Welcome to the Platte River Half Marathon & Relay race, one of the most exciting and popular races in Denver, Colorado! This race is held annually in Littleton just outside of the Denver Metro area. We’re thrilled to announce that registration for our upcoming 2025 event on Sunday, April 13th is open for the half-marathon and relay race.

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 the Leukemia & Lymphoma Society. Thank you for your support, and we can’t wait to see you at the finish line!

04-13-2025, 07:00 am - 01:00 pm