Frost Dates for Byron, CA

Based on data from Tracy Pumping Plt weather station, 6 miles away

Elevation: 33 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 19
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 10

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 31
First Fall Frost December 4

Hard Freeze (28°F)

Last Spring Hard Freeze January 1
First Fall Hard Freeze December 22
37.87°N, 121.64°W © OpenStreetMap

Growing Season

326 Days January 19 to December 10

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 9b

Avg. annual minimum: 25 to 30°F

Learn more

Köppen Climate

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

Cool to cold with low rainfall and wide temperature swings. Common in the western Great Plains and central Asia. Short growing seasons benefit from season extension techniques.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January56°48°41°
February62°53°44°
March67°57°47°
April73°62°50°
May80°68°55°
June88°74°59°
July93°78°62°
August93°77°62°
September89°75°60°
October79°67°55°
November66°56°46°
December57°49°40°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January2.6
February3.6
March3.8
April3.1
May0.5
June0.0
July0.0
August0.0
September0.0
October0.8
November2.8
December2.7

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 14h 37m · Shortest: 9h 23m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January7:26 AM5:05 PM9h 39m
February7:03 AM5:39 PM10h 36m
March7:25 AM7:07 PM11h 42m
April6:37 AM7:36 PM12h 59m
May6:01 AM8:04 PM14h 02m
June5:48 AM8:25 PM14h 36m
July6:01 AM8:23 PM14h 22m
August6:27 AM7:54 PM13h 28m
September6:54 AM7:08 PM12h 14m
October7:22 AM6:21 PM10h 60m
November6:54 AM4:49 PM9h 55m
December7:20 AM4:44 PM9h 24m

Nearby Stations

Livermore Muni AP, CA February 27 - December 1 Livermore, CA February 15 - December 2 Tracy Carbona, CA February 25 - November 26 Antioch Pumping Plt #3, CA January 12 - December 19 Mt Diablo Junction, CA March 8 - December 22 Stockton Fire Stn 4, CA February 5 - December 8

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