California · Rock climbing · Altadena

Arroyo Seco Boulders

7 bouldering routes in California spanning 5 difficulty grades.

7 routes
V0 – V3
Bouldering

Is Arroyo Seco Boulders open right now?

Alert in the area

The Forest Service lists 7 alerts for Angeles National Forest.

As of · Source: USFS · Angeles National Forest. Agencies don't list every closure — check before you go.

Best time to visit Arroyo Seco Boulders

Best months: October–June. 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

    68° / 45°

    7 wet

  2. Feb

    69° / 46°

    7 wet

  3. Mar

    73° / 48°

    6 wet

  4. Apr

    76° / 51°

    4 wet

  5. May

    78° / 54°

    3 wet

  6. Jun

    84° / 58°

    2 wet

  7. Jul

    89° / 62°

    1 wet

  8. Aug

    91° / 63°

    0 wet

  9. Sep

    90° / 62°

    1 wet

  10. Oct

    83° / 56°

    2 wet

  11. Nov

    75° / 50°

    3 wet

  12. Dec

    67° / 45°

    6 wet

Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Pasadena, CA, 4.5 mi away at 864 ft. The station sits about 700 ft lower than this place, so expect it a little cooler here. Source: NOAA NCEI U.S. Climate Normals 1991–2020.

Arroyo Seco Boulders is a bouldering area in the Los Angeles Gateway Ranger District of Angeles National Forest in California. It sits among a cluster of trails and other climbing spots, with the Millard Canyon Crest Trail passing just 0.1 mile away and the El Prieto Trail about 0.2 mile off. The boulders here are all boulder problems, and the route list runs seven in total, with grades from V0 to V3. The easiest is Unnamed Arete at V0, and the hardest is Eternal August, also known as "SpreadEagleNebula," at V3. The median grade is V2. Spring and fall are the most comfortable times to visit. Typical averages from a nearby weather station in Pasadena show April highs around 76°F and October highs around 83°F, while July and August average in the low 90s. Other climbing is close by, with Roadside Boulder and Canyon Crest Road Boulder each about 0.2 mile away. For an overnight stay, Millard campground is about 1.2 miles off.

Routes (7)

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