Boulder Rez Half Marathon, 10K And 5K Run

Boulder Rez Half Marathon, 10K And 5K Run
Saturday, Apr 15, 2023 at 8:00am
Boulder Reservoir
5565 N 51st Street

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.

The run course loops around the Boulder Reservoir and remains mostly on dirt trails. The course is flat with only 200 feet of elevation gain. You will experience iconic views of the mountain range to the west.

The Half Marathon will complete 2 loops, and the 10K will complete one loop. 5K runners will take a different course route.


6:30am - 8:00am: Packet Pick Up & Registration
8:00am: Start of Half Marathon
8:05am: 10K Start
8:10am: 5K Start
9:15am: 5K Awards
9:00am: Post Race Meal Begins
9:15am: 10k Awards
10:00am*: Half Marathon Awards
11:30am: Course Closed
*Award times are approximate

Race Features

Scenic, USATF sanctioned course
Early & Race Day Packet Pick Up Options
Accurately measured, clearly marked courses
Reliable, Accurate Results
Participant Shirt
Finisher Medal


Overall Top 3 Male & Female
Age Groups: 19 & Under; 20-29; 30-39; 40-49; 50-59; 60-69; 70-79; 80+

Click Here for Registration