Frost Dates for Ft Knox Mine, AK

Elevation: 494 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. May 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. September 17

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 May 17
First Fall Frost September 9

Hard Freeze (28°F)

Last Spring Hard Freeze May 4
First Fall Hard Freeze September 26
65.00°N, 147.34°W © OpenStreetMap

Growing Season

128 Days May 12 to September 17

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 3b

Avg. annual minimum: −35 to −30°F

Learn more

Köppen Climate

The 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

Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January10°4°-3°
February17°9°1°
March23°15°6°
April41°32°23°
May57°48°39°
June67°58°49°
July68°60°52°
August61°54°46°
September50°44°37°
October32°27°21°
November17°11°6°
December13°6°-1°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January1.8
February2.2
March1.7
April1.5
May2.0
June2.9
July3.9
August3.7
September2.9
October2.4
November1.8
December1.6

Sunrise / Sunset

Daylight Longest: 21h 08m · Shortest: 2h 52m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January9:46 AM2:14 PM4h 27m
February8:02 AM3:58 PM7h 57m
March6:24 AM5:36 PM11h 12m
April4:37 AM7:23 PM14h 47m
May2:53 AM9:07 PM18h 15m
June1:30 AM10:30 PM21h 01m
July2:09 AM9:51 PM19h 42m
August3:53 AM8:07 PM16h 14m
September5:41 AM6:19 PM12h 38m
October7:25 AM4:35 PM9h 10m
November9:13 AM2:47 PM5h 35m
December10:31 AM1:29 PM2h 58m

Nearby Stations

Fairbanks 11 Ne, AK May 12 - September 16 Gilmore Creek, AK June 1 - August 28 Fox 2 Se, AKMay 28 - September 1 Two Rivers, AK May 30 - September 2 Aurora, AKMay 16 - September 6 Mile 42 Steese, AK May 28 - August 26

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