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🍂 First Frost Dates for Charles City, Iowa 50616

The first 36°F frost date is 30% likely to be on Sep 21. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 28. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Charles City, 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 14
20% chanceSep 18
30% chanceSep 21
40% chanceSep 23
50% chanceSep 25
60% chanceSep 27
70% chanceSep 29
80% chanceOct 2
90% chanceOct 6
Probability of light freeze (32°F) on or before...
10% chanceSep 20
20% chanceSep 25
30% chanceSep 28
40% chanceSep 30
50% chanceOct 3
60% chanceOct 5
70% chanceOct 8
80% chanceOct 11
90% chanceOct 15
Probability of moderate freeze (28°F) on or before...
10% chanceSep 30
20% chanceOct 4
30% chanceOct 7
40% chanceOct 10
50% chanceOct 14
60% chanceOct 16
70% chanceOct 19
80% chanceOct 23
90% chanceOct 27
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 9
20% chanceOct 15
30% chanceOct 19
40% chanceOct 22
50% chanceOct 25
60% chanceOct 28
70% chanceOct 30
80% chanceNov 2
90% chanceNov 7
Probability of hard freeze (20°F) on or before...
10% chanceOct 20
20% chanceOct 26
30% chanceOct 30
40% chanceNov 1
50% chanceNov 3
60% chanceNov 6
70% chanceNov 10
80% chanceNov 13
90% chanceNov 18
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 1
20% chanceNov 4
30% chanceNov 7
40% chanceNov 10
50% chanceNov 13
60% chanceNov 17
70% chanceNov 20
80% chanceNov 24
90% chanceNov 29

Agricultural climatic data from weather station: CHARLES CITY (USC00131402)

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