Frost Dates for Hoonah, AK

Elevation: 40 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. May 9
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. October 4

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 19
First Fall Frost September 26

Hard Freeze (28°F)

Last Spring Hard Freeze April 26
First Fall Hard Freeze October 19
58.11°N, 135.43°W © OpenStreetMap

Growing Season

148 Days May 9 to October 4

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 7b

Avg. annual minimum: 5 to 10°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
January34°31°27°
February37°32°27°
March40°34°28°
April49°41°33°
May58°49°40°
June62°55°47°
July65°58°51°
August64°58°51°
September58°51°45°
October48°43°38°
November39°35°31°
December36°32°28°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January6.0
February5.0
March5.0
April3.5
May3.4
June3.3
July4.0
August4.6
September5.7
October6.7
November6.4
December6.5

Sunrise / Sunset

Daylight Longest: 17h 54m · Shortest: 6h 07m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January8:35 AM3:25 PM6h 50m
February7:29 AM4:31 PM9h 02m
March6:18 AM5:42 PM11h 24m
April4:58 AM7:02 PM14h 04m
May3:47 AM8:13 PM16h 25m
June3:05 AM8:55 PM17h 51m
July3:23 AM8:37 PM17h 15m
August4:27 AM7:33 PM15h 06m
September5:46 AM6:14 PM12h 29m
October7:03 AM4:57 PM9h 54m
November8:16 AM3:44 PM7h 29m
December8:56 AM3:04 PM6h 09m

Nearby Stations

Gustavus, AKMay 30 - September 16 Gustavus 2 Ne, AK May 28 - September 25 Glacier Bay, AKMay 6 - October 10 Pelican, AKMay 4 - October 19 Juneau Lena Pt, AK April 11 - November 1 Juneau Mile 17, AK April 29 - October 20

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