Boulder Sunset 10K/5K - Boulder, Colorado - Running

The Boulder Sunset 10K/5K is a Running race in Boulder, Colorado consisting of a 10K and 5K.

Come run in one of the biggest endurance sporting events of the summer, the Boulder Sunset Triathlon, Duathlon, 10K & 5K Run. Race alongside more than one thousand athletes from across the west and finish to an amazing post-race party. Register early as this race sells out in early August! Race Distances
5K Course
8:15am Start
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This out & back course is flat, fast & beautiful as you run across the Boulder Reservoir dam. There will be 2 opportunities to fuel up at or near each mile marker, preparing you for that slight downhill sprint to the finish!
10K Course
8:15am Start
?
This out & back course is flat, fast & beautiful as you run across the Boulder Reservoir dam. There will be 6 opportunities to fuel up at or near each mile marker, preparing you for that slight downhill sprint to the finish!