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🍂 First Frost Dates for Potosi, Wisconsin 53820

The first 36°F frost date is 30% likely to be on Sep 24. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 2. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Potosi, 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% chanceSep 18
20% chanceSep 22
30% chanceSep 24
40% chanceSep 26
50% chanceSep 29
60% chanceOct 1
70% chanceOct 3
80% chanceOct 6
90% chanceOct 10
Probability of light freeze (32°F) on or before...
10% chanceSep 25
20% chanceSep 29
30% chanceOct 2
40% chanceOct 5
50% chanceOct 7
60% chanceOct 10
70% chanceOct 13
80% chanceOct 16
90% chanceOct 21
Probability of moderate freeze (28°F) on or before...
10% chanceOct 4
20% chanceOct 9
30% chanceOct 13
40% chanceOct 16
50% chanceOct 19
60% chanceOct 22
70% chanceOct 24
80% chanceOct 27
90% chanceNov 1
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 14
20% chanceOct 19
30% chanceOct 23
40% chanceOct 27
50% chanceOct 29
60% chanceNov 1
70% chanceNov 3
80% chanceNov 7
90% chanceNov 13
Probability of hard freeze (20°F) on or before...
10% chanceOct 24
20% chanceOct 30
30% chanceNov 2
40% chanceNov 5
50% chanceNov 8
60% chanceNov 12
70% chanceNov 15
80% chanceNov 19
90% chanceNov 24
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 3
20% chanceNov 8
30% chanceNov 12
40% chanceNov 15
50% chanceNov 19
60% chanceNov 22
70% chanceNov 25
80% chanceNov 29
90% chanceDec 3

Agricultural climatic data from weather station: LANCASTER 4 WSW (USC00474546)

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