Platte River Half Marathon
Where the 2027 race is now
- RegistrationOpen when last checked August 14, 2026Check registration
- Race daySunday, April 11, 2027
- ResultsPosted here as soon as the timer has them
- Race day
- Apr 11, 2027 Sunday
- Distance
- 13.1 mi Half marathon
- Entry
- Open? As of August 14
- Boston qualifier
- n/a
- Live tracking
- Not yet Shown here race week
- Latest results
- None yet After race day
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.
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.
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.
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.
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