Oregon · Rock climbing · Foster

Unknown Boulder

5 routes
V0 – V4
Bouldering
Jun–Sep
best months

Unknown Boulder is a bouldering area in Oregon, about 5 miles from the town of Foster. It sits among several other bouldering spots, with Fight Club Boulder, Azain Boulder and Boys in the Woods Boulder all within about a tenth of a mile. The climbing here is all bouldering, with five routes spread across the V0 to V4 range. The easiest is Gumb at V0, and the hardest is The Tonsil at V4. 3 Star Ledge and Slabarific are both V3. Summer is the most comfortable time to visit. Typical averages from the nearby Foster Dam weather station show July and August highs in the low 80s with only three or four wet days a month, while winter brings highs in the mid-40s and rain on most days. Cascadia Day Use is about 5 miles away for a hike, and Whitcomb Creek offers canoeing at a similar distance.

  • Best time to go · Jun–Sep

    Best time to visit Unknown Boulder

    Best months: June–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

      48° / 34°

      19 wet

    2. Feb

      51° / 35°

      17 wet

    3. Mar

      55° / 37°

      19 wet

    4. Apr

      60° / 40°

      17 wet

    5. May

      67° / 44°

      13 wet

    6. Jun

      73° / 48°

      9 wet

    7. Jul

      82° / 51°

      4 wet

    8. Aug

      83° / 50°

      3 wet

    9. Sep

      76° / 47°

      7 wet

    10. Oct

      64° / 42°

      13 wet

    11. Nov

      53° / 38°

      18 wet

    12. Dec

      46° / 34°

      20 wet

    Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Foster Dam, OR, 5.2 mi away at 550 ft. Source: NOAA NCEI U.S. Climate Normals 1991–2020.

Routes (5)

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