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🍂 First Frost Dates for Hanover, Illinois 61041

The first 36°F frost date is 30% likely to be on Sep 19. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 27. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Hanover, IL 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 11
20% chanceSep 16
30% chanceSep 19
40% chanceSep 22
50% chanceSep 24
60% chanceSep 26
70% chanceSep 29
80% chanceOct 1
90% chanceOct 5
Probability of light freeze (32°F) on or before...
10% chanceSep 19
20% chanceSep 23
30% chanceSep 27
40% chanceSep 29
50% chanceOct 1
60% chanceOct 4
70% chanceOct 7
80% chanceOct 10
90% chanceOct 15
Probability of moderate freeze (28°F) on or before...
10% chanceSep 27
20% chanceOct 1
30% chanceOct 5
40% chanceOct 8
50% chanceOct 12
60% chanceOct 14
70% chanceOct 18
80% chanceOct 22
90% chanceOct 27
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 7
20% chanceOct 12
30% chanceOct 16
40% chanceOct 20
50% chanceOct 23
60% chanceOct 27
70% chanceOct 30
80% chanceNov 2
90% chanceNov 8
Probability of hard freeze (20°F) on or before...
10% chanceOct 17
20% chanceOct 22
30% chanceOct 28
40% chanceOct 31
50% chanceNov 3
60% chanceNov 7
70% chanceNov 11
80% chanceNov 16
90% chanceNov 22
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 29
20% chanceNov 2
30% chanceNov 7
40% chanceNov 12
50% chanceNov 16
60% chanceNov 20
70% chanceNov 24
80% chanceNov 28
90% chanceDec 3

Agricultural climatic data from weather station: ELIZABETH (USC00112745)

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