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🍂 First Frost Dates for Mountain, Wisconsin 54149

A 36°F frost is always a risk here. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 19. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Mountain, 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% chancealways
20% chancealways
30% chancealways
40% chancealways
50% chancealways
60% chancealways
70% chancealways
80% chancealways
90% chancealways
Probability of light freeze (32°F) on or before...
10% chanceSep 11
20% chanceSep 16
30% chanceSep 19
40% chanceSep 22
50% chanceSep 25
60% chanceSep 27
70% chanceSep 30
80% chanceOct 2
90% chanceOct 6
Probability of moderate freeze (28°F) on or before...
10% chanceSep 23
20% chanceSep 27
30% chanceSep 30
40% chanceOct 2
50% chanceOct 5
60% chanceOct 7
70% chanceOct 10
80% chanceOct 14
90% chanceOct 20
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 3
20% chanceOct 8
30% chanceOct 11
40% chanceOct 15
50% chanceOct 18
60% chanceOct 21
70% chanceOct 26
80% chanceOct 30
90% chanceNov 3
Probability of hard freeze (20°F) on or before...
10% chanceOct 16
20% chanceOct 21
30% chanceOct 25
40% chanceOct 29
50% chanceNov 1
60% chanceNov 3
70% chanceNov 6
80% chanceNov 10
90% chanceNov 15
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 29
20% chanceNov 2
30% chanceNov 5
40% chanceNov 8
50% chanceNov 11
60% chanceNov 14
70% chanceNov 17
80% chanceNov 20
90% chanceNov 25

Agricultural climatic data from weather station: LAKEWOOD 3 NE (USC00474523)

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