Frost Dates for Tombstone, AZ

Elevation: 1420 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. March 4
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. November 29

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 March 16
First Fall Frost November 22

Hard Freeze (28°F)

Last Spring Hard Freeze February 8
First Fall Hard Freeze December 12
31.71°N, 110.07°W © OpenStreetMap

Growing Season

270 Days March 4 to November 29

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 9a

Avg. annual minimum: 20 to 25°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 Light Frost (32°F)
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January62°50°38°
February64°52°40°
March71°58°44°
April79°64°49°
May87°72°57°
June96°81°66°
July94°81°68°
August92°79°67°
September89°76°64°
October81°68°54°
November70°58°45°
December61°49°38°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January3.3
February3.6
March1.1
April0.0
May0.0
June1.5
July4.9
August4.5
September4.0
October1.3
November1.0
December4.2

Sunrise / Sunset

Daylight Longest: 14h 04m · Shortest: 9h 56m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January6:56 AM5:04 PM10h 09m
February6:34 AM5:26 PM10h 53m
March6:07 AM5:53 PM11h 46m
April5:36 AM6:24 PM12h 47m
May5:11 AM6:49 PM13h 37m
June4:58 AM7:02 PM14h 04m
July5:04 AM6:56 PM13h 53m
August5:25 AM6:35 PM13h 10m
September5:55 AM6:05 PM12h 11m
October6:24 AM5:36 PM11h 12m
November6:50 AM5:10 PM10h 21m
December7:02 AM4:58 PM9h 56m

Nearby Stations

Benson 6se, AZ April 12 - November 1 Sierra Vista, AZ April 5 - November 9 Kartchner Caverns, AZ March 20 - November 15 Bisbee 1wnw, AZ April 1 - November 10 Pearce - Sunsites, AZ April 14 - November 2 Ft Huachuca Pioneer Airfield, AZ March 16 - November 21

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