Frost Dates for Henshaw Dam, CA

Elevation: 823 m

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. April 18
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. October 26

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 April 28
First Fall Frost October 18

Hard Freeze (28°F)

Last Spring Hard Freeze March 14
First Fall Hard Freeze November 14
33.24°N, 116.76°W © OpenStreetMap

Growing Season

191 Days April 18 to October 26

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 8b

Avg. annual minimum: 15 to 20°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Csa Hot-Summer Mediterranean

Hot, dry summers and mild, wet winters. Classic Mediterranean climate ideal for grapes, olives, tomatoes, and herbs. Summer irrigation is usually necessary.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January61°46°31°
February61°47°32°
March65°50°35°
April69°53°38°
May75°59°43°
June85°66°46°
July92°73°53°
August94°74°54°
September89°69°49°
October79°59°40°
November69°51°34°
December60°45°30°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January8.2
February8.5
March8.2
April3.9
May1.2
June0.0
July0.0
August0.0
September0.0
October1.7
November5.8
December8.3

Sunrise / Sunset

Daylight Longest: 14h 12m · Shortest: 9h 48m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January6:59 AM5:01 PM10h 02m
February6:36 AM5:24 PM10h 49m
March6:07 AM5:53 PM11h 45m
April5:35 AM6:25 PM12h 50m
May5:08 AM6:52 PM13h 43m
June4:54 AM7:06 PM14h 11m
July5:00 AM6:60 PM13h 60m
August5:23 AM6:37 PM13h 14m
September5:54 AM6:06 PM12h 12m
October6:25 AM5:35 PM11h 09m
November6:53 AM5:07 PM10h 15m
December7:06 AM4:54 PM9h 49m

Nearby Stations

Palomar Mtn Obsy, CA April 29 - November 18 Julian Cdf, CA March 27 - December 1 Valley Ctr 1n, CA February 19 - December 1 Ramona AP, CA March 19 - November 23 San Pasqual Animal Pk, CA February 2 - December 7 Ramona Fire Dept, CA March 4 - December 4

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