The route includes 25 miles of single track, 6 miles of rugged, historic double track and 0.9 mile of pavement. The route travels through an assortment of climate zones, including valley oak woodland, mixed fir/pine forest, mountain prairie, and sub-alpine fir/larch forest. The trails are mostly runnable dirt singletrack, with a fair amount of hilly, rocky technical sections and a few talus fields. There are a few significant ascents, especially early in the race, mixed with rolling hills and descents later in the course.

The 100K course offers an incredible tour of Mt. Hood! The 100K course offers an incredible tour of Mt. Hood proper and its eastern backcountry. The course is a lollipop format, starting and finishing at Mt. Hood Meadows. Awe-inspiring mountain views and superb backcountry trails await along this challenging course! This is an incredibly diverse course, as runners travel through an assortment of ecological zones, including lush midsummer wildflower meadows, sub-alpine fir and larch forest, as well as a fascinating transition zone of Douglas fir/ponderosa pine forest that forms the border between western and central Oregon. Most of the course is very runnable dirt singletrack, with quite a bit of hill climbing, a few rocky technical sections and a couple loose talus fields. The Timberline Trail and Umbrella Falls Trail on Mt. Hood also have several small creek crossings as well. Spectacular views await along this challenging and unique course.