Colorado · Rock climbing · Wolcott

Big Ass Boulder

Big Ass Boulder in Colorado has 13 bouldering routes across 10 grades.

13 routes
V1 – V10
Bouldering

Best time to visit Big Ass Boulder

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.

  1. Jan

    28° / 4°

  2. Feb

    33° / 7°

  3. Mar

    42° / 15°

  4. Apr

    51° / 24°

  5. May

    61° / 32°

  6. Jun

    74° / 39°

  7. Jul

    79° / 44°

  8. Aug

    76° / 43°

  9. Sep

    69° / 36°

  10. Oct

    55° / 26°

  11. Nov

    40° / 16°

  12. Dec

    29° / 6°

Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Green Mt Dam, CO, 22.5 mi away at 7,740 ft. The station sits about 800 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.

Big Ass Boulder is a climbing area on Bureau of Land Management land in the Colorado River Valley Field Office in Colorado. It sits within a cluster of climbing spots and campgrounds, with Waterside Boulder and Cave Boulder both about 0.1 mile away and Wolcott Campground also within a tenth of a mile. Summer is the most comfortable time to visit. Typical averages from the nearby Green Mt Dam weather station, which sits about 840 feet lower than the boulder, show July highs around 79°F with lows near 44°F, while winter highs there stay in the 20s. The Eagle Valley Trail, a mountain biking route, is about 3.5 miles away. The Boneyard Extension Trail (Hillbilly) hike is about 5.5 miles off, and Lake Creek, a canoeing spot, is roughly 6.9 miles away.

Routes (13)

Keep exploring — more climbs worth the drive

Roof RockPhoto: KimonBerlin, CC BY-SA 2.0 (via Flickr)

Roof Rock

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Hornsilver

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Booth Creek Boulders

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Upper Tier RightPhoto: KimonBerlin, CC BY-SA 2.0 (via Flickr)

Upper Tier Right

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Green Mountain ReservoirPhoto: Nathan Anderson nathananderson, CC0 (via Wikimedia Commons)

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