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Summit

Roundtop

California

About

Roundtop is a summit of 6,317 feet in the San Gabriel Mountains National Monument Ranger District of Angeles National Forest, about 12 miles from Altadena, California. Spring and fall are the most comfortable times to go. Typical averages from a nearby weather station at Mt Wilson show May highs around 70°F and October highs around 72°F, while July and August average in the mid-80s. The Monte Cristo Trail starts just 0.1 mile away, and the Alder Creek Trail is about 1.6 miles off. Climbers can head to the Angeles National Forest climbing area, about 2.1 miles away, and the Monte Cristo campground sits about 2.5 miles from the summit.

Summit Facts

Summit elevation

6,317 ft

Elevation from USGS 3D Elevation Program terrain data (about 10 m resolution).

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Location

Roundtop

California

Name and location: U.S. Geological Survey, Geographic Names Information System (GNIS). Elevation: USGS 3D Elevation Program. View the GNIS record.

Facts about this place

When to go

Best time to go: Apr–Nov. The mildest months here, with typical highs of 63–85°F and lows of 42–64°F.

Typical monthly averages (not a forecast) from the Mt Wilson Cbs, CA weather station, 8.4 mi away. High / low in °F.

  1. Jan56° high38° low
  2. Feb55° high37° low
  3. Mar59° high39° low
  4. Apr63° high42° low
  5. May70° high48° low
  6. Jun79° high58° low
  7. Jul84° high64° low
  8. Aug85° high64° low
  9. Sep81° high59° low
  10. Oct72° high51° low
  11. Nov63° high43° low
  12. Dec55° high37° low

Source: NOAA NCEI U.S. Climate Normals 1991–2020

Where it is

Nearest town
Altadena, California · 12 mi

Source: USFS EDW boundaries; USGS GNIS populated places

Conditions

Active alerts for Angeles National Forest as of Oct 9, 2026:

Source: USFS forest alerts

Nearby

Source: Roamze catalog (indexable pages within 10 miles, PostGIS distance)