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🍂 First Frost Dates for Warren, Illinois 61087

The first 36°F frost date is 30% likely to be on Sep 21. (See detailed probabilities below.)

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

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Warren, 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 13
20% chanceSep 18
30% chanceSep 21
40% chanceSep 24
50% chanceSep 26
60% chanceSep 28
70% chanceOct 1
80% chanceOct 3
90% chanceOct 7
Probability of light freeze (32°F) on or before...
10% chanceSep 23
20% chanceSep 27
30% chanceSep 30
40% chanceOct 2
50% chanceOct 5
60% chanceOct 7
70% chanceOct 10
80% chanceOct 14
90% chanceOct 19
Probability of moderate freeze (28°F) on or before...
10% chanceOct 1
20% chanceOct 6
30% chanceOct 10
40% chanceOct 13
50% chanceOct 16
60% chanceOct 20
70% chanceOct 23
80% chanceOct 27
90% chanceNov 1
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 12
20% chanceOct 18
30% chanceOct 22
40% chanceOct 26
50% chanceOct 29
60% chanceNov 1
70% chanceNov 4
80% chanceNov 8
90% chanceNov 14
Probability of hard freeze (20°F) on or before...
10% chanceOct 24
20% chanceOct 31
30% chanceNov 3
40% chanceNov 7
50% chanceNov 10
60% chanceNov 14
70% chanceNov 18
80% chanceNov 22
90% chanceNov 26
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 4
20% chanceNov 10
30% chanceNov 15
40% chanceNov 19
50% chanceNov 22
60% chanceNov 25
70% chanceNov 28
80% chanceDec 1
90% chanceDec 6

Agricultural climatic data from weather station: STOCKTON 3 NNE (USC00118293)

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