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🍂 First Frost Dates for Forrest, Illinois 61741

The first 36°F frost date is 30% likely to be on Sep 27. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 6. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Forrest, 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 18
20% chanceSep 23
30% chanceSep 27
40% chanceSep 30
50% chanceOct 2
60% chanceOct 5
70% chanceOct 7
80% chanceOct 11
90% chanceOct 16
Probability of light freeze (32°F) on or before...
10% chanceSep 28
20% chanceOct 2
30% chanceOct 6
40% chanceOct 10
50% chanceOct 14
60% chanceOct 17
70% chanceOct 21
80% chanceOct 25
90% chanceOct 30
Probability of moderate freeze (28°F) on or before...
10% chanceOct 8
20% chanceOct 16
30% chanceOct 21
40% chanceOct 24
50% chanceOct 28
60% chanceOct 31
70% chanceNov 2
80% chanceNov 6
90% chanceNov 11
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 21
20% chanceOct 28
30% chanceNov 1
40% chanceNov 4
50% chanceNov 8
60% chanceNov 11
70% chanceNov 15
80% chanceNov 19
90% chanceNov 24
Probability of hard freeze (20°F) on or before...
10% chanceNov 1
20% chanceNov 6
30% chanceNov 11
40% chanceNov 15
50% chanceNov 19
60% chanceNov 23
70% chanceNov 26
80% chanceNov 30
90% chanceDec 5
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 10
20% chanceNov 18
30% chanceNov 23
40% chanceNov 27
50% chanceNov 30
60% chanceDec 2
70% chanceDec 6
80% chanceDec 11
90% chanceDec 17

Agricultural climatic data from weather station: PIPER CITY (USC00116819)

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