10 Seconds Flat

Boulder County, Colorado, United States

11.7 miles (18.8 km) · 7,056 ft elevation gain · Loop · trail · Route

Route facts

Distance	11.7 mi (18.8 km)
Elevation gain	7,056 ft (2,151 m)
Average gain	603 ft per mile (114 m per km)
Longest climb	1.2 mi, 1,200 ft of gain
Steepest climb grade	100.1%
Runnable	7% of the route
Climbs / descents	2 climbs, 1 descents
Profile shape	Rolling
Difficulty score	17.9 of 100
Surface	trail
Route shape	Loop
Type	Route

Grade breakdown

Grade band	Share of route
Mild uphill	2%
Moderate uphill	5%
Steep uphill	35%
Mild downhill	2%
Moderate downhill	3%
Steep downhill	53%

Questions about 10 Seconds Flat

How much elevation gain does 10 Seconds Flat have?

10 Seconds Flat has 7,056 ft (2,151 m) of elevation gain over 11.7 miles (18.8 km). That averages 603 ft of gain per mile.

How difficult is 10 Seconds Flat?

The difficulty score for 10 Seconds Flat is 17.9 of 100. That is harder than 88.2% of routes at a similar distance. About 7% of the route is runnable at typical trail effort; the rest is steep enough that most runners hike.

What is the longest climb on 10 Seconds Flat?

The longest climb on 10 Seconds Flat runs 1.2 miles (1.9 km) and gains 1,200 ft (366 m). The steepest climb grade on the route is 100.1%.