Boulder County, Colorado, United States
2.4 miles (3.9 km) · 1,537 ft elevation gain · Loop · trail · Route
The First Flatiron (Boulder, CO) route traverses 2.4 miles through Boulder County, Colorado, United States. Elevation gain totals 1,544 feet, with 1,538 feet of descent. The most significant ascent covers 1.2 miles and gains 1,510 feet. Vertical rate measures 634 feet of gain per mile. About 7% of the distance is runnable terrain. Terrain is predominantly trail. Technical difficulty: mountainous. This route ranks at the 99.74th percentile for difficulty among similar distances. The route draws trail runners and hikers interested in technical terrain in Colorado.
Preview this trail in 3D flyover, view the elevation profile, and explore the segment breakdown.
View Full Route Details →