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  • Distance: 6.8 km from Castle Rock
    Sat, Jul 18, 2026 at 6:30 AM

    Welcome to the Summer Splash Prairie Dog Half, 10k & 5k in Castle Rock, Colorado. Part of the Prairie Dog Half race series, join us in July as we race through Castle Rock along the East Plum Creek Trail.

    For all race info, click the "race info" tap (or the links at the bottom)!

    5k10k13.1 MilesRunTrail via RunSignup
  • Distance: 19.4 km from Castle Rock
    Wed, Jul 29, 2026 at 5:00 PM

    The Highlands Ranch Mountain Bike (MTB) Series takes place on four Wednesdays throughout May-August. Each Wednesday night features a different route. All four races take place in our beautiful and pristine Backcountry Wilderness Area, with the first three taking place on our Highlands Point Trail System and the fourth on our Wildcat Mountain Trail System.

    Mountain bike racers of all abilities are welcome! All categories are for men and women.

    This course consists of two 5.5-mile loops running counter-clockwise for a total length of 11 miles. Total ascent of 764 feet and a maximum elevation of 6,230 feet.

    Course map: https://www.strava.com/routes/17155580

    5:00 pm - Juniors 10-14 race 1-lap course

    6:00 pm - all other race classes race 2-lap course

    See full details
    Mountain BikingRunTrail via RunSignup
  • Distance: 22.3 km from Castle Rock
    Sat, Aug 01, 2026 at 8:00 AM

    Ready to get off the sofa and gallop around Highlands Ranch with some friends? Yeah, you are! Come frolic with us at the Unicorn Runner 5k in Highlands Ranch to finish off your summer! You'll earn a sweet tee shirt and a flashy unicorn finisher medal!

    It's a 5k distance for all, and whether you walk, trot, canter or gallop, we'll be happy to see you! This event also features a shorter saunter for those not quite ready to enjoy a full 5k! The untimed 3/4 mile run is long enough to get your heart rate up and be a 'real run' without being a sprint!

    Costumes are encouraged!

    The Balloon Guy will be back this year- creating balloon creations for all!

    Remember to refer your friends and you can earn back up to $20 back from your registration fee. Also - teams of 5 or more in the 5k each get $5 off their registration. So form a group and get your buddies to join you today!

    All the info you need about this event is found on this site - click the menu bar or scroll to the bottom to see a listing of all page links!

    If you're looking for the Blessing of Unicorn running early in the summer on the north side of town, CLICK HERE for the Thornton event! CLICK HERE for the DENVER-East Side Event in the spring.


    All participants receive:

    • Gender-Specific Event Shirt!

    • 1 Free Cotton Candy

    • FREE Photo downloads

    • FREE Balloon Animals/Designs

    • FREE Face Painting

    5k Participants ALSO receive

    • Finisher's Medal!

    • Chip Timed Finish

    See full details
    3.1 Miles5kRunWalk via RunSignup
  • Distance: 17.7 km from Castle Rock
    Wed, Aug 19, 2026 at 5:00 PM

    The Highlands Ranch Mountain Bike (MTB) Series takes place on four Wednesdays throughout May-August. Each Wednesday night features a different route. All four races take place in our beautiful and pristine Backcountry Wilderness Area, with the first three taking place on our Highlands Point Trail System and the fourth on our Wildcat Mountain Trail System.

    Mountain bike racers of all abilities are welcome! All categories are for men and women.

    Two, approximately 5.5-mile loops running clockwise for a total course length of approximately 11 miles. Total ascent of 784 feet and a maximum elevation of 6,305 feet.

    Course map: https://www.strava.com/routes/17155883

    5:00 pm - Juniors 10-14 race 1 lap course

    6:00 pm - all other race classes race 2 lap course

    See full details
    Mountain BikingRunTrail via RunSignup
  • Distance: 17.3 km from Castle Rock
    Mon, Sep 07, 2026 at 7:00 AM

    Celebrate the last blast of summer at the Labor Day Half Marathon. Sweat your socks off and let summer have its last hooray at Parker’s Salisbury Park, just a few miles southeast of Denver. There’s a distance to meet every taste with a half marathon, 10K and 5K. The race travels along the scenic banks of the Cherry Creek. This flat and fast course just might propel you to a new personal record! And if you’re in it just for the fun, well, we totally catch your drift. Runners and walkers of all abilities are welcome.

    See full details
    5k10k13.1 MilesHalf MarathonRunWalk via RunSignup
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