🌷 Your Ultimate Garden Calendar!

🍂 First Frost Dates for Berwyn, Illinois 60402

The first 36°F frost date is 30% likely to be on Oct 12. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 22. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Berwyn, IL are based on historical climate data.

Always check your local forecast for the most up-to-date frost warnings.

Book Recommendations (ads!)

📚 Growing Under Cover: Techniques for a More Productive, Weather-Resistant, Pest-Free Vegetable Garden

📚 Greenhouse Gardening for Beginners: Step By Step Guide To Build A Year-Round Greenhouse And Grow Herbs, Organic Fruits And Vegetables, Plants, Flowers Plans & Ideas for Extending the Growing Season

📚 How to Garden Indoors & Grow Your Own Food Year Round: Ultimate Guide to Vertical, Container, and Hydroponic Gardening (Creative Homeowner) Vegetables, Herbs, DIY Projects, Composting, Lights, & More

📚 The Year-Round Vegetable Gardener: How to Grow Your Own Food 365 Days a Year, No Matter Where You Live

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% chanceOct 3
20% chanceOct 8
30% chanceOct 12
40% chanceOct 14
50% chanceOct 17
60% chanceOct 20
70% chanceOct 23
80% chanceOct 26
90% chanceOct 29
Probability of light freeze (32°F) on or before...
10% chanceOct 13
20% chanceOct 18
30% chanceOct 22
40% chanceOct 25
50% chanceOct 28
60% chanceOct 31
70% chanceNov 2
80% chanceNov 5
90% chanceNov 10
Probability of moderate freeze (28°F) on or before...
10% chanceOct 23
20% chanceOct 28
30% chanceNov 1
40% chanceNov 4
50% chanceNov 7
60% chanceNov 10
70% chanceNov 13
80% chanceNov 17
90% chanceNov 23
Probability of moderate hard freeze (24°F) on or before...
10% chanceNov 2
20% chanceNov 7
30% chanceNov 11
40% chanceNov 14
50% chanceNov 18
60% chanceNov 21
70% chanceNov 25
80% chanceNov 29
90% chanceDec 3
Probability of hard freeze (20°F) on or before...
10% chanceNov 10
20% chanceNov 17
30% chanceNov 21
40% chanceNov 25
50% chanceNov 28
60% chanceDec 1
70% chanceDec 4
80% chanceDec 8
90% chanceDec 14
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 21
20% chanceNov 26
30% chanceNov 30
40% chanceDec 2
50% chanceDec 5
60% chanceDec 9
70% chanceDec 13
80% chanceDec 17
90% chanceDec 22

Agricultural climatic data from weather station: CHICAGO MIDWAY AP (USW00014819)

Back to Weather Calendar