Idaho · Bouldering · Boise

The Crystal Butt Start

The hardest climb at The Fortress among nine routes in the V0–V4 range.

V4
grade
Bouldering Pads
style

Best time to visit The Crystal Butt Start

Best months: April–June and September–October. 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

    39° / 26°

    11 wet · 5 snow

  2. Feb

    46° / 29°

    9 wet · 3 snow

  3. Mar

    55° / 35°

    10 wet · 2 snow

  4. Apr

    62° / 40°

    9 wet

  5. May

    72° / 48°

    8 wet

  6. Jun

    81° / 54°

    5 wet

  7. Jul

    93° / 62°

    3 wet

  8. Aug

    91° / 61°

    2 wet

  9. Sep

    80° / 53°

    4 wet

  10. Oct

    65° / 42°

    6 wet

  11. Nov

    49° / 32°

    10 wet · 2 snow

  12. Dec

    39° / 25°

    12 wet · 5 snow

Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Boise Air Terminal, ID, 5.2 mi away at 2,814 ft. The station sits about 800 ft lower than this place, so expect it a little cooler here. Source: NOAA NCEI U.S. Climate Normals 1991–2020.

This is the hardest route catalogued at The Fortress, where nine climbs span from V0 to V4.

Photo of the crag

The Fortress — the crag this route is on
The Fortress, Idaho — this photo shows the crag, not this individual route.Photo: Matt Lavin, CC BY-SA 2.0 (via Flickr)

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