Jack's Crack
One of three routes at Sentinel Rock, representing the crag's entry-level climbing.
- Easy 5th
- grade
- Trad Gear
- style
Best time to visit Jack's Crack
Best months: February–November. 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
54° / 42°
11 wet
Feb
55° / 42°
11 wet
Mar
58° / 43°
10 wet
Apr
62° / 44°
7 wet
May
68° / 49°
4 wet
Jun
76° / 55°
1 wet
Jul
82° / 62°
1 wet
Aug
83° / 61°
0 wet
Sep
80° / 60°
1 wet
Oct
72° / 54°
4 wet
Nov
60° / 46°
7 wet
Dec
53° / 41°
11 wet
Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Mt Diablo Junction, CA, 1.9 mi away at 2,170 ft. The station sits about 500 ft higher than this place, so expect it a little warmer here. Source: NOAA NCEI U.S. Climate Normals 1991–2020.
One of three climbs catalogued at Sentinel Rock in Mount Diablo State Park, this route sits at the easier end of the grade spectrum found across the crag.
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