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🍂 2026 First Frost Dates for Wasilla, Alaska 99654

The first 36°F frost date is 30% likely to be on Aug 31. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 11. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Wasilla, AK are based on historical climate data.

Always check your local forecast for the most up-to-date frost warnings.

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What is a First Frost Date?

The first fall frost signals the end of your local growing season. This date serves as an important deadline for gardeners and farmers. You'll need to complete harvesting before this point. Annuals and other tender plants will die back when frost hits, and perennial plants will enter their dormant phase for winter. Meanwhile, it's time to enjoy a cup of hot cocoa and a cozy sweater—and start planning your spring garden!

How to use the First Frost Date?

Watch your local weather forecasts in early fall to predict the first frost date. Harvest tender crops and protect vulnerable plants before frost arrives. For late-summer plantings, count backward from your area's average first frost date. This ensures your crops have enough time to mature. Keep track of when frost actually occurs in your garden each year. This helps you identify protected spots where the growing season might last longer.

First Frost Date Probabilities

Probability of frost (36°F) on or before...
10% chanceAug 22
20% chanceAug 27
30% chanceAug 31
40% chanceSep 2
50% chanceSep 4
60% chanceSep 7
70% chanceSep 10
80% chanceSep 15
90% chanceSep 20
Probability of light freeze (32°F) on or before...
10% chanceSep 3
20% chanceSep 7
30% chanceSep 11
40% chanceSep 15
50% chanceSep 18
60% chanceSep 21
70% chanceSep 24
80% chanceSep 27
90% chanceOct 1
Probability of moderate freeze (28°F) on or before...
10% chanceSep 13
20% chanceSep 19
30% chanceSep 23
40% chanceSep 27
50% chanceSep 30
60% chanceOct 2
70% chanceOct 4
80% chanceOct 8
90% chanceOct 13
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 25
20% chanceSep 30
30% chanceOct 2
40% chanceOct 5
50% chanceOct 8
60% chanceOct 11
70% chanceOct 14
80% chanceOct 17
90% chanceOct 21
Probability of hard freeze (20°F) on or before...
10% chanceOct 2
20% chanceOct 7
30% chanceOct 10
40% chanceOct 13
50% chanceOct 16
60% chanceOct 19
70% chanceOct 21
80% chanceOct 24
90% chanceOct 28
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 10
20% chanceOct 15
30% chanceOct 18
40% chanceOct 20
50% chanceOct 23
60% chanceOct 25
70% chanceOct 28
80% chanceOct 31
90% chanceNov 5

Agricultural climatic data from weather station: WASILLA 3 S (USC00509759)

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