Arizona · Rock climbing · Phoenix

The Siblings Boulder

8 routes
V0 – V4
Bouldering
Nov–Apr
best months

The Siblings Boulder is a bouldering area in Phoenix South Mountain Park, on city land in Phoenix, Arizona. It sits among a cluster of other climbing spots, with Big Poppa, The Arena Area Foo and Bittersweet Boulder all about 0.1 mile away. The name points to the bouldering itself, and the routes here run from V0 up to V4, so climbers of all levels can find something to work on. Winter and early spring are the most comfortable times to visit. Typical averages from a nearby weather station in South Phoenix show January highs around 67°F and lows near 42°F, while summer highs climb into the low 100s. That station sits a few hundred feet lower than the boulders, so temperatures on the rock run a little cooler. The routes are all bouldering, and the hardest is Siblings Traverse at V4. Other options include Check Yourself and One In The Oven at V0, and Family Feud at V2. The Guadalupe Perimeter Trail is about 0.2 mile away for a walk, and the Desert Classic Trail is about 0.7 mile away for mountain biking.

  • Best time to go · Nov–Apr

    Best time to visit The Siblings Boulder

    Best months: November–April. 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

      67° / 42°

      4 wet

    2. Feb

      71° / 44°

      4 wet

    3. Mar

      78° / 48°

      4 wet

    4. Apr

      85° / 54°

      2 wet

    5. May

      93° / 61°

      1 wet

    6. Jun

      101° / 69°

      1 wet

    7. Jul

      103° / 77°

      2 wet

    8. Aug

      101° / 78°

      3 wet

    9. Sep

      97° / 71°

      3 wet

    10. Oct

      87° / 59°

      2 wet

    11. Nov

      74° / 48°

      2 wet

    12. Dec

      65° / 41°

      3 wet

    Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at South Phoenix, AZ, 4.3 mi away at 1,155 ft. Source: NOAA NCEI U.S. Climate Normals 1991–2020.

Routes (8)