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🍂 First Frost Dates for Iola, Wisconsin 54945

The first 36°F frost date is 30% likely to be on Sep 5. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 17. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Iola, WI 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% chanceAug 24
20% chanceSep 1
30% chanceSep 5
40% chanceSep 9
50% chanceSep 12
60% chanceSep 15
70% chanceSep 19
80% chanceSep 22
90% chanceSep 26
Probability of light freeze (32°F) on or before...
10% chanceSep 4
20% chanceSep 12
30% chanceSep 17
40% chanceSep 20
50% chanceSep 23
60% chanceSep 26
70% chanceSep 28
80% chanceOct 1
90% chanceOct 5
Probability of moderate freeze (28°F) on or before...
10% chanceSep 19
20% chanceSep 24
30% chanceSep 27
40% chanceOct 1
50% chanceOct 2
60% chanceOct 5
70% chanceOct 7
80% chanceOct 11
90% chanceOct 17
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 29
20% chanceOct 3
30% chanceOct 7
40% chanceOct 10
50% chanceOct 13
60% chanceOct 17
70% chanceOct 21
80% chanceOct 26
90% chanceNov 1
Probability of hard freeze (20°F) on or before...
10% chanceOct 10
20% chanceOct 16
30% chanceOct 20
40% chanceOct 24
50% chanceOct 28
60% chanceOct 31
70% chanceNov 3
80% chanceNov 6
90% chanceNov 12
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 21
20% chanceOct 28
30% chanceNov 1
40% chanceNov 4
50% chanceNov 6
60% chanceNov 10
70% chanceNov 14
80% chanceNov 18
90% chanceNov 22

Agricultural climatic data from weather station: ROSHOLT 9 NNE (USC00477349)

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