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🍂 First Frost Dates for Fox River Grove, Illinois 60021

The first 36°F frost date is 30% likely to be on Sep 28. (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 Fox River Grove, 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 25
30% chanceSep 28
40% chanceOct 1
50% chanceOct 3
60% chanceOct 5
70% chanceOct 8
80% chanceOct 12
90% chanceOct 16
Probability of light freeze (32°F) on or before...
10% chanceSep 29
20% chanceOct 3
30% chanceOct 6
40% chanceOct 9
50% chanceOct 13
60% chanceOct 16
70% chanceOct 19
80% chanceOct 23
90% chanceOct 26
Probability of moderate freeze (28°F) on or before...
10% chanceOct 7
20% chanceOct 13
30% chanceOct 18
40% chanceOct 21
50% chanceOct 24
60% chanceOct 27
70% chanceOct 31
80% chanceNov 2
90% chanceNov 8
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 18
20% chanceOct 24
30% chanceOct 29
40% chanceNov 1
50% chanceNov 4
60% chanceNov 7
70% chanceNov 11
80% chanceNov 15
90% chanceNov 20
Probability of hard freeze (20°F) on or before...
10% chanceOct 29
20% chanceNov 3
30% chanceNov 7
40% chanceNov 12
50% chanceNov 15
60% chanceNov 18
70% chanceNov 22
80% chanceNov 26
90% chanceDec 1
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 7
20% chanceNov 14
30% chanceNov 19
40% chanceNov 23
50% chanceNov 26
60% chanceNov 29
70% chanceDec 2
80% chanceDec 6
90% chanceDec 12

Agricultural climatic data from weather station: BARRINGTON 3SW (USC00110442)

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