Races›United States›Colorado›Boulder Rez Half Marathon, 10K and 5K
Boulder, CO, seen from above
April 2027 · date to be announced

Boulder Rez Half Marathon, 10K and 5K

Boulder, Colorado · United States
RoadLakeside

Scenic Boulder spring race with glamorous finisher medals

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Course

The half marathon runs two loops around Boulder Reservoir, the 10K a single loop, and the 5K uses a separate route. The course is flat, with roughly 200 feet of climb, and stays mostly on dirt trails with views west to the mountains. All distances start and finish at Boulder Reservoir.

Half Marathon21.1 km
10K10 km
5K5 km

Key dates

Provisional date, projected from last year — the organiser has not announced this edition yet. We show the month only.

About

This spring race features a spectator-friendly Half Marathon, 10K and 5K course. Attracting athletes from all over the west due to its phenomenal scenery, glamorous finisher medals, perfect running temperatures with many nearby Boulder attractions to enjoy after the race.

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A confirmed date shows its day; a provisional one shows only its month, because we won't claim a day we don't have. This page is rebuilt every night from the RunCalendar catalogue.