631 official trails lie within 25 miles of Boulder — 1,290 miles in total, 475 rated easy and 43 hard or expert. Every distance and elevation figure below is computed from the agency centerline and a 10 m elevation model, not crowd-sourced.
The biggest climb nearby gains 3,326 ft; the median trail gains 189 ft.
| Trail | Miles | Climb | Difficulty | From town |
|---|---|---|---|---|
| High Lonesome Trail | 12.6 | 2,456 ft | Expert | 24 mi |
| Buchanan Pass Trail | 9.9 | 3,304 ft | Expert | 19 mi |
| Arapaho Glacier Trail | 7.6 | 2,758 ft | Expert | 17 mi |
| East Longs Peak Trail | 5.6 | 3,326 ft | Expert | 23 mi |
| Devils Thumb Trail | 6.7 | 3,012 ft | Expert | 19 mi |
| St. Vrain Mountain Trail | 6.3 | 2,403 ft | Expert | 18 mi |
| Beaver Brook Trail | 8.2 | 1,235 ft | Expert | 21 mi |
| South Boulder Creek Trail | 4.5 | 2,706 ft | Hard | 22 mi |
| Diamond Lake Trail | 7.2 | 965 ft | Expert | 21 mi |
| Pawnee Pass Trail | 4.4 | 2,034 ft | Hard | 18 mi |
| Travois Trail | 8.8 | 717 ft | Expert | 20 mi |
| South Saint Vrain Trail | 5.7 | 1,742 ft | Hard | 14 mi |
| Niwot Ridge | 4.2 | 2,082 ft | Hard | 18 mi |
| King Lake Trail | 4.2 | 2,043 ft | Hard | 20 mi |
| Mountain Lion Trail | 6.8 | 1,286 ft | Hard | 13 mi |
| Sandbeach Lake Trail | 4.2 | 2,000 ft | Hard | 20 mi |
| Jenny Lind - Perigo | 6.4 | 1,258 ft | Hard | 18 mi |
| Belcher Hill Trail | 4.5 | 1,751 ft | Hard | 15 mi |
| Beaver Creek Trail | 5.0 | 1,595 ft | Hard | 18 mi |
| Sourdough Trail | 6.8 | 1,081 ft | Hard | 14 mi |
| Homestead Meadows Trail | 6.0 | 855 ft | Hard | 23 mi |
| Ute Trail | 3.4 | 1,442 ft | Hard | 25 mi |
| Arapaho Pass Trail | 3.0 | 1,787 ft | Hard | 20 mi |
| Walker Mountain | 3.9 | 1,545 ft | Hard | 10 mi |
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