Frost Dates for Ketchikan, AK

Based on data from Beaver Falls weather station, 2 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. April 4
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. November 9
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 April 13
First Fall Frost November 1

Hard Freeze (28°F)

Last Spring Hard Freeze March 13
First Fall Hard Freeze November 26
55.34°N, -131.65°W © OpenStreetMap

Growing Season

219 Days April 4 to November 9

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 8a

Avg. annual minimum: 10 to 15°F (−12 to −9°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

30° 40° 50° 60° 70°
36°
High: 39°F
Avg: 36°F
Low: 32°F
Jan
37°
High: 41°F
Avg: 37°F
Low: 33°F
Feb
40°
High: 45°F
Avg: 40°F
Low: 35°F
Mar
45°
High: 52°F
Avg: 45°F
Low: 39°F
Apr
52°
High: 59°F
Avg: 52°F
Low: 45°F
May
57°
High: 64°F
Avg: 57°F
Low: 50°F
Jun
60°
High: 66°F
Avg: 60°F
Low: 54°F
Jul
61°
High: 67°F
Avg: 61°F
Low: 54°F
Aug
55°
High: 60°F
Avg: 55°F
Low: 50°F
Sep
48°
High: 52°F
Avg: 48°F
Low: 43°F
Oct
40°
High: 43°F
Avg: 40°F
Low: 37°F
Nov
36°
High: 40°F
Avg: 36°F
Low: 33°F
Dec
32°F
Avg High Avg Temp Avg Low Light Frost (32°F)

Precipitation

0" 5" 10" 15" 19.1"
16.3"
16.30"
Jan
12.2"
12.16"
Feb
12.2"
12.18"
Mar
8.7"
8.68"
Apr
7.3"
7.28"
May
6.5"
6.45"
Jun
6.4"
6.44"
Jul
10.9"
10.89"
Aug
15.6"
15.64"
Sep
19.1"
19.06"
Oct
18.0"
17.96"
Nov
17.8"
17.82"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec7.5h9.5h11.5h14h16h17h16.5h15h12.5h10h8h7h
Jan: 8:17 AM – 3:43 PM · 7h 26m
Feb: 7:20 AM – 4:40 PM · 9h 20m
Mar: 6:16 AM – 5:44 PM · 11h 27m
Apr: 5:04 AM – 6:56 PM · 13h 51m
May: 4:02 AM – 7:58 PM · 15h 56m
Jun: 3:26 AM – 8:34 PM · 17h 09m
Jul: 3:41 AM – 8:19 PM · 16h 38m
Aug: 4:37 AM – 7:23 PM · 14h 46m
Sep: 5:47 AM – 6:13 PM · 12h 26m
Oct: 6:57 AM – 5:03 PM · 10h 07m
Nov: 8:01 AM – 3:59 PM · 7h 59m
Dec: 8:35 AM – 3:25 PM · 6h 51m
Daylight Longest: 17h 11m · Shortest: 6h 49m

Nearby Stations

Ketchikan Intl AP, AK April 22 - October 23 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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