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🍂 First Frost Dates for Chatsworth, Iowa 51011

The first 36°F frost date is 30% likely to be on Sep 17. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 25. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Chatsworth, IA 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 9
20% chanceSep 14
30% chanceSep 17
40% chanceSep 20
50% chanceSep 22
60% chanceSep 25
70% chanceSep 27
80% chanceSep 30
90% chanceOct 4
Probability of light freeze (32°F) on or before...
10% chanceSep 17
20% chanceSep 21
30% chanceSep 25
40% chanceSep 27
50% chanceSep 30
60% chanceOct 2
70% chanceOct 5
80% chanceOct 8
90% chanceOct 13
Probability of moderate freeze (28°F) on or before...
10% chanceSep 24
20% chanceSep 29
30% chanceOct 2
40% chanceOct 5
50% chanceOct 9
60% chanceOct 12
70% chanceOct 15
80% chanceOct 19
90% chanceOct 23
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 2
20% chanceOct 8
30% chanceOct 12
40% chanceOct 16
50% chanceOct 19
60% chanceOct 23
70% chanceOct 26
80% chanceOct 30
90% chanceNov 3
Probability of hard freeze (20°F) on or before...
10% chanceOct 11
20% chanceOct 17
30% chanceOct 22
40% chanceOct 26
50% chanceOct 29
60% chanceNov 1
70% chanceNov 4
80% chanceNov 8
90% chanceNov 13
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 20
20% chanceOct 28
30% chanceNov 1
40% chanceNov 3
50% chanceNov 6
60% chanceNov 10
70% chanceNov 14
80% chanceNov 18
90% chanceNov 24

Agricultural climatic data from weather station: HAWARDEN (USC00133718)

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