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Half Marathon Calendar near Castle Rock 2025-2026

Explore the top half marathons near Castle Rock for 2025-2026! We've gathered 25 exciting races in the area. Check out our detailed list below to find your next local race.

May 2026
May
23
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
June 2026
Jun
20
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
July 2026
Jul
4
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Jul
18
Saturday

Summer Splash Prairie Dog Half

5 km 10 km Half Marathon
September 2026
Sep
7
Monday

Labor Day Half Marathon

5 km 10 km Half Marathon
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