Boulder Rock Club
Rock Climbing business nearby (~4 mi away) — hasn't claimed their Roamze page yet
Colorado · Rock climbing · Boulder
Thunder Muscle
Among the most difficult climbs at Seal Rock.
- 5.14a
- grade
- Sport Bolted
- style
Best time to visit Thunder Muscle
Best months: May–September. 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
39° / 17°
5 wet
Feb
40° / 17°
5 wet
Mar
47° / 22°
6 wet
Apr
52° / 27°
8 wet
May
61° / 35°
10 wet
Jun
73° / 44°
9 wet
Jul
79° / 50°
10 wet
Aug
77° / 48°
11 wet
Sep
70° / 41°
8 wet
Oct
57° / 31°
6 wet
Nov
47° / 24°
5 wet
Dec
40° / 17°
5 wet
Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Gross Rsvr, CO, 4 mi away at 7,970 ft. The station sits about 700 ft higher than this place, so expect it a little warmer here. This station doesn't record snowfall. Source: NOAA NCEI U.S. Climate Normals 1991–2020.
One of the hardest routes catalogued at Seal Rock, where climbs span from 5.4 to 5.14a/b across 27 documented ascents.
Photo of the crag
Keep exploring — more climbs worth the drive
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The Hand in Colorado has 13 routes with 12 difficulty grades, offering mixed and sport climbing.
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~1 min drive
Square Rock in Colorado has 6 routes with 6 difficulty grades, offering bouldering, sport, and trad climbing.
Photo: laurascudder, CC BY-SA 2.0 (via Flickr)Red Devil
~1 min drive
Red Devil in Colorado has 9 climbing routes across 8 grades, offering sport and trad options.
Local businesses nearby
Outfitters and businesses near Boulder. They haven’t set up their Roamze page yet.
View operator
Movement Gyms
Rock Climbing business nearby (~5 mi away) — hasn't claimed their Roamze page yet
Wildcat Mountaineering
Rock Climbing business nearby (~18 mi away) — hasn't claimed their Roamze page yet
