The small town atmosphere with wide open spaces make Castle Rock a great place to run. We'll start downtown and tour the town before retreating to the East Plum Creek Trail for a shady run by the creek.Not up for a traditional 13.1? The shorter 5 mile race follows the best parts of the half marathon but cuts the distance. You'll love this run. Ready for a challenge? Want to Run the Rock? We are proud to present the Rock Challenge for all you adventurers out there. This race adds the steep ascent and descent of our beloved town monument, the Rock, to the first half of the 5 mile distance, making it a thigh burning wake up call.NEW THIS YEAR - Run 4 the Blue, a 4-Mile option as part of our partnership with Colorado Fallen Hero Foundation! The 4 Mile was specifically chosen to represent our partnership with Colorado Fallen Heroes Foundation but all all distances support our local heroes, so join us and BACK the BLUE!!