Lower Infirmary Slabs
Lower Infirmary Slabs in Colorado has 6 routes across 4 grades with mixed, sport, and trad climbing.
- 6 routes
- 5.7 – 5.10b
- Sport · Mixed · Trad
Is Lower 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 Lower 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, 13.9 mi away at 5,484 ft. The station sits about 500 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.
Lower Infirmary Slabs is a climbing area in the Boulder Ranger District of the Arapaho and Roosevelt National Forests in Colorado, about 14 miles from Boulder. It sits close to the Infirmary Slabs and Upper Infirmary Slabs climbing areas, as well as the Spire climbing area, all within about a tenth of a mile. The Coffintop hike starts just 0.2 miles away. The most comfortable months for a visit are typically late spring and early fall. Typical averages from a nearby weather station in Boulder show May highs around 71°F with lows near 43°F, and September highs around 79°F with lows near 48°F. July is the warmest month, with highs averaging about 88°F. Other places to explore in the area include the Button Rock Trail hike about 2 miles away, South Saint Vrain Creek for canoeing about 6 miles out, and Peaceful Valley Campground about 10 miles away.
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