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🍂 First Frost Dates for Smithland, Iowa 51056

The first 36°F frost date is 30% likely to be on Sep 16. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 23. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Smithland, 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 8
20% chanceSep 12
30% chanceSep 16
40% chanceSep 18
50% chanceSep 20
60% chanceSep 23
70% chanceSep 25
80% chanceSep 28
90% chanceOct 2
Probability of light freeze (32°F) on or before...
10% chanceSep 16
20% chanceSep 20
30% chanceSep 23
40% chanceSep 26
50% chanceSep 28
60% chanceSep 30
70% chanceOct 3
80% chanceOct 6
90% chanceOct 11
Probability of moderate freeze (28°F) on or before...
10% chanceSep 24
20% chanceSep 28
30% chanceOct 1
40% chanceOct 4
50% chanceOct 7
60% chanceOct 10
70% chanceOct 13
80% chanceOct 18
90% chanceOct 22
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 2
20% chanceOct 7
30% chanceOct 11
40% chanceOct 15
50% chanceOct 18
60% chanceOct 21
70% chanceOct 24
80% chanceOct 28
90% chanceNov 1
Probability of hard freeze (20°F) on or before...
10% chanceOct 12
20% chanceOct 18
30% chanceOct 22
40% chanceOct 25
50% chanceOct 28
60% chanceOct 31
70% chanceNov 3
80% chanceNov 6
90% chanceNov 11
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 22
20% chanceOct 28
30% chanceNov 1
40% chanceNov 3
50% chanceNov 6
60% chanceNov 8
70% chanceNov 12
80% chanceNov 16
90% chanceNov 23

Agricultural climatic data from weather station: MAPLETON NO.2 (USC00135123)

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