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🍂 First Frost Dates for Louisville, Illinois 62858

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

The first 32°F light freeze date is 30% likely to be on Oct 8. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Louisville, 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 19
20% chanceSep 25
30% chanceSep 30
40% chanceOct 2
50% chanceOct 5
60% chanceOct 8
70% chanceOct 11
80% chanceOct 15
90% chanceOct 20
Probability of light freeze (32°F) on or before...
10% chanceSep 30
20% chanceOct 4
30% chanceOct 8
40% chanceOct 13
50% chanceOct 16
60% chanceOct 20
70% chanceOct 23
80% chanceOct 27
90% chanceNov 1
Probability of moderate freeze (28°F) on or before...
10% chanceOct 10
20% chanceOct 17
30% chanceOct 22
40% chanceOct 26
50% chanceOct 29
60% chanceNov 1
70% chanceNov 4
80% chanceNov 8
90% chanceNov 14
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 23
20% chanceOct 30
30% chanceNov 3
40% chanceNov 6
50% chanceNov 10
60% chanceNov 14
70% chanceNov 18
80% chanceNov 23
90% chanceNov 29
Probability of hard freeze (20°F) on or before...
10% chanceNov 2
20% chanceNov 9
30% chanceNov 15
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 29
40% chanceDec 2
50% chanceDec 5
60% chanceDec 8
70% chanceDec 13
80% chanceDec 18
90% chanceDec 23

Agricultural climatic data from weather station: FLORA 5 NW (USC00113109)

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