In 187 days · Sun, Apr 11, 2027
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Sunday, April 11th, 2027
6745 S. Santa Fe Dr., Littleton CO
Half · 5K
33–62°F · low rain risk
See last 10 years
On this date: rain 0 of the last 10 years
2026
49–78°F
dry
2025
37–80°F
dry
2024
32–61°F
dry
2023
44–85°F
dry
2022
30–66°F
dry
2021
36–54°F
dry
2020
38–70°F
dry
2019
19–38°F
dry
2018
44–77°F
dry
2017
28–68°F
dry
Best months to race in Colorado →
Race-day forecast says layers
33°F at the start.
Gloves, ear warmers, throwaway layers, hand warmers — delivered before race day.
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.
Course map
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