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🍂 First Frost Dates for Fairbanks, Alaska 99775

The first 36°F frost date is 30% likely to be on Aug 17. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Aug 29. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Fairbanks, 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 8
20% chanceAug 13
30% chanceAug 17
40% chanceAug 20
50% chanceAug 23
60% chanceAug 26
70% chanceAug 29
80% chanceSep 1
90% chanceSep 5
Probability of light freeze (32°F) on or before...
10% chanceAug 19
20% chanceAug 25
30% chanceAug 29
40% chanceSep 1
50% chanceSep 3
60% chanceSep 6
70% chanceSep 10
80% chanceSep 14
90% chanceSep 18
Probability of moderate freeze (28°F) on or before...
10% chanceAug 31
20% chanceSep 4
30% chanceSep 9
40% chanceSep 13
50% chanceSep 16
60% chanceSep 19
70% chanceSep 22
80% chanceSep 25
90% chanceSep 29
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 10
20% chanceSep 16
30% chanceSep 20
40% chanceSep 23
50% chanceSep 26
60% chanceSep 29
70% chanceOct 1
80% chanceOct 5
90% chanceOct 9
Probability of hard freeze (20°F) on or before...
10% chanceSep 20
20% chanceSep 26
30% chanceSep 29
40% chanceOct 1
50% chanceOct 4
60% chanceOct 7
70% chanceOct 10
80% chanceOct 13
90% chanceOct 17
Probability of severe hard freeze (16°F) on or before...
10% chanceSep 28
20% chanceOct 2
30% chanceOct 5
40% chanceOct 8
50% chanceOct 11
60% chanceOct 13
70% chanceOct 16
80% chanceOct 19
90% chanceOct 22

Agricultural climatic data from weather station: COLLEGE OBSY (USC00502107)

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