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🍂 First Frost Dates for Westbrook, Maine 04092

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 5. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Westbrook, ME 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 20
20% chanceSep 24
30% chanceSep 27
40% chanceSep 29
50% chanceOct 1
60% chanceOct 2
70% chanceOct 4
80% chanceOct 7
90% chanceOct 11
Probability of light freeze (32°F) on or before...
10% chanceSep 30
20% chanceOct 3
30% chanceOct 5
40% chanceOct 7
50% chanceOct 10
60% chanceOct 12
70% chanceOct 14
80% chanceOct 17
90% chanceOct 21
Probability of moderate freeze (28°F) on or before...
10% chanceOct 9
20% chanceOct 13
30% chanceOct 16
40% chanceOct 19
50% chanceOct 21
60% chanceOct 23
70% chanceOct 26
80% chanceOct 30
90% chanceNov 3
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 21
20% chanceOct 26
30% chanceOct 29
40% chanceNov 1
50% chanceNov 3
60% chanceNov 6
70% chanceNov 10
80% chanceNov 14
90% chanceNov 18
Probability of hard freeze (20°F) on or before...
10% chanceNov 5
20% chanceNov 10
30% chanceNov 13
40% chanceNov 17
50% chanceNov 20
60% chanceNov 22
70% chanceNov 25
80% chanceNov 29
90% chanceDec 3
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 18
20% chanceNov 23
30% chanceNov 26
40% chanceNov 29
50% chanceDec 1
60% chanceDec 3
70% chanceDec 6
80% chanceDec 10
90% chanceDec 15

Agricultural climatic data from weather station: PORTLAND INTL JETPORT (USW00014764)

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