Riverside County, California · Frost dates
Riverside County frost dates.
First-frost, last-frost, and growing-season length for Riverside County, California. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 9b
32°F — light freeze
Last spring frost
- 10%
- 03-01
- 20%
- 02-23
- 50%
- 02-07
- 80%
- 01-19
- 90%
- 01-07
First fall frost
- 10%
- 11-16
- 20%
- 11-22
- 50%
- 12-02
- 80%
- 12-14
- 90%
- 12-21
28°F — killing freeze
Last spring freeze
- 10%
- 02-16
- 20%
- 02-06
- 50%
- 01-15
- 80%
- 12-27
- 90%
- 12-18
First fall freeze
- 10%
- 11-24
- 20%
- 12-01
- 50%
- 12-13
- 80%
- 12-28
- 90%
- 01-05
Growing season length (days, 28°F threshold)
- Short year
- 281
- Median
- 332
- Long year
- 383
Source NOAA station
DESERT RESORTS RGNL AP, CA US
11.5 mi · 30 yrs of record (1991–2020) · -118 ft elev.
Data from DESERT RESORTS RGNL AP, CA US, 11.5 miles away with 30-year NOAA record (1991-2020).
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