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🍂 First Frost Dates for Port Alexander, Alaska 99836

The first 36°F frost date is 30% likely to be on Oct 3. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 23. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Port Alexander, 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 24
20% chanceSep 30
30% chanceOct 3
40% chanceOct 5
50% chanceOct 9
60% chanceOct 13
70% chanceOct 16
80% chanceOct 20
90% chanceOct 25
Probability of light freeze (32°F) on or before...
10% chanceOct 13
20% chanceOct 18
30% chanceOct 23
40% chanceOct 27
50% chanceOct 30
60% chanceNov 2
70% chanceNov 6
80% chanceNov 10
90% chanceNov 19
Probability of moderate freeze (28°F) on or before...
10% chanceOct 29
20% chanceNov 3
30% chanceNov 8
40% chanceNov 13
50% chanceNov 19
60% chanceNov 26
70% chanceDec 1
80% chanceDec 9
90% chanceDec 21
Probability of moderate hard freeze (24°F) on or before...
10% chanceNov 10
20% chanceNov 20
30% chanceNov 28
40% chanceDec 4
50% chanceDec 13
60% chanceDec 22
70% chanceDec 30
80% chanceJan 8
90% chanceJan 24
Probability of hard freeze (20°F) on or before...
10% chanceNov 23
20% chanceDec 3
30% chanceDec 15
40% chanceDec 26
50% chanceJan 1
60% chanceJan 9
70% chanceJan 18
80% chanceJan 29
90% chanceFeb 14
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 29
20% chanceDec 14
30% chanceDec 28
40% chanceJan 3
50% chanceJan 11
60% chanceJan 17
70% chanceJan 27
80% chanceFeb 5
90% chanceFeb 20

Agricultural climatic data from weather station: PORT ALEXANDER (USC00507557)

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