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🍂 First Frost Dates for Delta, Iowa 52550

The first 36°F frost date is 30% likely to be on Sep 26. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 5. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Delta, 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 19
20% chanceSep 23
30% chanceSep 26
40% chanceSep 29
50% chanceOct 1
60% chanceOct 4
70% chanceOct 7
80% chanceOct 11
90% chanceOct 16
Probability of light freeze (32°F) on or before...
10% chanceSep 27
20% chanceOct 1
30% chanceOct 5
40% chanceOct 9
50% chanceOct 12
60% chanceOct 16
70% chanceOct 19
80% chanceOct 23
90% chanceOct 27
Probability of moderate freeze (28°F) on or before...
10% chanceOct 5
20% chanceOct 13
30% chanceOct 17
40% chanceOct 21
50% chanceOct 24
60% chanceOct 27
70% chanceOct 30
80% chanceNov 1
90% chanceNov 6
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 17
20% chanceOct 24
30% chanceOct 28
40% chanceOct 31
50% chanceNov 2
60% chanceNov 5
70% chanceNov 8
80% chanceNov 13
90% chanceNov 18
Probability of hard freeze (20°F) on or before...
10% chanceOct 29
20% chanceNov 2
30% chanceNov 6
40% chanceNov 9
50% chanceNov 12
60% chanceNov 16
70% chanceNov 19
80% chanceNov 24
90% chanceNov 30
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 6
20% chanceNov 11
30% chanceNov 16
40% chanceNov 19
50% chanceNov 24
60% chanceNov 27
70% chanceDec 1
80% chanceDec 4
90% chanceDec 9

Agricultural climatic data from weather station: SIGOURNEY (USC00137678)

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