Facility · California ·
Managed by the USDA Forest Service
Angeles National Forest (NF) · Open Access
For additional information on programs and activities available at the visitor center, follow the link.
For additional information contact the Santa Clara/Mojave Rivers Ranger District Office at (661) 296-9710 or contact the center directly at (626) 821-6737 or their website at http://www.grassyhollow.net.
34.37536, -117.72216 · 34°22'31.3"N 117°43'19.8"W
Typically 83°F in Jul, down to 48°F in Dec.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 48 | 48 | 54 | 60 | 69 | 78 | 83 | 82 | 75 | 64 | 55 | 48 |
| Low °F | 26 | 25 | 29 | 32 | 39 | 44 | 53 | 51 | 46 | 37 | 29 | 25 |
| Precip in | 4.4 | 4.9 | 1.9 | 0.8 | 0.8 | 0.1 | 1.1 | 0.3 | 0.4 | 1.2 | 1.1 | 4.1 |
1991–2020 averages from the nearest NOAA station, 4.9 mi away — not measured at the facility itself, and elevation can make a real difference over that distance.
Recreation.gov last updated this record on 2026-02-25.
Facility information and photographs from Recreation.gov (RIDB). SpotOpened is not affiliated with Recreation.gov or any federal agency.
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