Boulder Rez Half Marathon
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Boulder Rez Half Marathon
The Boulder Rez event offers a Half Marathon, 10K and 5K held at Boulder Reservoir in Boulder, Colorado on April 11, 2026. The run course loops around the reservoir and is mostly on dirt trails. The course is largely flat with about 200 feet of elevation gain and provides views of the mountain range to the west.
The Half Marathon completes two full loops of the course, the 10K completes one loop, and the 5K follows a different route. The Half Marathon course is USAT certified. Courses are described as accurately measured and clearly marked. Participants receive a shirt and a finisher medal, and official results are provided.
Packet pickup is available the day before at Fleet Feet Boulder and on race morning at the Boulder Reservoir finish area. There are award categories for overall top three male and female finishers and age-group awards for 19 and under, 20-29, 30-39, 40-49, 50-59, 60-69, 70-79, and 80 plus. Volunteer opportunities are available; volunteers under 13 must be accompanied by a parent or guardian during their shift.
Distances Visit the organization's website for the most recent information.
- Half Marathon (two loops)
- 10K (one loop)
- 5K (separate route)
- Half Marathon Relay per person
