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🍂 First Frost Dates for Superior, Wisconsin 54880

The first 36°F frost date is 30% likely to be on Sep 16. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 26. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Superior, 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 8
20% chanceSep 13
30% chanceSep 16
40% chanceSep 19
50% chanceSep 21
60% chanceSep 23
70% chanceSep 26
80% chanceSep 28
90% chanceOct 2
Probability of light freeze (32°F) on or before...
10% chanceSep 20
20% chanceSep 23
30% chanceSep 26
40% chanceSep 29
50% chanceOct 1
60% chanceOct 3
70% chanceOct 5
80% chanceOct 8
90% chanceOct 13
Probability of moderate freeze (28°F) on or before...
10% chanceSep 30
20% chanceOct 3
30% chanceOct 6
40% chanceOct 9
50% chanceOct 12
60% chanceOct 15
70% chanceOct 18
80% chanceOct 22
90% chanceOct 27
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 11
20% chanceOct 15
30% chanceOct 18
40% chanceOct 22
50% chanceOct 26
60% chanceOct 29
70% chanceOct 31
80% chanceNov 3
90% chanceNov 8
Probability of hard freeze (20°F) on or before...
10% chanceOct 21
20% chanceOct 27
30% chanceOct 30
40% chanceNov 1
50% chanceNov 4
60% chanceNov 7
70% chanceNov 10
80% chanceNov 13
90% chanceNov 18
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 31
20% chanceNov 3
30% chanceNov 6
40% chanceNov 10
50% chanceNov 12
60% chanceNov 15
70% chanceNov 18
80% chanceNov 21
90% chanceNov 25

Agricultural climatic data from weather station: PATTISON RANGER STAION (USC00476413)

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