Half Marathons in Castle Rock, Colorado 2026 — MyNextRace

There are 2 half marathons in Castle Rock, Colorado in 2026. The next is the Friday The 13K - Castle Rock MEET UP on November 13.

Fri, Nov 13 · Castle Rock, CO Castle Rock

Virtual 6.5 K13K

From $35 Open

Sat, Jul 17 · Castle Rock, CO Castle Rock

Road 5k5k10k +3

From $25 Open

Half Marathons in Castle Rock, Colorado