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🍂 First Frost Dates for Ketchikan, Alaska 99901

The first 36°F frost date is 30% likely to be on Sep 27. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 10. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Ketchikan, 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 18
20% chanceSep 23
30% chanceSep 27
40% chanceSep 30
50% chanceOct 2
60% chanceOct 5
70% chanceOct 8
80% chanceOct 12
90% chanceOct 17
Probability of light freeze (32°F) on or before...
10% chanceSep 30
20% chanceOct 5
30% chanceOct 10
40% chanceOct 14
50% chanceOct 18
60% chanceOct 22
70% chanceOct 26
80% chanceOct 30
90% chanceNov 4
Probability of moderate freeze (28°F) on or before...
10% chanceOct 13
20% chanceOct 22
30% chanceOct 27
40% chanceOct 31
50% chanceNov 3
60% chanceNov 7
70% chanceNov 12
80% chanceNov 20
90% chanceNov 29
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 30
20% chanceNov 6
30% chanceNov 12
40% chanceNov 19
50% chanceNov 24
60% chanceNov 30
70% chanceDec 5
80% chanceDec 13
90% chanceDec 26
Probability of hard freeze (20°F) on or before...
10% chanceNov 12
20% chanceNov 22
30% chanceNov 29
40% chanceDec 5
50% chanceDec 11
60% chanceDec 18
70% chanceDec 26
80% chanceJan 2
90% chanceJan 16
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 23
20% chanceDec 1
30% chanceDec 10
40% chanceDec 19
50% chanceDec 26
60% chanceJan 1
70% chanceJan 8
80% chanceJan 17
90% chanceFeb 2

Agricultural climatic data from weather station: KETCHIKAN INTL AP (USW00025325)

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