Frost Dates for Ajo, AZ

Elevation: 534 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. January 10
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 21

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 27
First Fall Frost December 10

Hard Freeze (28°F)

Last Spring Hard Freeze January 8
First Fall Hard Freeze January 3
32.37°N, 112.86°W © OpenStreetMap

Growing Season

346 Days January 10 to December 21

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.
BWh Hot Desert

Very hot and extremely dry with minimal rainfall. Irrigation is essential for any gardening. Heat-tolerant crops and desert-adapted plants thrive; shade structures help in peak summer.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January68°56°45°
February71°59°48°
March77°65°52°
April84°71°57°
May92°79°66°
June101°88°74°
July104°92°80°
August103°91°79°
September99°87°74°
October89°77°64°
November77°64°51°
December67°55°43°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January0.0
February0.0
March0.0
April0.0
May0.0
June0.0
July1.8
August5.2
September0.6
October0.0
November0.0
December0.0

Sunrise / Sunset

Daylight Longest: 14h 08m · Shortest: 9h 52m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January6:57 AM5:03 PM10h 06m
February6:34 AM5:26 PM10h 51m
March6:07 AM5:53 PM11h 46m
April5:36 AM6:24 PM12h 48m
May5:10 AM6:50 PM13h 40m
June4:57 AM7:03 PM14h 07m
July5:02 AM6:58 PM13h 56m
August5:24 AM6:36 PM13h 12m
September5:54 AM6:06 PM12h 11m
October6:25 AM5:35 PM11h 11m
November6:51 AM5:09 PM10h 18m
December7:03 AM4:57 PM9h 53m

Nearby Stations

Organ Pipe Cactus Nm, AZ February 4 - December 15 Gila Bend 2se, AZ January 23 - December 11 Painted Rock Dam, AZ January 21 - December 15 Dateland Whitewing Rch, AZ January 25 - December 13 Tacna 3 Ne, AZ February 13 - December 1 Maricopa 4 N, AZ February 23 - November 24

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