"The Boulder 20". Lying in the backyard of Boulder, Colorado, this peak challenge is a rite-of-passage for anyone in the Boulder area. Includes popular trailed peaks such as Green Mountain, Bear Mountain, and Mount Sanitas, but also less-visited peaks off the beaten path like Dinosaur Mountain and Shirttail Peak.
Highest peak
Thorodin Mountain
10,540 ft / 3,212 m
Most prominent peak
Thorodin Mountain
1,480 ft / 451 m prom
Most summited peak
Bear Peak
129 summits
Most difficult peak
Sugarloaf Mountain
Class 1
Difficulty breakdown
Class 1/2 1 peak
Class 3/4 1 peak
Highlights
Latest summits
"Quick leg up with Owen to check out Sacred Cliffs. Always a lovely view from the peak. Snow was manageable without traction but had to take it slow on some parts of the downhill." — benyboy • Jan 3, 2024
"1. Passed on the way up to Dinosaur Mountain. Didn't climb on the rocks past the fence.
2. Managed to tag this one! Sharp rock peak on the stratum west of dum (with the flat balanced rock). Super fun scramble/routefind up from Mallory Cave." — benyboy • Nov 10, 2023
"1. Passed on the way up to Dinosaur Mountain. Didn't climb on the rocks past the fence.
2. Managed to tag this one! Sharp rock peak on the stratum west of dum (with the flat balanced rock). Super fun scramble/routefind up from Mallory Cave." — benyboy • Nov 10, 2023
"Day hike with Zander. 3rd and last route up Bear Peak. Started late due to oversleeping after Men I Trust concert in Denver so we finished the descent and return in the dark. Good time overall though." — benyboy • Oct 24, 2023
"1. Part of Skyline Traverse with Amit
2. 2nd peak in the Boulder Skyline Traverse with Amit. Nice view of the divide. Ate some pbj for our 2nd breakfast at 8:50am.
3. Part of Skyline Traverse with Amit
4. 4th peak in Boulder Skyline Traverse. Hard to discern the true peak, but we tagged multiple high points for confidence.
(5. A fifth unlogged peak was Sanitas Mountaineer Top on the Peakbagger Database)" — benyboy • Jun 6, 2023