Caribou County, Idaho, United States
37.4 miles (60.2 km) · 8,626 ft elevation gain · Loop · trail · Route
The Portneuf Boundary Trail route traverses 37.4 miles through Caribou County, Idaho, United States. Elevation gain totals 8,626 feet, with 8,738 feet of descent. The largest climb extends 6.5 miles, gaining 972 feet. The course averages 233 feet of vertical gain per mile. About 51% of the distance is runnable terrain. Terrain is predominantly trail. Terrain difficulty is rated as mountainous. Difficulty is rated 29.6 out of 10, placing it in the 94.09th percentile. The route draws trail runners and hikers interested in technical terrain in Idaho.
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