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🍂 First Frost Dates for Union, Maine 04862

The first 36°F frost date is 30% likely to be on Sep 28. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 7. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Union, 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 21
20% chanceSep 25
30% chanceSep 28
40% chanceOct 1
50% chanceOct 3
60% chanceOct 5
70% chanceOct 7
80% chanceOct 11
90% chanceOct 15
Probability of light freeze (32°F) on or before...
10% chanceSep 30
20% chanceOct 4
30% chanceOct 7
40% chanceOct 10
50% chanceOct 13
60% chanceOct 16
70% chanceOct 19
80% chanceOct 22
90% chanceOct 28
Probability of moderate freeze (28°F) on or before...
10% chanceOct 10
20% chanceOct 15
30% chanceOct 19
40% chanceOct 22
50% chanceOct 25
60% chanceOct 29
70% chanceNov 1
80% chanceNov 3
90% chanceNov 8
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 20
20% chanceOct 28
30% chanceNov 1
40% chanceNov 4
50% chanceNov 6
60% chanceNov 10
70% chanceNov 13
80% chanceNov 16
90% chanceNov 21
Probability of hard freeze (20°F) on or before...
10% chanceNov 3
20% chanceNov 10
30% chanceNov 14
40% chanceNov 17
50% chanceNov 19
60% chanceNov 22
70% chanceNov 25
80% chanceNov 28
90% chanceDec 2
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 16
20% chanceNov 21
30% chanceNov 24
40% chanceNov 27
50% chanceNov 29
60% chanceDec 1
70% chanceDec 4
80% chanceDec 7
90% chanceDec 13

Agricultural climatic data from weather station: WEST ROCKPORT 1 NNW (USC00179593)

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