Summer Splash Prairie Dog Half, 10k, & 5k
Updated
Saturday, July 17, 2027, first start 6:30 AM, in Castle Rock (5254 N Meadows Dr). Distances: 5K, 10K, Half marathon. Entry from $39 to $74; the Half marathon goes from $74 to $79 after April 18.
- Date
- Saturday, July 17, 2027
- Start time
- 6:30 AM (earliest wave)
- Location
- 5254 N Meadows Dr, Castle Rock, CO 80109
- Area
- Denver Suburbs, Denver & Boulder
- Distances
- 5K10KHalf marathon
- Course
- Trail (dirt or single-track on at least part of the course)
- Price
- $39 to $74 plus the platform's processing fee
- Next price increase
- Sunday, April 18, 2027: Half marathon $74 → $79
- Registration
- Open. Opened August 1, online signup closes Saturday, July 17, 2027
How to register
Registration is on RunSignup. Pick your distance, add any extras, and you'll get a confirmation email with your bib details. Sign up by April 18 to pay $74 instead of $79.
Course and race notes
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)!
From the race's own listing. Check the race website for the course map and parking.
Source: RunSignup public race API, refreshed 2026-10-17. Details can change; the registration page is the final word.