Frost Dates for Thorne Bay, AK

Elevation: 87 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 1
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 13

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 5
First Fall Frost October 7

Hard Freeze (28°F)

Last Spring Hard Freeze April 11
First Fall Hard Freeze October 30
55.69°N, 132.52°W © OpenStreetMap

Growing Season

165 Days May 1 to October 13

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.
Cfb Oceanic (Marine West Coast)

Mild year-round with cool summers and wet winters. Excellent for cool-season crops like brassicas, peas, and root vegetables. Extended harvest seasons but summer heat-loving crops may struggle.

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
January38°33°28°
February40°34°28°
March43°36°30°
April50°42°34°
May57°49°40°
June63°54°46°
July66°58°51°
August65°58°50°
September59°52°45°
October51°44°38°
November42°37°32°
December38°34°30°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January8.0
February6.7
March6.7
April5.3
May4.8
June4.0
July4.5
August6.3
September9.2
October11.7
November10.8
December9.4

Sunrise / Sunset

Daylight Longest: 17h 16m · Shortest: 6h 44m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January8:19 AM3:41 PM7h 22m
February7:21 AM4:39 PM9h 18m
March6:17 AM5:43 PM11h 27m
April5:04 AM6:56 PM13h 53m
May4:00 AM7:60 PM15h 59m
June3:23 AM8:37 PM17h 13m
July3:39 AM8:21 PM16h 42m
August4:36 AM7:24 PM14h 49m
September5:47 AM6:13 PM12h 26m
October6:57 AM5:03 PM10h 05m
November8:02 AM3:58 PM7h 55m
December8:37 AM3:23 PM6h 46m

Nearby Stations

Klawock AP, AK April 29 - October 16 Craig, AKApril 14 - November 1 Ketchikan 10n, AK April 20 - October 26 Ketchikan Intl AP, AK April 22 - October 23 Beaver Falls, AK April 4 - November 9 Wrangell AP, AK April 11 - November 1

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