Runners follow an out-and-back course for the Geist Half Marathon, which starts and finishes on the Olio Road bridge and, in between, unfolds along the roads that wind along the Geist reservoir. Throughout the early and middle stretches of the race, participants encounter numerous rolling hills, but no major hills. The final stretch of the race takes runners back over the Fall Creek Road bridge, and then to the finish line on Olio Road.
(MORE: Geist Half Marathon event details)