Frost Dates for Big River Lakes, AK

Elevation: 18 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 7
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. October 7

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 13
First Fall Frost October 1

Hard Freeze (28°F)

Last Spring Hard Freeze April 23
First Fall Hard Freeze October 19
60.81°N, 152.30°W © OpenStreetMap

Growing Season

153 Days May 7 to October 7

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
January25°19°13°
February31°24°18°
March35°28°20°
April46°38°31°
May59°49°39°
June67°57°47°
July69°60°51°
August67°59°50°
September58°51°44°
October46°40°34°
November32°27°22°
December27°22°17°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January8.5
February6.7
March6.2
April4.9
May5.0
June4.8
July6.7
August8.7
September11.2
October9.5
November7.9
December8.2

Sunrise / Sunset

Daylight Longest: 18h 48m · Shortest: 5h 13m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January8:57 AM3:03 PM6h 07m
February7:40 AM4:20 PM8h 40m
March6:20 AM5:40 PM11h 20m
April4:51 AM7:09 PM14h 18m
May3:30 AM8:30 PM17h 00m
June2:38 AM9:22 PM18h 44m
July3:00 AM8:60 PM17h 59m
August4:16 AM7:44 PM15h 28m
September5:44 AM6:16 PM12h 32m
October7:11 AM4:49 PM9h 39m
November8:34 AM3:26 PM6h 53m
December9:22 AM2:38 PM5h 15m

Nearby Stations

Kenai 9n, AKMay 18 - September 22 Kenai Muni AP, AK May 24 - September 12 Soldotna 5ssw, AK June 11 - September 1 Homer 8 Nw, AK May 16 - September 30 Hayes River, AK June 2 - September 8 Homer 9 E, AK May 27 - September 22

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