Frost Dates for Port San Juan, AK

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 10
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 7
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 17
First Fall Frost October 2

Hard Freeze (28°F / -2°C)

Last Spring Hard Freeze April 23
First Fall Hard Freeze October 25
60.05°N, -148.07°W © OpenStreetMap

Growing Season

150 Days May 10 to October 7

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

Learn more

Temperature

20° 40° 60°
30°
High: 34°
Avg: 30°
Low: 26°
Jan
31°
High: 35°
Avg: 31°
Low: 26°
Feb
31°
High: 36°
Avg: 31°
Low: 26°
Mar
37°
High: 43°
Avg: 37°
Low: 32°
Apr
45°
High: 52°
Avg: 45°
Low: 37°
May
52°
High: 59°
Avg: 52°
Low: 44°
Jun
56°
High: 63°
Avg: 56°
Low: 50°
Jul
55°
High: 61°
Avg: 55°
Low: 49°
Aug
49°
High: 54°
Avg: 49°
Low: 44°
Sep
41°
High: 45°
Avg: 41°
Low: 36°
Oct
34°
High: 38°
Avg: 34°
Low: 30°
Nov
32°
High: 36°
Avg: 32°
Low: 28°
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 5" 10" 15" 17.4"
13.0"
12.97"
Jan
10.9"
10.91"
Feb
11.0"
11.03"
Mar
10.5"
10.47"
Apr
8.6"
8.58"
May
5.2"
5.17"
Jun
6.3"
6.30"
Jul
11.4"
11.38"
Aug
16.0"
15.97"
Sep
17.4"
17.36"
Oct
16.8"
16.81"
Nov
15.4"
15.39"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec6h9h11h14h17h18h18h15h13h10h7h6h
Jan: 8:50 AM – 3:10 PM · 6h 20m
Feb: 7:37 AM – 4:23 PM · 8h 46m
Mar: 6:20 AM – 5:40 PM · 11h 21m
Apr: 4:53 AM – 7:07 PM · 14h 14m
May: 3:35 AM – 8:25 PM · 16h 50m
Jun: 2:46 AM – 9:14 PM · 18h 27m
Jul: 3:07 AM – 8:53 PM · 17h 45m
Aug: 4:19 AM – 7:41 PM · 15h 22m
Sep: 5:45 AM – 6:15 PM · 12h 31m
Oct: 7:08 AM – 4:52 PM · 9h 43m
Nov: 8:28 AM – 3:32 PM · 7h 04m
Dec: 9:14 AM – 2:46 PM · 5h 32m
Daylight Longest: 18h 31m · Shortest: 5h 29m

Nearby Stations

Main Bay, AKMay 19 - October 6 Seward AP, AKMay 2 - October 7 Seward 19n, AK May 21 - September 26 Wally Noerenberg Hatchery, AK May 20 - October 9 Whittier, AKApril 25 - October 14 Seward 8 Nw, AK

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