Frost Dates for Girdwood, AK

Based on data from Alyeska weather station, 2 miles away

Elevation: 36 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 8
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 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 May 14
First Fall Frost September 23

Hard Freeze (28°F)

Last Spring Hard Freeze April 26
First Fall Hard Freeze October 11
60.94°N, 149.17°W © OpenStreetMap

Growing Season

144 Days May 8 to September 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 6a

Avg. annual minimum: −10 to −5°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Dfc Subarctic

Short, cool summers and long, very cold winters. Growing seasons of 3–4 months require fast-maturing varieties. Root vegetables, potatoes, and cold-hardy greens are the most reliable.

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
January27°22°17°
February31°25°19°
March36°28°20°
April46°37°29°
May55°46°37°
June64°54°45°
July67°58°50°
August65°56°48°
September56°49°41°
October44°38°32°
November33°27°22°
December29°24°19°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January5.5
February4.8
March5.3
April4.6
May3.5
June2.6
July3.1
August5.1
September6.3
October5.8
November5.7
December6.0

Sunrise / Sunset

Daylight Alaska Time (AKT) Longest: 18h 51m · Shortest: 5h 09m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Alaska Time (AKT))
Month Sunrise Sunset Daylight
January10:04 AM4:08 PM6h 04m
February8:52 AM5:30 PM8h 39m
March8:26 AM7:46 PM11h 19m
April6:47 AM9:06 PM14h 19m
May5:22 AM10:24 PM17h 02m
June4:33 AM11:20 PM18h 47m
July5:01 AM11:03 PM18h 02m
August6:16 AM9:45 PM15h 30m
September7:35 AM8:07 PM12h 32m
October8:53 AM6:31 PM9h 38m
November9:16 AM4:07 PM6h 50m
December10:16 AM3:28 PM5h 12m

Nearby Stations

Portage Glacier V C, AK May 27 - September 12 Hope, AKMay 18 - September 24 Whittier, AKApril 25 - October 14 Eagle Rvr Nature Ctr, AK May 16 - September 20 Glen Alps, AK May 18 - September 23 Anchorage Upper De Armoun, AK May 7 - September 28

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