🌷 Your Ultimate Garden Calendar!

🍂 First Frost Dates for Thurman, Iowa 51654

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

The first 32°F light freeze date is 30% likely to be on Oct 10. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

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

Agricultural climatic data from weather station: SIDNEY (USC00137669)

Back to Weather Calendar