Frost Dates for Alpine, CA

Elevation: 517 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. February 12
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. December 24

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 February 26
First Fall Frost December 14

Hard Freeze (28°F)

Last Spring Hard Freeze January 22
First Fall Hard Freeze January 4
32.84°N, 116.78°W © OpenStreetMap

Growing Season

316 Days February 12 to December 24

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.
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
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January64°53°43°
February64°53°42°
March67°56°44°
April71°59°47°
May74°63°51°
June81°68°54°
July87°73°60°
August89°76°62°
September86°73°60°
October78°66°54°
November71°59°48°
December63°52°42°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January7.5
February6.2
March6.4
April4.8
May1.5
June0.0
July0.0
August0.0
September0.0
October0.8
November5.8
December6.3

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 14h 10m · Shortest: 9h 50m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January6:55 AM4:58 PM10h 04m
February6:37 AM5:27 PM10h 50m
March7:04 AM6:49 PM11h 45m
April6:23 AM7:12 PM12h 49m
May5:53 AM7:34 PM13h 41m
June5:43 AM7:52 PM14h 09m
July5:54 AM7:52 PM13h 58m
August6:15 AM7:28 PM13h 13m
September6:36 AM6:47 PM12h 11m
October6:57 AM6:07 PM11h 10m
November6:24 AM4:40 PM10h 16m
December6:48 AM4:38 PM9h 51m

Nearby Stations

El Capitan Dam, CA March 19 - December 8 El Cajon, CA January 6 - December 21 Ramona Fire Dept, CA March 4 - December 4 Cuyamaca, CAApril 19 - October 27 Ramona AP, CA March 19 - November 23 Julian Cdf, CA March 27 - December 1

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