Platte River Half-Marathon, Relay & 5k
Updated
Sunday, April 11, 2027, first start 7:00 AM, in Littleton (6745 S. Santa Fe Dr.). Distances: 5K, Half marathon. Entry from $45 to $175; the Half marathon goes from $80 to $90 after November 1.
- Date
- Sunday, April 11, 2027
- Start time
- 7:00 AM (earliest wave)
- Location
- 6745 S. Santa Fe Dr., Littleton, CO 80120
- Area
- Denver Suburbs, Denver & Boulder
- Distances
- 5KHalf marathon
- Course
- Trail (dirt or single-track on at least part of the course)
- Price
- $45 to $175 plus the platform's processing fee
- Next price increase
- Sunday, November 1, 2026: Half marathon $80 → $90
- Registration
- Open. Opened July 1, online signup closes Sunday, April 11, 2027
How to register
Registration is on RunSignup. Pick your distance, add any extras, and you'll get a confirmation email with your bib details. Sign up by November 1 to pay $80 instead of $90.
Register on RunSignup →Race website
Course and race notes
Welcome to the Platte River Half Marathon, Relay & 5k race, one of the most exciting and popular races in the Denver Metro Area! This race is held annually in Littleton, CO. We’re thrilled to announce that registration for our upcoming 2027 event on Sunday, April 11th is open for the half-marathon and relay race.
From the race's own listing. Check the race website for the course map and parking.
Source: RunSignup public race API, refreshed 2026-10-17. Details can change; the registration page is the final word.