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🍂 First Frost Dates for Stonington, Illinois 62567

The first 36°F frost date is 30% likely to be on Sep 29. (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 Stonington, 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 20
20% chanceSep 25
30% chanceSep 29
40% chanceOct 1
50% chanceOct 3
60% chanceOct 6
70% chanceOct 9
80% chanceOct 13
90% chanceOct 19
Probability of light freeze (32°F) on or before...
10% chanceSep 29
20% chanceOct 3
30% chanceOct 7
40% chanceOct 10
50% chanceOct 14
60% chanceOct 17
70% chanceOct 21
80% chanceOct 26
90% chanceOct 31
Probability of moderate freeze (28°F) on or before...
10% chanceOct 7
20% chanceOct 14
30% chanceOct 18
40% chanceOct 23
50% chanceOct 27
60% chanceOct 31
70% chanceNov 3
80% chanceNov 7
90% chanceNov 13
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 20
20% chanceOct 28
30% chanceNov 1
40% chanceNov 5
50% chanceNov 9
60% chanceNov 13
70% chanceNov 17
80% chanceNov 22
90% chanceNov 29
Probability of hard freeze (20°F) on or before...
10% chanceNov 2
20% chanceNov 9
30% chanceNov 14
40% chanceNov 19
50% chanceNov 24
60% chanceNov 28
70% chanceDec 1
80% chanceDec 5
90% chanceDec 11
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 14
20% chanceNov 23
30% chanceNov 28
40% chanceDec 1
50% chanceDec 4
60% chanceDec 7
70% chanceDec 12
80% chanceDec 17
90% chanceDec 23

Agricultural climatic data from weather station: MOWEAQUA 2S (USC00115950)

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