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🍂 First Frost Dates for Greenville, Iowa 51343

The first 36°F frost date is 30% likely to be on Sep 18. (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 Greenville, 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 11
20% chanceSep 15
30% chanceSep 18
40% chanceSep 20
50% chanceSep 22
60% chanceSep 24
70% chanceSep 27
80% chanceSep 29
90% chanceOct 4
Probability of light freeze (32°F) on or before...
10% chanceSep 18
20% chanceSep 22
30% chanceSep 25
40% chanceSep 28
50% chanceSep 30
60% chanceOct 2
70% chanceOct 5
80% chanceOct 9
90% chanceOct 13
Probability of moderate freeze (28°F) on or before...
10% chanceSep 26
20% chanceSep 30
30% chanceOct 4
40% chanceOct 7
50% chanceOct 10
60% chanceOct 13
70% chanceOct 16
80% chanceOct 20
90% chanceOct 25
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 6
20% chanceOct 11
30% chanceOct 15
40% chanceOct 18
50% chanceOct 21
60% chanceOct 24
70% chanceOct 27
80% chanceOct 30
90% chanceNov 4
Probability of hard freeze (20°F) on or before...
10% chanceOct 16
20% chanceOct 21
30% chanceOct 25
40% chanceOct 28
50% chanceOct 31
60% chanceNov 2
70% chanceNov 5
80% chanceNov 8
90% chanceNov 13
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 26
20% chanceOct 31
30% chanceNov 2
40% chanceNov 5
50% chanceNov 8
60% chanceNov 11
70% chanceNov 14
80% chanceNov 17
90% chanceNov 23

Agricultural climatic data from weather station: SPENCER 1 N (USC00137844)

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