Frost Dates for Janesville, CA

Based on data from Susanville 2sw weather station, 11 miles away

Elevation: 4239 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. May 16
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 8

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 May 24
First Fall Frost October 3

Hard Freeze (28°F)

Last Spring Hard Freeze April 26
First Fall Hard Freeze October 21
40.30°N, 120.52°W © OpenStreetMap

Growing Season

145 Days May 16 to October 8

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 7a

Avg. annual minimum: 0 to 5°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
January43°33°22°
February48°37°26°
March54°42°30°
April61°47°34°
May69°55°40°
June79°63°47°
July88°71°53°
August87°69°52°
September80°63°45°
October67°51°36°
November52°40°28°
December43°33°22°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January6.7
February6.4
March6.3
April4.2
May3.2
June0.0
July0.0
August0.0
September0.0
October0.0
November5.3
December7.4

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 14h 53m · Shortest: 9h 07m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January7:29 AM4:55 PM9h 25m
February7:04 AM5:31 PM10h 27m
March7:22 AM7:03 PM11h 41m
April6:30 AM7:35 PM13h 05m
May5:52 AM8:06 PM14h 15m
June5:37 AM8:29 PM14h 52m
July5:50 AM8:27 PM14h 37m
August6:19 AM7:55 PM13h 36m
September6:50 AM7:05 PM12h 15m
October7:21 AM6:15 PM10h 54m
November6:57 AM4:39 PM9h 42m
December7:25 AM4:32 PM9h 08m

Nearby Stations

Canyon Dam, CAMay 18 - October 8 Chester, CAMay 28 - September 28 Quincy, CAMay 22 - September 25 Doyle 4 Sse, CAMay 21 - October 1 Portola, CAJune 11 - September 10 Manzanita Lake, CA June 9 - September 21

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