California · Rock climbing · Mammoth Lakes

The Aspen Boulder

Aspen Boulder, The in California has 15 routes across 11 grades.

15 routes
V0 – V7
Bouldering

Is Aspen Boulder, The open right now?

Alert in the area

The Forest Service lists 4 alerts for Inyo National Forest.

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

Best time to visit The Aspen Boulder

Best months: May–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

    41° / 17°

  2. Feb

    41° / 18°

  3. Mar

    45° / 22°

  4. Apr

    51° / 27°

  5. May

    60° / 35°

  6. Jun

    70° / 42°

  7. Jul

    78° / 49°

  8. Aug

    77° / 47°

  9. Sep

    71° / 40°

  10. Oct

    61° / 30°

  11. Nov

    49° / 23°

  12. Dec

    41° / 17°

Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Mammoth Lakes Rs, CA, 1.1 mi away at 7,804 ft. This station doesn't record snowfall. Source: NOAA NCEI U.S. Climate Normals 1991–2020.

The Aspen Boulder is a bouldering area in the Mammoth Ranger District of Inyo National Forest in California, managed by the Forest Service. It sits within the Mammoth Lakes Area, about 0.2 miles from the Mammoth Lakes Area climbing area and 0.4 miles from the Mammoth Creek Road climbing area, making it an easy addition to a day spent exploring the surrounding crags. The area holds 15 bouldering routes, all rated on the V scale from V0- to V7. The easiest are Slab Left at V0- and Problem B at V1, while the hardest is Scuttle Thug at V7, first climbed by Mac Lupton. The median grade is V3, so climbers can find problems across a wide range of difficulty. Summer is the most comfortable time to visit. Typical averages from a nearby weather station at Mammoth Lakes show July highs around 78°F with lows near 49°F, while winter highs stay around 41°F with lows in the teens. Nearby, the Mammoth Rock Trail and Sherwin Lakes hikes are both within a mile, and Sherwin Creek campground is about 0.9 miles away. Hot Creek, roughly 6.4 miles off, offers more paddling.

Routes (15)

Keep exploring — more climbs worth the drive

Sector FPhoto: Ken Lund, CC BY-SA 2.0 (via Flickr)

Sector F

~3 min drive

Sector F is a California bouldering crag with 8 routes.

Sector APhoto: Ken Lund, CC BY-SA 2.0 (via Flickr)

Sector A

~3 min drive

Sector A is a California bouldering crag with 18 routes across 6 grades.

Sector CPhoto: Ken Lund, CC BY-SA 2.0 (via Flickr)

Sector C

~4 min drive

Sector C is a 5-route bouldering area in California with routes spanning 5 difficulty grades.

Sister BoulderPhoto: inkknife_2000 (14 million views), CC BY-SA 2.0 (via Flickr)

Sister Boulder

~7 min drive

8 bouldering routes at Sister Boulder in California, grades 5.10a to 5.12c.

T J SlabsPhoto: inkknife_2000 (14 million views), CC BY-SA 2.0 (via Flickr)

T J Slabs

~7 min drive

T J Slabs in California has 6 bouldering routes with 5 difficulty grades.

T J LakePhoto: mjhbower, CC BY-SA 2.0 (via Flickr)

T J Lake

~7 min drive

T J Lake is a California climbing area with 4 routes across 4 grades.

Spring WallPhoto: inkknife_2000 (14 million views), CC BY-SA 2.0 (via Flickr)

Spring Wall

~7 min drive

13 routes at Spring Wall in California range across 10 difficulty grades.

Horseshoe Slabs BoulderPhoto: inkknife_2000 (7.5 million views +), CC BY-SA 2.0 (via Wikimedia Commons)

Horseshoe Slabs Boulder

~7 min drive

Horseshoe Slabs Boulder has 8 bouldering routes in California.

Horseshoe SlabsPhoto: inkknife_2000 (14 million views), CC BY-SA 2.0 (via Flickr)

Horseshoe Slabs

~7 min drive

16-route climbing area in California with mixed, sport, and trad styles.

Mammoth Lakes Area

~0 min drive

Mammoth Lakes Area in California has 21 climbing routes across 14 difficulty grades.