Cornerstone Boulder
Cornerstone Boulder in California has 5 bouldering routes with pads.
- 5 routes
- V0 – V1+
- Bouldering
Best time to visit Cornerstone Boulder
Best months: October–May. 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
70° / 44°
7 wet
Feb
70° / 45°
7 wet
Mar
72° / 47°
6 wet
Apr
75° / 50°
4 wet
May
80° / 55°
2 wet
Jun
87° / 58°
1 wet
Jul
94° / 63°
1 wet
Aug
97° / 64°
0 wet
Sep
93° / 61°
1 wet
Oct
82° / 55°
2 wet
Nov
76° / 47°
3 wet
Dec
69° / 43°
5 wet
Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Riverside Citrus Exp, CA, 2.1 mi away at 986 ft. Source: NOAA NCEI U.S. Climate Normals 1991–2020.
Cornerstone Boulder is a climbing area in Mount Rubidoux Park, a city-managed park in California. The land is classified as city land, and the park is home to several other climbing spots, including Borson's Wall and Half Dome Boulder, both about 0.1 mile away. Spring and fall bring the most comfortable conditions. Typical averages from a nearby weather station show April highs around 75°F and October highs around 82°F. Summer is hot, with August highs near 97°F, while winter stays mild, with lows in the mid-40s. For more time outdoors in the park, the Park path is about 2.3 miles away and the Gage Canal Path about 3.6 miles. Paddlers can reach Lytle Creek, roughly 9 miles off.
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