Frost Dates for Ketchikan Intl AP, AK

Elevation: 23 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. April 22
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 23

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 April 30
First Fall Frost October 15

Hard Freeze (28°F)

Last Spring Hard Freeze March 31
First Fall Hard Freeze November 10
55.36°N, 131.71°W © OpenStreetMap

Growing Season

184 Days April 22 to October 23

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)
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January40°36°32°
February41°36°32°
March44°38°32°
April50°44°37°
May57°50°43°
June61°55°49°
July65°59°53°
August65°59°53°
September59°54°48°
October51°46°41°
November44°40°36°
December40°36°33°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January12.9
February10.6
March9.4
April7.5
May7.8
June5.9
July6.7
August9.6
September11.7
October15.3
November14.3
December13.2

Sunrise / Sunset

Daylight Longest: 17h 11m · Shortest: 6h 49m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January8:17 AM3:43 PM7h 26m
February7:20 AM4:40 PM9h 20m
March6:16 AM5:44 PM11h 27m
April5:04 AM6:56 PM13h 51m
May4:02 AM7:58 PM15h 56m
June3:26 AM8:34 PM17h 09m
July3:41 AM8:19 PM16h 38m
August4:37 AM7:23 PM14h 46m
September5:47 AM6:13 PM12h 26m
October6:57 AM5:03 PM10h 07m
November8:01 AM3:59 PM7h 59m
December8:35 AM3:25 PM6h 51m

Nearby Stations

Beaver Falls, AK April 4 - November 9 Ketchikan 10n, AK April 20 - October 26 Metlakatla 6 S, AK April 14 - October 25 Annette Island AP, AK April 4 - October 31 Thorne Bay, AKMay 1 - October 13 Grey Islet (Aut), BC March 3 - December 6

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