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🍂 First Frost Dates for Heyworth, Illinois 61745

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 10. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Heyworth, 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 21
20% chanceSep 26
30% chanceSep 29
40% chanceOct 1
50% chanceOct 5
60% chanceOct 7
70% chanceOct 10
80% chanceOct 14
90% chanceOct 19
Probability of light freeze (32°F) on or before...
10% chanceSep 30
20% chanceOct 5
30% chanceOct 10
40% chanceOct 13
50% chanceOct 16
60% chanceOct 19
70% chanceOct 22
80% chanceOct 26
90% chanceOct 31
Probability of moderate freeze (28°F) on or before...
10% chanceOct 11
20% chanceOct 17
30% chanceOct 21
40% chanceOct 25
50% chanceOct 28
60% chanceOct 31
70% chanceNov 3
80% chanceNov 7
90% chanceNov 12
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 23
20% chanceOct 30
30% chanceNov 1
40% chanceNov 5
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 2
20% chanceNov 7
30% chanceNov 12
40% chanceNov 16
50% chanceNov 20
60% chanceNov 23
70% chanceNov 26
80% chanceNov 30
90% chanceDec 6
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 12
20% chanceNov 19
30% chanceNov 23
40% chanceNov 27
50% chanceNov 30
60% chanceDec 2
70% chanceDec 5
80% chanceDec 10
90% chanceDec 15

Agricultural climatic data from weather station: BLOOMINGTON 5W (USC00110764)

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