California · Rock climbing · Big Bear City

Activator Rock

Activator Rock is a 5-route bouldering crag in California with grades 5.10 to 5.12a.

5 routes
V0
Bouldering

Is Activator Rock open right now?

Closure in the area

There's a closure order in Mountaintop Ranger District. It doesn't name Activator Rock, so check the source for the area it covers.

As of · Source: USFS · Mountaintop Ranger District. Agencies don't list every closure — check before you go.

Best time to visit Activator Rock

Best months: May–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

    46° / 24°

    6 wet

  2. Feb

    46° / 24°

    6 wet

  3. Mar

    51° / 27°

    6 wet

  4. Apr

    57° / 31°

    4 wet

  5. May

    66° / 37°

    2 wet

  6. Jun

    75° / 43°

    1 wet

  7. Jul

    80° / 50°

    2 wet

  8. Aug

    79° / 49°

    3 wet

  9. Sep

    73° / 44°

    2 wet

  10. Oct

    63° / 35°

    2 wet

  11. Nov

    53° / 28°

    3 wet

  12. Dec

    46° / 24°

    6 wet

Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Big Bear Lake, CA, 5 mi away at 6,753 ft. The station sits about 800 ft lower than this place, so expect it a little cooler here. This station doesn't record snowfall. Source: NOAA NCEI U.S. Climate Normals 1991–2020.

Activator Rock is a climbing area in the Mountaintop Ranger District of San Bernardino National Forest, managed by the Forest Service, about 10 miles from Big Bear Lake. It sits among a cluster of other climbing spots, with Belly Up Boulder and Ninkasi Boulder, The both about 0.1 mile away. Summer is the warmest stretch here. Typical averages from the Big Bear Lake weather station, about 5 miles away, run from highs near 75°F in June to about 80°F in July, with fewer wet days than the cooler months. Winter highs typically sit in the mid-40s, with lows around 24°F. Tanglewood Group Camp is less than a mile away, and the Van Dusen Canyon Spur hike is about 1.6 miles off. Holcomb Valley Ranch offers camping roughly 2.4 miles away, and Big Bear Lake Recreation Area is about 3.4 miles away.

Routes (5)