🌷 Your Ultimate Garden Calendar!

🍂 First Frost Dates for Brownstown, Illinois 62418

The first 36°F frost date is 30% likely to be on Oct 3. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 13. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

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

Agricultural climatic data from weather station: BROWNSTOWN 4 SW (USC00111020)

Back to Weather Calendar