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)!
The top three men and women of each distance (based on gun time) and top three men and women in each age group (based on chip time) receive an award! Must be present to claim awards/prizes. Awards will NOT be mailed. Age groups: 10k and Half Marathon: 19 and Under, 20-29, 30-39, 40-49, 50-59, 60-69, 70-79, 80+ 5k: 0-9, 10-14, 15-19, 20-29, 30-39, 40-49, 50-59, 60-69, 70-79, 80+
13.1 Miles: Shirt
10K: Shirt
5K: Shirt
| Distance | Price | Opens | Closes |
|---|---|---|---|
| 13.1 Miles | $65.00 | Aug 1 | Sep 1 |
| $75.00 | Sep 1 | Dec 1 | |
| $80.00 | Dec 1 | Jun 1 | |
| $85.00 | Jun 1 | Jul 5 | |
| $90.00 | Jul 5 | Jul 17 | |
| $95.00 | Jul 17 | Jul 18 | |
| 10K | $35.00 | Aug 1 |
| Year | Finishers | Median Time | Fastest Time |
|---|---|---|---|
| 2025 | 122 | 1:06:34 | 34:58 |
| 2024 | 94 | 1:03:58 | 37:52 |
| 2023 | 58 | 1:03:34 | 44:08 |
| 2022 | 72 | 1:02:12 | 44:32 |
| 2021 | 71 | 1:08:42 | 44:19 |
| 2019 | 89 | 1:04:26 | 42:12 |
| 2018 | 56 | 1:04:37 | 42:39 |
| 2017 |
Interested in this race?
| Sep 1 |
| $45.00 | Sep 1 | Dec 1 |
| $50.00 | Dec 1 | Jun 1 |
| $55.00 | Jun 1 | Jul 5 |
| $60.00 | Jul 5 | Jul 17 |
| $65.00 | Jul 17 | Jul 18 |
| 5K | $25.00 | Aug 1 | Sep 1 |
| $35.00 | Sep 1 | Dec 1 |
| $40.00 | Dec 1 | Jun 1 |
| $45.00 | Jun 1 | Jul 5 |
| $50.00 | Jul 5 | Jul 17 |
| $55.00 | Jul 17 | Jul 18 |
Don't stand in line on race morning! Come say hello and pick up your packet early. And yes, you may pick up packets for your friends and family. Simply have their QR code/email with you on your phone or printed. Date*: July 16,2026 Time: 4:00 - 7:00 pm Location*: RNK Castle Rock Address: 440 4th Street, Castle Rock CO 80236 These are the only dates for ADVANCED packet pick up. You are welcome to send a friend or family member to pick up your packet for you. If you cannot attend advanced pack
There is ample parking at the Castle View High School and Castle Rock Middle School. There is NO ENTRY via Sabercat Way, but all other entrances and exits to the parking areas are open and usable.
July 18, 2026 (SATURDAY) 5:30 - 6:30 AM Same day registration and late packet pick up 6:00 - 10:00 AM Expo Open 6:30 AM Half Marathon Start 7:00 AM 5k & 10k Start 7:45 AM 5k Awards 8:00 AM OVERALL 10k and Half Marathon Awards 8:30 AM 10k Age Group Awards 8:45 AM Half Marathon Age Group Awards 10:00 AM Finish Line Closes
| 55 |
| 1:04:29 |
| 37:19 |
| Year | Finishers | Median Time | Fastest Time |
|---|---|---|---|
| 2025 | 136 | 36:20 | 18:59 |
| 2024 | 97 | 37:24 | 19:00 |
| 2023 | 102 | 34:44 | 18:24 |
| 2022 | 81 | 35:08 | 22:55 |
| 2021 | 50 | 35:14 | 22:16 |
| 2019 | 74 | 35:39 | 18:04 |
| 2018 | 69 | 37:45 | 20:06 |
| 2017 | 88 | 37:34 | 18:51 |
| Year | Finishers | Median Time | Fastest Time |
|---|---|---|---|
| 2025 | 170 | 2:12:34 | 1:20:26 |
| 2024 | 138 | 2:10:15 | 1:20:49 |
| 2023 | 120 | 2:15:12 | 1:22:10 |
| 2022 | 155 | 2:13:49 | 1:22:47 |
| 2021 | 157 | 2:18:06 | 1:14:56 |
| 2019 | 171 | 2:12:44 | 1:27:45 |
| 2018 | 175 | 2:24:22 | 1:28:28 |
| 2017 | 210 | 2:19:21 | 1:30:50 |