All-Out Kooky-Spooky 1M, 5K, 10K and Half Marathon

All-Out Kooky-Spooky 1M, 5K, 10K and Half Marathon takes place in Golden, Colorado, on November 1, 2026, based at the NAAC stadium in Jefferson County with the Colorado foothills as a backdrop. The half marathon (13.1 miles) starts at 9:00 a.m., the 10K at 9:30 a.m. and the 5K at 9:45 a.m. Courses run along the Arvada Blunn Reservoir via the Ralston Creek Trail. There is a Halloween costume contest alongside the racing, and the end of daylight saving time hands everyone an extra hour beforehand.

Falling back an hour the night before is a small but real advantage, so use it for sleep rather than a late night. Path-based courses like these tend to be steady underfoot and suit even pacing. Altitude here is significant for visitors, so plan on a slightly slower target than your home times.