Colorado's flattest 50K, built for fast times and lake views
Other trail races within 49 miles
The Barr Lake Trail Race 50K is one of Colorado's flattest ultramarathons, sending runners on three loops around Barr Lake's scenic shoreline dirt trail. With less than 500 feet of total elevation gain over 31.6 miles, this course is purpose-built for PRs — not sufferfests. Continuous views of the lake and the snow-capped Front Range keep the miles rolling by at Barr Lake State Park in Brighton.
Suitable for first-timers
Brighton, CO, United StatesJune 13, 2026
| Location | Mile | Elevation |
|---|---|---|
Start / Finish Start | 0.0 | 5,098 ft |
50K Turnaround Checkpoint | 2.0 | 5,102 ft |
Start / Finish Aid Station | 4.0 | 5,098 ft |
Lark's Lounge Aid Station | 7.0 | 5,102 ft |
O'Brian's Oasis Aid Station | 10.3 | 5,098 ft |
Start / Finish Aid Station | 13.1 | 5,098 ft |
Lark's Lounge Aid Station | 16.1 | 5,102 ft |
O'Brian's Oasis Aid Station | 19.4 | 5,098 ft |
Start / Finish Aid Station | 22.3 | 5,098 ft |
Lark's Lounge Aid Station | 25.3 | 5,102 ft |
O'Brian's Oasis Aid Station | 28.6 | 5,098 ft |
Finish Finish | 31.5 | 5,098 ft |
Sign in to see cutoffs, crew access, drop bags, and services for every aid station.
Open, exposed lakeside course offers little shade — sun protection essential
Afternoon thunderstorms are possible in Colorado in June on exposed terrain
No required gear specified
No recommended gear specified
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