Platte River Half Marathon & Relay Race Registration

Register for this thrilling half-marathon and relay race in Littleton — secure your spot today!

Secure Your Spot at the Platte River Half Marathon & Relay

Welcome to the Platte River Half Marathon & Relay’s race registration page! Our race in Littleton is an adrenaline-pumping event that brings together running enthusiasts from around the city and beyond! Set in the cozy suburb of Littleton, CO, our race is more than just a run — it celebrates endurance, community, and the beautiful scenery along the Platte River Trail.

Join us on Sunday, April 14, 2024, for an exciting day of running through Littleton’s natural landscapes, followed by our legendary post-race party where you can celebrate your victory with fellow runners, family, and friends! Register today to secure your spot at the best rates!


Race Registration Details & Pricing

Whether you’re gunning for a new personal best, tackling your first half-marathon, or teaming up for an exhilarating relay race, our half-marathon and relay race in Littleton offers an experience you won’t want to miss! Enjoy a scenic course that promises a fun and thrilling challenge with a community of passionate runners.

Platte River Half Marathon winner


  • Super Early Bird Special (10/24/23 – 10/31/23): $65
  • 11/01/23 – 12/31/23: $75
  • 01/01/24 – 02/29/24: $85
  • 03/01/24 – 04/10/24: $100
  • Race Week (if not sold out): $110


Platte River Half Marathon relay team

Relay Race

  • Super Early Bird Special (10/24/23 – 10/31/23): $145
  • 11/01/23 – 12/31/23: $165
  • 01/01/24 – 02/29/24: $185
  • 03/01/24 – 04/10/24: $205 – SOLD OUT!
  • Race Week (if not sold out): $225 – SOLD OUT!


Please note: This annual event is capped at 2,900 half-marathoners and 100 relay teams. Entry fees are non-refundable and non-transferable, and deferrals are not allowed. Register early to save your spot in the race!


Male race participant stoked at how easy race registration is

Why Run With Us?

There are so many awesome reasons to run the Platte River Half Marathon & Relay; here are a few!

  • Be a part of one of Denver’s oldest half-marathons.
  • Support a great cause with a portion of proceeds going to the Leukemia & Lymphoma Society.
  • Choose your adventure with both half-marathon and relay race options available.
  • Celebrate your achievement with an epic post-race party at Breckenridge Brewery in Littleton.
  • Enjoy awesome swag for participating in the races.
  • Connect with other runners and make new friends during your journey to the finish line.
  • Bring your friends and family to run alongside you or cheer you on during the race.
  • Join other running enthusiasts in celebrating fitness, wellness, community, and adventure.
  • Support our sustainable racing initiative with HydraPak Speed Cups to help keep the South Platte River and our course clean.


Race Registration Made Easy

The Platte River Half Marathon & Relay is passionate about being environmentally conscious. To align with this commitment, we provide online registration only. This helps reduce paper waste and preserves resources, ensuring our event is as eco-friendly as our scenic course.

Join the out-and-back half-marathon or assemble your ultimate team for the three-person half-marathon relay. Race registration is simple and easy! Click on the registration link to access registration through EnMotive. Select your preferred race, sign up, and that’s it! Easy peasy. We’ll email you all the details for this year’s event so you’re ready for race day. In the meantime, explore our race information page to learn about each course, parking, aid station locations, and more!

Two female runners celebrating victory

Register for the Platte River Half Marathon & Relay Today!

Don’t miss out on this exciting race experience in the beautiful city of Littleton. Whether it’s for the love of running, enjoying the outdoors, celebrating the community spirit, or supporting a great cause, there’s something for everyone to look forward to. See you at the starting line!

Our Sponsors

Interested in Sponsorship opportunities with the Platte River Half Marathon & Relay? Become a Sponsor