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🍂 First Frost Dates for Cassopolis, Michigan 49031

The first 36°F frost date is 30% likely to be on Sep 23. (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 Cassopolis, MI 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 15
20% chanceSep 20
30% chanceSep 23
40% chanceSep 25
50% chanceSep 27
60% chanceSep 30
70% chanceOct 2
80% chanceOct 5
90% chanceOct 9
Probability of light freeze (32°F) on or before...
10% chanceSep 26
20% chanceSep 30
30% chanceOct 2
40% chanceOct 4
50% chanceOct 7
60% chanceOct 10
70% chanceOct 14
80% chanceOct 17
90% chanceOct 23
Probability of moderate freeze (28°F) on or before...
10% chanceOct 4
20% chanceOct 10
30% chanceOct 14
40% chanceOct 18
50% chanceOct 22
60% chanceOct 26
70% chanceOct 30
80% chanceNov 2
90% chanceNov 7
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 20
20% chanceOct 27
30% chanceOct 31
40% chanceNov 2
50% chanceNov 5
60% chanceNov 8
70% chanceNov 12
80% chanceNov 16
90% chanceNov 22
Probability of hard freeze (20°F) on or before...
10% chanceNov 1
20% chanceNov 7
30% chanceNov 12
40% chanceNov 16
50% chanceNov 20
60% chanceNov 24
70% chanceNov 28
80% chanceDec 1
90% chanceDec 7
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 14
20% chanceNov 21
30% chanceNov 27
40% chanceNov 30
50% chanceDec 3
60% chanceDec 6
70% chanceDec 10
80% chanceDec 14
90% chanceDec 19

Agricultural climatic data from weather station: DOWAGIAC 1 W (USC00202250)

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