Boulder Rez Half
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Event overview
The Boulder Rez Half Marathon takes place at Boulder Reservoir in Boulder, Colorado on April 11, 2026. The event offers multiple race options:
- Half Marathon
- 10K
- 5K
- Half Marathon Relay (per person)
The event provides a participant shirt and a finisher medal. 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+.
Course and logistics
The run course loops around Boulder Reservoir, remains mostly on dirt trails, and has about 200 feet of elevation gain. Runners will see views of the mountain range to the west. The Half Marathon consists of two loops, the 10K completes one loop, and the 5K uses a different route. The Half Marathon course is USAT certified.
Packet pickup is available the day before at Fleet Feet Boulder and on race day at the Boulder Reservoir parking lot. Volunteers of all ages are welcome; volunteers under 13 must be accompanied by a parent or guardian during their shift. Sponsors for the event include Fleet Feet and ZOA Energy. Visit the organization's website for the most recent information.