Frost Dates for Sitka Airport, AK

Elevation: 4 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 12
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. November 1

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 20
First Fall Frost October 25

Hard Freeze (28°F)

Last Spring Hard Freeze March 24
First Fall Hard Freeze November 22
57.05°N, 135.36°W © OpenStreetMap

Growing Season

203 Days April 12 to November 1

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 8a

Avg. annual minimum: 10 to 15°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
January41°36°32°
February41°37°32°
March43°38°33°
April48°43°37°
May53°48°43°
June58°53°48°
July60°56°53°
August62°57°53°
September58°53°49°
October51°46°42°
November44°40°36°
December42°38°33°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January7.3
February6.3
March6.2
April4.4
May3.8
June3.2
July4.4
August6.7
September9.9
October11.1
November9.5
December8.1

Sunrise / Sunset

Daylight Longest: 17h 36m · Shortest: 6h 24m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January8:28 AM3:32 PM7h 05m
February7:25 AM4:35 PM9h 09m
March6:17 AM5:43 PM11h 25m
April5:01 AM6:59 PM13h 59m
May3:53 AM8:07 PM16h 13m
June3:13 AM8:47 PM17h 33m
July3:30 AM8:30 PM16h 60m
August4:31 AM7:29 PM14h 58m
September5:46 AM6:14 PM12h 27m
October7:00 AM4:60 PM9h 59m
November8:10 AM3:50 PM7h 41m
December8:47 AM3:13 PM6h 26m

Nearby Stations

Sitka 1 Ne, AKMay 3 - October 18 Hidden Falls Hatchery, AK April 29 - October 25 Little Port Walter, AK April 21 - October 31 Port Alexander, AK April 18 - November 5 Pelican, AKMay 4 - October 19 Hoonah, AKMay 9 - October 4

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