Upper Infirmary Slabs
Upper Infirmary Slabs in Colorado has 14 climbing routes across 8 grades.
- 14 routes
- 5.6 – 5.11+
- Trad · Sport · Mixed
Is Upper Infirmary Slabs open right now?
Alert in the area
The Forest Service lists 3 alerts for Arapaho and Roosevelt National Forests.
Fire Restrictions
Agency alert covering Arapaho and Roosevelt National Forests · USFS · Arapaho and Roosevelt National Forests
Caribou Road Closure Order
Agency alert covering Boulder Ranger District · Order 02-10-01-26-04 · USFS · Boulder Ranger District
Raptor Nesting Area Closure - Boulder Ranger District
Agency alert covering Boulder Ranger District · Order 02-10-01-26-06 · USFS · Boulder Ranger District
As of · Source: USFS · Arapaho and Roosevelt National Forests. Agencies don't list every closure — check before you go.
Best time to visit Upper Infirmary Slabs
Best months: April–June and September–October. Best months have typical highs of 55–85 °F, lows of 30 °F or warmer (32 °F where the station doesn't record snow), at most one snowy day and no more than 12 wet days.
Jan
47° / 21°
6 wet
Feb
48° / 22°
7 wet
Mar
57° / 29°
8 wet
Apr
63° / 34°
10 wet
May
71° / 43°
12 wet
Jun
83° / 51°
10 wet
Jul
88° / 57°
11 wet
Aug
86° / 55°
10 wet
Sep
79° / 48°
8 wet
Oct
66° / 37°
7 wet
Nov
54° / 28°
6 wet
Dec
46° / 21°
6 wet
Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Boulder, CO, 14 mi away at 5,484 ft. The station sits about 700 ft lower than this place, so expect it a little cooler here. This station doesn't record snowfall. Source: NOAA NCEI U.S. Climate Normals 1991–2020.
Upper Infirmary Slabs is a climbing area in the Boulder Ranger District of the Arapaho and Roosevelt National Forests in Colorado, about a tenth of a mile from the Infirmary Slabs and the Lower Infirmary Slabs. For comfortable conditions, aim for late spring or early fall. Typical averages from a nearby weather station in Boulder show May highs around 71°F and September highs around 79°F, with July peaking near 88°F. The station sits about 700 feet lower than the slabs, so temperatures up top run cooler. The Spire, The is also about a tenth of a mile away. Coffintop is 0.2 miles off, and Button Rock Trail is about 2 miles away. Peaceful Valley Campground lies roughly 10 miles from the area.
Routes (14)
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