Frost Dates for Fort Defiance, AZ

Based on data from Window Rock AP weather station, 6 miles away

Elevation: 6834 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 29
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. September 28

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 June 2
First Fall Frost September 23

Hard Freeze (28°F)

Last Spring Hard Freeze May 13
First Fall Hard Freeze October 4
35.74°N, 109.08°W © OpenStreetMap

Growing Season

122 Days May 29 to September 28

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 5b

Avg. annual minimum: −15 to −10°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) Hard Frost (28°F)
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January45°30°14°
February49°34°19°
March58°41°24°
April65°47°29°
May74°55°36°
June85°65°45°
July88°72°55°
August85°69°52°
September79°61°43°
October68°49°31°
November56°39°21°
December46°30°14°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January1.8
February1.7
March1.9
April1.8
May1.6
June1.5
July2.3
August2.3
September2.4
October2.0
November1.7
December1.6

Sunrise / Sunset

Daylight Mountain Time (MT) Longest: 14h 25m · Shortest: 9h 35m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month Sunrise Sunset Daylight
January7:30 AM5:21 PM9h 50m
February7:10 AM5:52 PM10h 42m
March7:34 AM7:18 PM11h 44m
April6:49 AM7:44 PM12h 55m
May6:16 AM8:09 PM13h 53m
June6:04 AM8:28 PM14h 24m
July6:16 AM8:28 PM14h 11m
August6:40 AM8:01 PM13h 21m
September7:04 AM7:17 PM12h 13m
October7:29 AM6:34 PM11h 04m
November6:59 AM5:04 PM10h 05m
December7:24 AM4:60 PM9h 36m

Nearby Stations

Gallup Muni AP, NM May 31 - September 28 Gallup Sand & Gravel, NM May 11 - October 7 Ganado, AZMay 15 - October 10 Sanders, AZMay 22 - October 8 Mcgaffey 5 Se, NM June 5 - September 25 Zuni, NMMay 29 - October 2

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