Summer Splash Prairie Dog Half, 10k, & 5k
Castle Rock's Summer Splash Prairie Dog Half offers a flat, fast course with minimal elevation change.
Race Date
Jul 18, 2026
Location
Castle Rock, CO
Quick facts
- Date
- Saturday, July 18, 2026
- Location
- Castle Rock, Colorado
- Distance
- Half marathon (13.1 mi) + 10K, 5K
- Course
- Loop Course
- Terrain
- Road
- USATF certified
- Not listed
- Finishers on record
- 1,953
Highlights
Good For
Atmosphere
Course
The Experience
The Summer Splash Prairie Dog Half, 10k, and 5k takes place in Castle Rock, Colorado, offering a straightforward racing experience. Held in July, the event utilizes the East Plum Creek Trail for its course, promising a predominantly flat profile with minimal elevation gain or loss.
This race, now in its 12th edition, typically sees around 170 finishers, drawing participants from approximately 17 states. While the field size has trended downward, it remains a consistent option for those seeking a simple, accessible half marathon. The event includes a 10k and 5k option, making it suitable for a range of running abilities.
Runners can expect a race shirt as their giveaway. The typical winning time hovers around 80 minutes, indicating a course that is conducive to faster times for competitive runners. The event aims to provide a clear and uncomplicated race day for participants.
Race-provided description
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)!
Logistics
Race Day
Saturday, July 18, 2026
Start Time
6:30 AM
Giveaway
Shirt
Start Location
5254 N Meadows Dr, Castle Rock, CO, 80109
Course Info
Course Type
Loop Course
Terrain
road
Scenery
Park
Surface
Paved
Difficulty
Ultra-Flat
Net Drop/km
0 m (Flat)
Separation
0.0%
Also Offers
Course Map
Quality Score
Solid Pick6012 years running
~237 finishers a year
shrinking
8% returning runners
5 timing sources · 3 photos
runners from 17 states
winner 1:20:25
typical high 86°F
Race Day Weather
5-year historical avgStart (Low)
57°
Afternoon (High)
86°
Hot conditions — adjust pace expectations, prioritize hydration
0.1"
Precipitation
11 mph
Wind
50%
Humidity
Historical Finish Times
How 1,953 finishers actually crossed the line across 12 years.
Most recent
2025
Total finishers
1,953
Median time
2:12:29
Latest turnout
170
States
39
Turnout by year
2018–2025
Hover the histogram to inspect specific finish times.
Race Photos
Frequently asked
When is the Summer Splash Prairie Dog Half, 10k, & 5k?
The Summer Splash Prairie Dog Half, 10k, & 5k is held on Saturday, July 18, 2026, starting at 6:30 AM.
Where does the Summer Splash Prairie Dog Half, 10k, & 5k take place?
It takes place in Castle Rock, Colorado.
What distances does the Summer Splash Prairie Dog Half, 10k, & 5k offer?
The half marathon (13.1 miles), plus 10K, 5K.
Is the Summer Splash Prairie Dog Half, 10k, & 5k course flat and good for a PR?
The Summer Splash Prairie Dog Half, 10k, & 5k is a ultra-flat, loop course course.
How many people run the Summer Splash Prairie Dog Half, 10k, & 5k?
HalfRuns has finish records for 1,953 runners who have completed the Summer Splash Prairie Dog Half, 10k, & 5k.
HalfRuns editorial — independent, no paid placement.
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