For the challenging half marathon, participants start with a 1.7-mile east dogleg before turning west on the trail to the scenic 5.4-mile clockwise loop around Blunn Reservoir, before finally returning to the Ralston Creek Trail for a rewarding downhill finish. To ensure a great race, the course is supported by 7 aid station stops and 5 toilet stops along the route.

Surface: <1% soft surface/<1% asphalt/99% concrete
Male record: David Foreman, 2026 Runapalooza, 1:27:22 (6:40)
Female record: Karli Leitz, 2026 Runapalooza, 1:34:45 (7:14)
Course average: 2:11:20 (10:02)
Avg. # of athletes: 88

Aid stations have Eldorado natural spring water, Gatorade (yellow, red, and blue), and Gu gels for all athletes that wish one