Frost Dates for Sitka, AK

Based on data from Sitka 1 Ne weather station, 0 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 3
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. October 18
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 10
First Fall Frost October 10

Hard Freeze (28°F)

Last Spring Hard Freeze April 7
First Fall Hard Freeze November 10
57.05°N, -135.33°W © OpenStreetMap

Growing Season

168 Days May 3 to October 18

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 7b

Avg. annual minimum: 5 to 10°F (−15 to −12°C)

Learn more

Köppen Climate iThe 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

20° 40° 60°
33°
High: 37°F
Avg: 33°F
Low: 29°F
Jan
34°
High: 39°F
Avg: 34°F
Low: 30°F
Feb
36°
High: 42°F
Avg: 36°F
Low: 30°F
Mar
41°
High: 49°F
Avg: 41°F
Low: 34°F
Apr
47°
High: 54°F
Avg: 47°F
Low: 39°F
May
52°
High: 58°F
Avg: 52°F
Low: 45°F
Jun
55°
High: 60°F
Avg: 55°F
Low: 50°F
Jul
56°
High: 62°F
Avg: 56°F
Low: 50°F
Aug
51°
High: 57°F
Avg: 51°F
Low: 45°F
Sep
44°
High: 49°F
Avg: 44°F
Low: 39°F
Oct
37°
High: 42°F
Avg: 37°F
Low: 33°F
Nov
34°
High: 38°F
Avg: 34°F
Low: 30°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 4" 8" 12" 13.1"
8.4"
8.37"
Jan
7.1"
7.07"
Feb
7.1"
7.10"
Mar
5.0"
5.05"
Apr
3.8"
3.75"
May
3.3"
3.27"
Jun
4.8"
4.76"
Jul
8.1"
8.08"
Aug
12.3"
12.31"
Sep
13.1"
13.13"
Oct
10.3"
10.35"
Nov
9.1"
9.07"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec7h9h11.5h14h16h17.5h17h15h12.5h10h7.5h6.5h
Jan: 8:28 AM – 3:32 PM · 7h 05m
Feb: 7:26 AM – 4:34 PM · 9h 09m
Mar: 6:17 AM – 5:43 PM · 11h 25m
Apr: 5:01 AM – 6:59 PM · 13h 59m
May: 3:53 AM – 8:07 PM · 16h 13m
Jun: 3:13 AM – 8:47 PM · 17h 34m
Jul: 3:30 AM – 8:30 PM · 16h 60m
Aug: 4:31 AM – 7:29 PM · 14h 58m
Sep: 5:46 AM – 6:14 PM · 12h 27m
Oct: 7:01 AM – 4:59 PM · 9h 59m
Nov: 8:10 AM – 3:50 PM · 7h 41m
Dec: 8:47 AM – 3:13 PM · 6h 26m
Daylight Longest: 17h 36m · Shortest: 6h 24m

Nearby Stations

Sitka Airport, AK April 12 - November 1 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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