Platte River Half Marathon
Platte River Half Marathon is a paved out and back along the South Platte through Littleton, Englewood, Sheridan and Denver with about 300 feet of total gain.
Every link above goes to the race, its timing provider, or an official registration partner. Last checked July 28, 2026.
Quick facts
- Paved out and back on the South Platte River Trail with roughly 300 feet of total ascent.
- 641 half marathon finishers in 2026 and 503 in 2025, one of the bigger Denver area spring halves.
- Start and finish sit next to the Breckenridge Brewery campus in Littleton.
- A two person relay splits the same course, and a 5K starts 15 minutes after the half.
2027 Platte River Half Marathon registration
Registration for the 2027 Platte River Half Marathon runs through the official registration page at runsignup.com.
About the Platte River Half Marathon
One of the larger spring half marathons in the Denver metro area, with 641 half marathon finishers in 2026 and 503 in 2025. A two person relay and a 5K run alongside it, but the individual half is the main event.
Course
The race starts and finishes on the Platte River Trail next to the Breckenridge Brewery campus in Littleton. The out and back route is entirely paved and follows the South Platte north through Englewood, Sheridan and Denver before turning around. Total ascent is around 300 feet, which is gentle enough that the altitude is usually the harder adjustment for visiting runners.
Race-day weather
Mid April in the Denver metro can swing hard. Starts are often in the 30s to 40s with a chance of late season snow, and the same weekend can turn sunny and 60s by the finish. Plan layers you can shed and expect thin, dry air at about 5,300 feet.
Past Platte River Half Marathon dates and results
| Year | Date | Status | Results |
|---|---|---|---|
| 2027 | Sunday, April 11, 2027 | Upcoming | — |
Platte River Half Marathon FAQ
When is the Platte River Half Marathon?
The 2027 Platte River Half Marathon is on Sunday, April 11, 2027.
How do I register for the Platte River Half Marathon?
Register for the Platte River Half Marathon through the official registration link: marathonscout.com/go/platte-river-half-marathon/register. It opens the race registration page at runsignup.com.
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