Gaspin Through The Aspens

Gaspin Through The Aspens is held in American Fork, Utah, on September 19, 2026. Three trail formats are offered: a 50-mile starting at 5:00 a.m., a 50K (31 miles) starting at 7:00 a.m., and a 25K (15.5 miles) starting at 7:00 a.m. as well. The name suggests a mountain course through aspen forest, and the early starts point to a long day for the 50-mile field.

Mountain trails in Utah mean altitude and real climbing, so treat these distances as harder than their road equivalents. The 25K is a strong midseason target for trail runners who like hills, the 50K works as a first or second ultra for runners with a solid base, and the 50-mile calls for previous ultra experience. Plan a 16- to 20-week build with a weekly long trail run, regular hill sessions and a couple of back-to-back weekends for the longer options. Power-hiking the climbs efficiently is a skill worth training, and so is running downhill on tired legs.