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🍂 First Frost Dates for Island Lake, Illinois 60042

The first 36°F frost date is 30% likely to be on Sep 26. (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 Island Lake, 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 23
30% chanceSep 26
40% chanceSep 28
50% chanceOct 1
60% chanceOct 2
70% chanceOct 5
80% chanceOct 7
90% chanceOct 11
Probability of light freeze (32°F) on or before...
10% chanceSep 28
20% chanceOct 1
30% chanceOct 4
40% chanceOct 6
50% chanceOct 9
60% chanceOct 11
70% chanceOct 14
80% chanceOct 17
90% chanceOct 22
Probability of moderate freeze (28°F) on or before...
10% chanceOct 6
20% chanceOct 11
30% chanceOct 14
40% chanceOct 17
50% chanceOct 20
60% chanceOct 23
70% chanceOct 26
80% chanceOct 29
90% chanceNov 3
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 15
20% chanceOct 21
30% chanceOct 25
40% chanceOct 29
50% chanceOct 31
60% chanceNov 3
70% chanceNov 7
80% chanceNov 11
90% chanceNov 16
Probability of hard freeze (20°F) on or before...
10% chanceOct 28
20% chanceNov 1
30% chanceNov 6
40% chanceNov 10
50% chanceNov 13
60% chanceNov 17
70% chanceNov 20
80% chanceNov 24
90% chanceNov 28
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 9
20% chanceNov 15
30% chanceNov 19
40% chanceNov 23
50% chanceNov 26
60% chanceNov 28
70% chanceDec 1
80% chanceDec 4
90% chanceDec 10

Agricultural climatic data from weather station: MCHENRY-WG STRATTON LD (USC00115493)

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