Frost Dates for Keystone Ridge, AK

Elevation: 488 m

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 15
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. September 16
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 22
First Fall Frost September 9

Hard Freeze (28°F)

Last Spring Hard Freeze May 7
First Fall Hard Freeze September 25
64.92°N, -148.27°W © OpenStreetMap

Growing Season

124 Days May 15 to September 16

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 3b

Avg. annual minimum: −35 to −30°F

Learn more

Köppen Climate iThe Köppen climate classification system categorizes climates based on temperature and precipitation patterns.

Dfc Subarctic

Short, cool summers and long, very cold winters. Growing seasons of 3–4 months require fast-maturing varieties. Root vegetables, potatoes, and cold-hardy greens are the most reliable.

Köppen climate map

Temperature

-10° 10° 30° 50° 70°
4°
High: 10°F
Avg: 4°F
Low: -1°F
Jan
11°
High: 17°F
Avg: 11°F
Low: 4°F
Feb
16°
High: 23°F
Avg: 16°F
Low: 8°F
Mar
33°
High: 42°F
Avg: 33°F
Low: 25°F
Apr
48°
High: 58°F
Avg: 48°F
Low: 38°F
May
58°
High: 68°F
Avg: 58°F
Low: 49°F
Jun
60°
High: 69°F
Avg: 60°F
Low: 51°F
Jul
54°
High: 61°F
Avg: 54°F
Low: 47°F
Aug
43°
High: 50°F
Avg: 43°F
Low: 37°F
Sep
27°
High: 32°F
Avg: 27°F
Low: 22°F
Oct
12°
High: 18°F
Avg: 12°F
Low: 7°F
Nov
8°
High: 14°F
Avg: 8°F
Low: 2°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 1" 2" 3" 3.2"
1.3"
1.28"
Jan
1.1"
1.12"
Feb
1.1"
1.10"
Mar
1.6"
1.65"
Apr
1.6"
1.59"
May
2.2"
2.23"
Jun
3.0"
3.05"
Jul
3.2"
3.16"
Aug
1.9"
1.91"
Sep
1.5"
1.51"
Oct
1.2"
1.20"
Nov
1.3"
1.30"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec4.5h8h11h15h18h21h19.5h16h12.5h9h5.5h3h
Jan: 9:45 AM – 2:15 PM · 4h 30m
Feb: 8:01 AM – 3:59 PM · 7h 58m
Mar: 6:24 AM – 5:36 PM · 11h 12m
Apr: 4:37 AM – 7:23 PM · 14h 46m
May: 2:53 AM – 9:07 PM · 18h 13m
Jun: 1:32 AM – 10:28 PM · 20h 56m
Jul: 2:10 AM – 9:50 PM · 19h 39m
Aug: 3:54 AM – 8:06 PM · 16h 13m
Sep: 5:41 AM – 6:19 PM · 12h 38m
Oct: 7:25 AM – 4:35 PM · 9h 11m
Nov: 9:12 AM – 2:48 PM · 5h 37m
Dec: 10:29 AM – 1:31 PM · 3h 03m
Daylight Longest: 21h 03m · Shortest: 2h 57m

Nearby Stations

Ester, AKMay 24 - September 1 Ester 5ne, AK College 5 Nw, AK May 13 - September 15 Goldstream Creek, AK University Exp Stn, AK May 16 - September 8 College Obsy, AK May 18 - September 6

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