Strainer
Mid-upper range problem among 15 routes at Swallow Rock Boulders.
- V5
- grade
- Bouldering Pads
- style
Best time to visit Strainer
Best months: February–June and October–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
52° / 33°
13 wet
Feb
57° / 34°
12 wet
Mar
62° / 36°
11 wet
Apr
67° / 38°
9 wet
May
75° / 43°
6 wet
Jun
84° / 48°
2 wet
Jul
92° / 53°
1 wet
Aug
91° / 51°
0 wet
Sep
88° / 45°
1 wet
Oct
76° / 39°
5 wet
Nov
58° / 35°
11 wet
Dec
50° / 32°
14 wet
Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Covelo, CA, 8.9 mi away at 1,413 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 15 routes catalogued at Swallow Rock Boulders, this climb sits in the middle-upper range of the crag's V1–V9 span.
Keep exploring — more climbs worth the drive
Dos Rios
~2 min drive
Riverside California crag with moderate climbing and scenic water views.
Navarro Beach
~1h 12m drive
Navarro Beach in California has 9 climbing routes across 7 difficulty grades.
Shelter Cove
~1h 19m drive
7 bouldering routes in California spanning 6 difficulty grades.
Marble Caves
~1h 21m drive
Marble Caves in California has 3 climbing routes with sport and trad options.
Visionary Buttress
~1h 21m drive
Visionary Buttress in California has 9 climbing routes across 6 grades.
Up And Down Wall
~1h 21m drive
5 sport routes at Up And Down Wall in California, spanning 4 difficulty grades.
The Bowling Ball
~1h 21m drive
Bowling Ball in California has 5 routes across 4 grades, offering sport and trad climbing.
Poison Garden
~1h 21m drive
Poison Garden in California has 16 climbing routes on 12 difficulty grades.
Mystery Tower
~1h 21m drive
Mystery Tower is a California climbing crag with 10 sport routes across 6 difficulty grades.
Main Tower
~1h 21m drive
Main Tower in California has 8 sport climbing routes across 7 difficulty grades.

