Frost Dates for Flagstaff 4 Sw, AZ

Elevation: 2172 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. June 23
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 15

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 30
First Fall Frost September 8

Hard Freeze (28°F)

Last Spring Hard Freeze June 10
First Fall Hard Freeze September 26
35.16°N, 111.73°W © OpenStreetMap

Growing Season

84 Days June 23 to September 15

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.
Dsb Warm-Summer Continental (Dry Summer)

Warm, dry summers and cold, snowy winters. Common in mountain regions. Moderate growing season with irrigation needs in summer.

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
January44°28°13°
February46°31°16°
March52°36°21°
April59°42°25°
May67°49°30°
June78°57°37°
July82°64°47°
August79°63°47°
September74°56°38°
October64°46°28°
November53°36°19°
December44°28°13°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January5.8
February5.5
March6.2
April4.3
May3.6
June1.3
July3.4
August3.2
September3.0
October3.6
November5.2
December6.0

Sunrise / Sunset

Daylight Longest: 14h 22m · Shortest: 9h 38m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January7:04 AM4:56 PM9h 53m
February6:38 AM5:22 PM10h 43m
March6:08 AM5:52 PM11h 44m
April5:33 AM6:27 PM12h 54m
May5:05 AM6:55 PM13h 51m
June4:49 AM7:11 PM14h 21m
July4:56 AM7:04 PM14h 09m
August5:20 AM6:40 PM13h 20m
September5:54 AM6:06 PM12h 13m
October6:27 AM5:33 PM11h 05m
November6:57 AM5:03 PM10h 07m
December7:11 AM4:49 PM9h 38m

Nearby Stations

Flagstaff Pulliam AP, AZ June 4 - September 28 Bellemont Wfo, AZ June 21 - September 17 Ft Valley, AZ June 11 - September 25 Walnut Canyon Nm, AZ May 13 - October 6 Oak Creek Canyon, AZ April 14 - November 5 Mund'S Park, AZ June 10 - September 27

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