Frost Dates for Girdwood, AK

Based on data from Alyeska weather station, 2 miles away

Frost Dates

Last Spring Frost (50%) iA 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%) iA 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. September 29
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30% Probability iOnly 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 iHardiness 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 (−23 to −21°C)

Learn more

Köppen Climate iThe 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

10° 30° 50° 70°
22°
High: 27°F
Avg: 22°F
Low: 17°F
Jan
25°
High: 31°F
Avg: 25°F
Low: 19°F
Feb
28°
High: 36°F
Avg: 28°F
Low: 20°F
Mar
37°
High: 46°F
Avg: 37°F
Low: 29°F
Apr
46°
High: 55°F
Avg: 46°F
Low: 37°F
May
54°
High: 64°F
Avg: 54°F
Low: 45°F
Jun
58°
High: 67°F
Avg: 58°F
Low: 50°F
Jul
56°
High: 65°F
Avg: 56°F
Low: 48°F
Aug
49°
High: 56°F
Avg: 49°F
Low: 41°F
Sep
38°
High: 44°F
Avg: 38°F
Low: 32°F
Oct
27°
High: 33°F
Avg: 27°F
Low: 22°F
Nov
24°
High: 29°F
Avg: 24°F
Low: 19°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 2" 4" 6" 6.3"
5.5"
5.53"
Jan
4.8"
4.75"
Feb
5.3"
5.27"
Mar
4.6"
4.56"
Apr
3.5"
3.47"
May
2.6"
2.61"
Jun
3.1"
3.14"
Jul
5.1"
5.11"
Aug
6.3"
6.33"
Sep
5.8"
5.80"
Oct
5.7"
5.70"
Nov
6.0"
6.04"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec6h8.5h11.5h14.5h17h19h18h15.5h12.5h9.5h7h5h
Jan: 8:58 AM – 3:02 PM · 6h 04m
Feb: 7:41 AM – 4:19 PM · 8h 39m
Mar: 6:20 AM – 5:40 PM · 11h 19m
Apr: 4:50 AM – 7:10 PM · 14h 19m
May: 3:29 AM – 8:31 PM · 17h 02m
Jun: 2:36 AM – 9:24 PM · 18h 47m
Jul: 2:59 AM – 9:01 PM · 18h 02m
Aug: 4:15 AM – 7:45 PM · 15h 30m
Sep: 5:44 AM – 6:16 PM · 12h 32m
Oct: 7:11 AM – 4:49 PM · 9h 38m
Nov: 8:35 AM – 3:25 PM · 6h 50m
Dec: 9:24 AM – 2:36 PM · 5h 12m
Daylight Longest: 18h 51m · Shortest: 5h 09m

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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