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🍂 First Frost Dates for Anchorage, Alaska 99530

The first 36°F frost date is 30% likely to be on Sep 20. (See detailed probabilities below.)

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

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Anchorage, 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% chanceSep 13
20% chanceSep 17
30% chanceSep 20
40% chanceSep 22
50% chanceSep 25
60% chanceSep 27
70% chanceSep 29
80% chanceOct 2
90% chanceOct 7
Probability of light freeze (32°F) on or before...
10% chanceSep 23
20% chanceSep 27
30% chanceSep 30
40% chanceOct 1
50% chanceOct 4
60% chanceOct 7
70% chanceOct 10
80% chanceOct 13
90% chanceOct 16
Probability of moderate freeze (28°F) on or before...
10% chanceOct 1
20% chanceOct 5
30% chanceOct 8
40% chanceOct 11
50% chanceOct 14
60% chanceOct 16
70% chanceOct 19
80% chanceOct 21
90% chanceOct 25
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 9
20% chanceOct 14
30% chanceOct 17
40% chanceOct 20
50% chanceOct 22
60% chanceOct 24
70% chanceOct 26
80% chanceOct 29
90% chanceNov 2
Probability of hard freeze (20°F) on or before...
10% chanceOct 17
20% chanceOct 21
30% chanceOct 23
40% chanceOct 26
50% chanceOct 28
60% chanceOct 30
70% chanceNov 1
80% chanceNov 5
90% chanceNov 9
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 22
20% chanceOct 26
30% chanceOct 28
40% chanceOct 31
50% chanceNov 2
60% chanceNov 5
70% chanceNov 7
80% chanceNov 11
90% chanceNov 17

Agricultural climatic data from weather station: ANCHORAGE LAKE HOOD AP (USW00026491)

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