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🍂 First Frost Dates for Smithshire, Illinois 61478

The first 36°F frost date is 30% likely to be on Sep 25. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 4. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Smithshire, 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 22
30% chanceSep 25
40% chanceSep 28
50% chanceSep 30
60% chanceOct 3
70% chanceOct 5
80% chanceOct 8
90% chanceOct 13
Probability of light freeze (32°F) on or before...
10% chanceSep 25
20% chanceSep 30
30% chanceOct 4
40% chanceOct 7
50% chanceOct 10
60% chanceOct 13
70% chanceOct 16
80% chanceOct 19
90% chanceOct 24
Probability of moderate freeze (28°F) on or before...
10% chanceOct 5
20% chanceOct 11
30% chanceOct 16
40% chanceOct 19
50% chanceOct 22
60% chanceOct 25
70% chanceOct 28
80% chanceOct 31
90% chanceNov 5
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 17
20% chanceOct 24
30% chanceOct 27
40% chanceOct 31
50% chanceNov 2
60% chanceNov 5
70% chanceNov 8
80% chanceNov 12
90% chanceNov 18
Probability of hard freeze (20°F) on or before...
10% chanceOct 29
20% chanceNov 2
30% chanceNov 6
40% chanceNov 10
50% chanceNov 13
60% chanceNov 16
70% chanceNov 20
80% chanceNov 24
90% chanceNov 29
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 7
20% chanceNov 13
30% chanceNov 17
40% chanceNov 21
50% chanceNov 25
60% chanceNov 28
70% chanceDec 1
80% chanceDec 5
90% chanceDec 10

Agricultural climatic data from weather station: MONMOUTH 4NW (USC00115772)

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