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🍂 First Frost Dates for Woodstock, Illinois 60098

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 3. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Woodstock, 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 27
50% chanceSep 30
60% chanceOct 1
70% chanceOct 4
80% chanceOct 7
90% chanceOct 12
Probability of light freeze (32°F) on or before...
10% chanceSep 26
20% chanceSep 30
30% chanceOct 3
40% chanceOct 5
50% chanceOct 8
60% chanceOct 12
70% chanceOct 15
80% chanceOct 19
90% chanceOct 25
Probability of moderate freeze (28°F) on or before...
10% chanceOct 4
20% chanceOct 9
30% chanceOct 14
40% chanceOct 18
50% chanceOct 21
60% chanceOct 24
70% chanceOct 28
80% chanceOct 31
90% chanceNov 4
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 15
20% chanceOct 21
30% chanceOct 25
40% chanceOct 29
50% chanceNov 1
60% chanceNov 4
70% chanceNov 7
80% chanceNov 11
90% chanceNov 17
Probability of hard freeze (20°F) on or before...
10% chanceOct 26
20% chanceNov 1
30% chanceNov 5
40% chanceNov 9
50% chanceNov 12
60% chanceNov 16
70% chanceNov 20
80% chanceNov 23
90% chanceNov 28
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 6
20% chanceNov 13
30% chanceNov 17
40% chanceNov 21
50% chanceNov 23
60% chanceNov 26
70% chanceNov 29
80% chanceDec 2
90% chanceDec 8

Agricultural climatic data from weather station: MARENGO (USC00115326)

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