Effort: hard
Computed from length and climb: up to about 4.5 hours one way and 3,000 ft of climbing. Not an official difficulty.
12 trails in Boulder County with this feature, longest first (trails under a quarter mile are hidden).
Arapaho Glacier Trail
7.57 miDirt1,544 ft gainMountain hikingMesa Trail
6.26 miGround928 ft gainDifficulty unknownPawnee Pass
5.43 miGround1,438 ft gainMountain hikingBeaver Creek Trail
5.04 miGround1,613 ft gainMountain hikingThunder Lake Trail
4.46 mi1,767 ft gainDifficulty unknownSandbeach Lake Trail
4.21 miGround2,009 ft gainDifficulty unknownButton Rock Mountain Trail
3.20 mi1,690 ft gainDifficulty unknownCaribou Pass Trail
2.96 miDirt1,665 ft gainMountain hikingStorm Gulch
2.29 miGround1,846 ft gainDemanding mountain hikingMount Audubon Trail
2.13 miGround1,818 ft gainDifficulty unknownShadow Canyon Trail
1.16 miGround1,579 ft gainDifficulty unknownFern Canyon Trail
0.95 miGround1,718 ft gainMountain hiking
Data © OpenStreetMap contributors (ODbL); elevation from USGS 3DEP. Features can be missing or out of date.