Massachusetts · Rock climbing · Monson

Castor

5.5
grade
Trad Gear
style
Apr, Jun–Oct
best months

The easiest route catalogued at Main Face, with five harder climbs ranging up to 5.11. First ascent by Sam Slater, Spring 1979.

  • Nearby · Mashamoquet Brook State Park · Big Bad Wolf Boulder · Lower Tier
  • Best time to go · Apr, Jun–Oct

    Best time to visit Castor

    Best months: April and June–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

      34° / 16°

      13 wet

    2. Feb

      37° / 17°

      11 wet

    3. Mar

      44° / 25°

      12 wet

    4. Apr

      57° / 36°

      12 wet

    5. May

      67° / 46°

      13 wet

    6. Jun

      75° / 56°

      11 wet

    7. Jul

      80° / 61°

      11 wet

    8. Aug

      79° / 60°

      12 wet

    9. Sep

      72° / 52°

      10 wet

    10. Oct

      61° / 40°

      11 wet

    11. Nov

      50° / 31°

      11 wet

    12. Dec

      39° / 23°

      12 wet

    Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at E Brimfield Lake, MA, 10.2 mi away at 700 ft. This station doesn't record snowfall. Source: NOAA NCEI U.S. Climate Normals 1991–2020.

Keep exploring — more climbs worth the drive

Mashamoquet Brook State ParkPhoto: Ehkastning, CC BY-SA 3.0 (via Wikimedia Commons)

Mashamoquet Brook State Park

~45 min drive

Mashamoquet Brook State Park in Connecticut has 3 bouldering routes.

Big Bad Wolf BoulderPhoto: Ehkastning, CC BY-SA 3.0 (via Wikimedia Commons)

Big Bad Wolf Boulder

~45 min drive

Big Bad Wolf Boulder is a bouldering area in Connecticut with 5 routes.

Lower TierPhoto: Marty Aligata, CC BY-SA 4.0 (via Wikimedia Commons)

Lower Tier

~45 min drive

Lower Tier in Connecticut has 13 traditional climbing routes across 9 grades.

Upper TierPhoto: Marty Aligata, CC BY-SA 4.0 (via Wikimedia Commons)

Upper Tier

~45 min drive

Upper Tier in Connecticut has 9 climbing routes across 6 grades, offering top-rope and trad options.

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holding area

Next door

Holding area is a Massachusetts bouldering crag with 1 route.

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Bunyan Mountain

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Bunyan Mountain is a Massachusetts climbing crag with 2 trad routes.

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Battleship Rock

~6 min drive

Battleship Rock in Massachusetts has 7 bouldering routes spanning 5 difficulty grades.

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Turdle Boulder

~19 min drive

Turtle Boulder in Massachusetts has 10 bouldering routes across 6 grades.

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Wizard's Cave

~19 min drive

Wizard's Cave in Massachusetts has 12 bouldering routes across 9 grades.

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Rock House Reservation

~19 min drive

Rock House Reservation in Massachusetts has 8 bouldering routes.