Flagstaff Mountain
Boulder's signature climb and every local cyclist's calling card. 2.87 miles on Flagstaff Road from the Gregory Canyon junction (5,745 ft) to the summit (6,670 ft), averaging 7.1% with a max of 10.4% on the Chapman segment. The full Super Flag extension (#626263) hits 15.5% max grade and 8.2% average over 7.38 km. Chapman-Flagstaff (#3220167) has 157,565 attempts by 13,442 people — KOM belongs to John Keller at 11:43 (402W, 20.3 km/h). Keller, a former pro turned software developer, holds 502+ Strava KOMs across Boulder. Phil Gaimon targeted this in his "Worst Retirement Ever" YouTube series (Episode 8: Boulder). Pass Panorama Point (39.9975/-105.2900), Sunrise Circle Amphitheatre (40.0037/-105.3008), Realization Point (40.0010/-105.3030), and Lost Gulch Overlook (40.0005/-105.3060) before the summit.
Distance
4.6 km
Elevation Gain
281 m
Elevation Loss
12 m
Est. Time
15min
Elevation Profile
Photos
Strava Segments (2)
Chapman-Flagstaff Climb
3.95 km • 7.1% avg
282m
climb
Super Flag (to the Mailboxes)
7.38 km • 8.2% avg
603m
climb
Flagstaff Mountain
Boulder Velo Club
Distance
4.6 km
Elevation Gain
281 m
Est. Time
15min
Grade
6.1%
Boulder's signature climb and every local cyclist's calling card. 2.87 miles on Flagstaff Road from the Gregory Canyon junction (5,745 ft) to the summit (6,670 ft), averaging 7.1% with a max of 10.4% on the Chapman segment. The full Super Flag extension (#626263) hits 15.5% max grade and 8.2% average over 7.38 km. Chapman-Flagstaff (#3220167) has 157,565 attempts by 13,442 people — KOM belongs to John Keller at 11:43 (402W, 20.3 km/h). Keller, a former pro turned software developer, holds 502+ Strava KOMs across Boulder. Phil Gaimon targeted this in his "Worst Retirement Ever" YouTube series (Episode 8: Boulder). Pass Panorama Point (39.9975/-105.2900), Sunrise Circle Amphitheatre (40.0037/-105.3008), Realization Point (40.0010/-105.3030), and Lost Gulch Overlook (40.0005/-105.3060) before the summit.