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🍂 First Frost Dates for Vergennes, Illinois 62994

The first 36°F frost date is 30% likely to be on Oct 6. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 17. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Vergennes, 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 29
20% chanceOct 2
30% chanceOct 6
40% chanceOct 9
50% chanceOct 11
60% chanceOct 14
70% chanceOct 17
80% chanceOct 20
90% chanceOct 25
Probability of light freeze (32°F) on or before...
10% chanceOct 8
20% chanceOct 13
30% chanceOct 17
40% chanceOct 20
50% chanceOct 22
60% chanceOct 25
70% chanceOct 28
80% chanceNov 1
90% chanceNov 6
Probability of moderate freeze (28°F) on or before...
10% chanceOct 18
20% chanceOct 24
30% chanceOct 27
40% chanceOct 31
50% chanceNov 3
60% chanceNov 6
70% chanceNov 10
80% chanceNov 15
90% chanceNov 23
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 30
20% chanceNov 5
30% chanceNov 9
40% chanceNov 14
50% chanceNov 18
60% chanceNov 22
70% chanceNov 27
80% chanceDec 1
90% chanceDec 7
Probability of hard freeze (20°F) on or before...
10% chanceNov 11
20% chanceNov 19
30% chanceNov 25
40% chanceNov 29
50% chanceDec 2
60% chanceDec 5
70% chanceDec 9
80% chanceDec 14
90% chanceDec 22
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 25
20% chanceDec 1
30% chanceDec 5
40% chanceDec 9
50% chanceDec 13
60% chanceDec 17
70% chanceDec 22
80% chanceDec 27
90% chanceJan 1

Agricultural climatic data from weather station: CARBONDALE SOUTHERN IL AP (USW00093810)

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