder Reservoir and the Rocky Mountains.

Distances and entry types offered at the event include:

10K Run
Half Marathon
3/4 Marathon
Marathon
Marathon Relay (captain and member entries)

The event program includes packet pick up and registration, awards presentations, and a course closure later in the day. The race is organized by BBSC Endurance Sports. Pricing and availability vary by distance and entry type. Visit the organization's website for the most recent information.

United States Colorado Boulder

Race information

Website Registration

Marathon

Marathon Relay

Marathon

32 km

3/4 Marathon

Half Marathon

10 km

10k

Visit the organization's website for the most recent information.

Trail runs nearby

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Evergreen Trail Race Series

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The Evergreen Trail Race Series will take place in Evergreen on Saturday 25 July 2026. You can run between 5 and 10 miles.

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Westminster Night Trail

...

Trail races around Standley Lake in Westminster, CO, with five distances on packed dirt trails and lake and mountain views. Organized by Aravaipa Running; registration closes Aug 10.