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🍂 First Frost Dates for Juneau, Alaska 99801

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 Oct 6. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Juneau, 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 8
20% chanceSep 15
30% chanceSep 20
40% chanceSep 22
50% chanceSep 25
60% chanceSep 28
70% chanceSep 30
80% chanceOct 4
90% chanceOct 9
Probability of light freeze (32°F) on or before...
10% chanceSep 28
20% chanceOct 2
30% chanceOct 6
40% chanceOct 10
50% chanceOct 13
60% chanceOct 17
70% chanceOct 20
80% chanceOct 23
90% chanceOct 26
Probability of moderate freeze (28°F) on or before...
10% chanceOct 12
20% chanceOct 19
30% chanceOct 23
40% chanceOct 26
50% chanceOct 29
60% chanceOct 31
70% chanceNov 3
80% chanceNov 7
90% chanceNov 12
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 28
20% chanceNov 1
30% chanceNov 5
40% chanceNov 8
50% chanceNov 11
60% chanceNov 14
70% chanceNov 18
80% chanceNov 23
90% chanceNov 30
Probability of hard freeze (20°F) on or before...
10% chanceNov 5
20% chanceNov 10
30% chanceNov 14
40% chanceNov 18
50% chanceNov 22
60% chanceNov 25
70% chanceNov 30
80% chanceDec 5
90% chanceDec 12
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 10
20% chanceNov 17
30% chanceNov 22
40% chanceNov 26
50% chanceDec 1
60% chanceDec 5
70% chanceDec 10
80% chanceDec 16
90% chanceDec 26

Agricultural climatic data from weather station: ANNEX CREEK (USC00500363)

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