Platte River Half-Marathon, Relay & 5k
About this race
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. The race starts and finishes next to the beautiful Platte River Trail and adjacent to the popular Breckenridge Brewery campus. Join us for an epic post-race party at the Brewery with food, vendors, live music, and of course beer!
Whether you’re an experienced runner looking to set a new PR, a newcomer looking to tackle your first half-marathon, or a team of runners wanting to run an exciting relay race, join us for a day of adrenaline-pumping running, scenic views, and all-around fun. What’s more, we donate a portion of the proceeds to Salute Colorado. Thank you for your support, and we can’t wait to see you at the finish line!
Questions? Visit our race website here.
Entry fees are non-refundable and non-transferable. There are no deferrals to future years.
Pick your distance
Running
2027 Half Marathon
2027 Half Marathon Relay
2027 5k
Typical race-day weather
Based on 9 years of Open-Meteo archive data for this event's race dates in Littleton, plus the 3 days either side.
The sun rises at 6:34 AM and sets at 7:29 PM local time (MDT) in Littleton on April 7, 2027 — 12h 55m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
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Results — Platte River Half-Marathon, Relay & 5k
Other races near Littleton
Different organizers, within 40 miles, in the next three months
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Kipling Villas 5K -
Your Story Isn't Over 5k/10k/Kids 1-Mile
Witch Paddle
🏃 Plan Your Next Race in Littleton
Find upcoming events by distance:
- Littleton 5K Races 25 races
- 10K Run Events in Littleton 7 races
- Littleton Half Marathons 6 races
- Littleton Running Calendar 2026 29 races
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 34 Littleton events
Spotted something wrong? Tell us and we'll fix it.