Frost Dates for Ft Richardson Wtp, AK

Elevation: 143 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 9
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 26

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 14
First Fall Frost September 19

Hard Freeze (28°F)

Last Spring Hard Freeze April 28
First Fall Hard Freeze October 6
61.23°N, 149.65°W © OpenStreetMap

Growing Season

140 Days May 9 to September 26

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 5b

Avg. annual minimum: −15 to −10°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Dsc Subarctic (Dry Summer)

Cool, dry summers and cold winters. A rare climate found at high elevations. Very short growing season for cold-tolerant crops only.

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
January21°15°8°
February28°20°12°
March33°24°15°
April46°37°28°
May57°47°38°
June64°55°46°
July66°58°50°
August64°56°48°
September55°48°40°
October42°35°28°
November28°21°15°
December24°18°11°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January2.7
February2.0
March2.2
April2.0
May1.9
June2.2
July2.7
August3.0
September3.0
October3.1
November2.9
December3.1

Sunrise / Sunset

Daylight Alaska Time (AKT) Longest: 18h 57m · Shortest: 5h 03m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Alaska Time (AKT))
Month Sunrise Sunset Daylight
January10:09 AM4:07 PM5h 59m
February8:55 AM5:31 PM8h 36m
March8:29 AM7:48 PM11h 19m
April6:49 AM9:09 PM14h 21m
May5:22 AM10:28 PM17h 06m
June4:32 AM11:26 PM18h 54m
July5:01 AM11:08 PM18h 07m
August6:17 AM9:49 PM15h 32m
September7:37 AM8:09 PM12h 32m
October8:55 AM6:32 PM9h 36m
November9:21 AM4:07 PM6h 46m
December10:22 AM3:27 PM5h 06m

Nearby Stations

Campbell Creek Sci Ctr, AK May 28 - September 12 Anchorage Merrill Fld, AK May 1 - September 29 Eagle Rvr Gakona Circle, AK May 9 - September 26 Eagle Rvr 5 Se, AK May 21 - September 15 Anchorage Upper De Armoun, AK May 7 - September 28 Glen Alps, AK May 18 - September 23

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