Thornton Lakes Trail is a round-trip hike of 9.1 mi / 14.6 km near Marblemount. Expect about 2,539 ft / 774 m of elevation gain, with a high point of 5,020 ft / 1,530 m. Difficulty: Moderate. At an average pace, plan on about 5 hr 11 min.
Elevation profile
Along the route: low 2,510 ft / 765 m · high 5,000 ft / 1,524 m