Second Flatiron Roundtrip via Freeway

Boulder County, Colorado, United States

2.3 miles (3.7 km) · 1,120 ft elevation gain · Loop · trail · Route

Second Flatiron Roundtrip via Freeway covers 2.3 miles across Boulder County, Colorado, United States. Runners face 1,120 feet of climbing with 1,165 feet of loss. The longest climb spans 1.1 miles with 1,138 feet of gain. Elevation gain averages 481 feet per mile. The course is 5% runnable, with the remainder requiring hiking on steep or technical sections. Trail comprises the majority of the course. The course features mountainous terrain. The course difficulty of 25.4 puts it in the top 8.489999999999995% of challenging routes at this distance. Popular among trail runners and hikers seeking Colorado adventures.