Frost Dates for Highgrove, CA

Based on data from Riverside Citrus Exp weather station, 4 miles away

Elevation: 951 ft

Frost Dates

Last Spring Frost (50%) A 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. January 10
First Fall Frost (50%) A 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. January 2

This location has a nearly year-round growing season with a brief frost risk period in winter.

30% Probability

Only a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.
Last Spring Frost January 25
First Fall Frost December 26
34.02°N, 117.33°W © OpenStreetMap

Growing Season

358 Days January 10 to January 2

USDA Hardiness Zone

Hardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.
Zone 10a

Avg. annual minimum: 30 to 35°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
BSh Hot Semi-Arid (Steppe)

Hot with low but not negligible rainfall. Less extreme than true desert. Dryland farming techniques and drought-tolerant varieties work well. Mulching and water conservation are key.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January70°57°44°
February70°57°45°
March72°60°47°
April75°63°50°
May80°68°55°
June87°73°58°
July94°79°63°
August97°80°64°
September93°77°61°
October82°68°55°
November76°62°47°
December69°56°43°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January5.3
February5.7
March5.0
April2.3
May0.0
June0.0
July0.0
August0.0
September0.0
October0.0
November0.7
December3.4

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 14h 16m · Shortest: 9h 44m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January6:60 AM4:58 PM9h 58m
February6:41 AM5:27 PM10h 47m
March7:07 AM6:51 PM11h 45m
April6:24 AM7:15 PM12h 51m
May5:53 AM7:39 PM13h 46m
June5:42 AM7:57 PM14h 15m
July5:53 AM7:57 PM14h 03m
August6:16 AM7:32 PM13h 16m
September6:38 AM6:50 PM12h 12m
October7:01 AM6:08 PM11h 08m
November6:29 AM4:40 PM10h 12m
December6:53 AM4:38 PM9h 45m

Nearby Stations

Riverside Fire Stn 3, CA January 9 - December 25 Riverside Muni AP, CA January 9 - December 30 Redlands, CA January 27 - December 19 Ontario Intl AP, CA January 4 - December 30 Chino AP, CA January 17 - December 19 Elsinore, CA January 28 - December 18

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