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🍂 First Frost Dates for Eagle River, Alaska 99577

The first 36°F frost date is 30% likely to be on Aug 29. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 8. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Eagle River, 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 19
20% chanceAug 25
30% chanceAug 29
40% chanceSep 1
50% chanceSep 3
60% chanceSep 5
70% chanceSep 8
80% chanceSep 12
90% chanceSep 16
Probability of light freeze (32°F) on or before...
10% chanceSep 1
20% chanceSep 5
30% chanceSep 8
40% chanceSep 11
50% chanceSep 14
60% chanceSep 17
70% chanceSep 20
80% chanceSep 23
90% chanceSep 27
Probability of moderate freeze (28°F) on or before...
10% chanceSep 10
20% chanceSep 15
30% chanceSep 19
40% chanceSep 22
50% chanceSep 25
60% chanceSep 27
70% chanceSep 30
80% chanceOct 3
90% chanceOct 8
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 22
20% chanceSep 26
30% chanceSep 30
40% chanceOct 1
50% chanceOct 4
60% chanceOct 7
70% chanceOct 11
80% chanceOct 14
90% chanceOct 18
Probability of hard freeze (20°F) on or before...
10% chanceOct 1
20% chanceOct 5
30% chanceOct 8
40% chanceOct 11
50% chanceOct 14
60% chanceOct 17
70% chanceOct 20
80% chanceOct 23
90% chanceOct 26
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 7
20% chanceOct 12
30% chanceOct 16
40% chanceOct 19
50% chanceOct 21
60% chanceOct 24
70% chanceOct 26
80% chanceOct 29
90% chanceNov 3

Agricultural climatic data from weather station: EAGLE RIVER 5 SE (USC00502656)

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