Boulder Rez Half
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Event overview
The Boulder Rez race weekend takes place at Boulder Reservoir in Boulder, Colorado on April 11, 2026. The event offers a Half Marathon, a 10K and a 5K, plus a Half Marathon relay option. Registration fees vary by date: Half Marathon $70–$100, 10K $45–$70, 5K $40–$60, Half Marathon relay per person $40–$70. The Half Marathon course is USAT certified.
Course and race format
The courses loop around Boulder Reservoir and are mostly on dirt trails. The course is described as flat with about 200 feet of elevation gain. The Half Marathon completes two loops, the 10K completes one loop, and the 5K uses a different route. The race features measured, clearly marked courses and timing with published results.
Logistics and awards
Packet pickup is available the day before at Fleet Feet Boulder and on race morning at the reservoir parking lot. Participants receive a 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+. Volunteers of all ages are welcome; volunteers under 13 must be accompanied by a parent or guardian. Visit the organization's website for the most recent information.
