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🍂 First Frost Dates for Mosinee, Wisconsin 54455

The first 36°F frost date is 30% likely to be on Sep 19. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 28. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Mosinee, 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 12
20% chanceSep 16
30% chanceSep 19
40% chanceSep 22
50% chanceSep 24
60% chanceSep 26
70% chanceSep 28
80% chanceOct 1
90% chanceOct 4
Probability of light freeze (32°F) on or before...
10% chanceSep 20
20% chanceSep 25
30% chanceSep 28
40% chanceSep 30
50% chanceOct 2
60% chanceOct 4
70% chanceOct 7
80% chanceOct 10
90% chanceOct 15
Probability of moderate freeze (28°F) on or before...
10% chanceSep 30
20% chanceOct 4
30% chanceOct 7
40% chanceOct 10
50% chanceOct 13
60% chanceOct 16
70% chanceOct 20
80% chanceOct 24
90% chanceOct 30
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 11
20% chanceOct 16
30% chanceOct 20
40% chanceOct 23
50% chanceOct 27
60% chanceOct 30
70% chanceNov 1
80% chanceNov 5
90% chanceNov 10
Probability of hard freeze (20°F) on or before...
10% chanceOct 22
20% chanceOct 28
30% chanceNov 1
40% chanceNov 3
50% chanceNov 6
60% chanceNov 9
70% chanceNov 12
80% chanceNov 16
90% chanceNov 20
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 1
20% chanceNov 6
30% chanceNov 10
40% chanceNov 13
50% chanceNov 16
60% chanceNov 19
70% chanceNov 21
80% chanceNov 24
90% chanceNov 28

Agricultural climatic data from weather station: WAUSAU DWTN AP (USW00014897)

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