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🍂 First Frost Dates for Saint Louis, Missouri 63130

The first 36°F frost date is 30% likely to be on Oct 20. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 31. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Saint Louis, MO 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% chanceOct 11
20% chanceOct 16
30% chanceOct 20
40% chanceOct 23
50% chanceOct 25
60% chanceOct 28
70% chanceOct 31
80% chanceNov 3
90% chanceNov 8
Probability of light freeze (32°F) on or before...
10% chanceOct 22
20% chanceOct 27
30% chanceOct 31
40% chanceNov 2
50% chanceNov 5
60% chanceNov 8
70% chanceNov 12
80% chanceNov 16
90% chanceNov 23
Probability of moderate freeze (28°F) on or before...
10% chanceNov 2
20% chanceNov 6
30% chanceNov 10
40% chanceNov 14
50% chanceNov 17
60% chanceNov 21
70% chanceNov 26
80% chanceNov 30
90% chanceDec 5
Probability of moderate hard freeze (24°F) on or before...
10% chanceNov 9
20% chanceNov 16
30% chanceNov 21
40% chanceNov 26
50% chanceNov 29
60% chanceDec 2
70% chanceDec 5
80% chanceDec 10
90% chanceDec 16
Probability of hard freeze (20°F) on or before...
10% chanceNov 20
20% chanceNov 27
30% chanceDec 1
40% chanceDec 4
50% chanceDec 8
60% chanceDec 11
70% chanceDec 15
80% chanceDec 20
90% chanceDec 25
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 30
20% chanceDec 5
30% chanceDec 9
40% chanceDec 12
50% chanceDec 16
60% chanceDec 21
70% chanceDec 25
80% chanceDec 29
90% chanceJan 5

Agricultural climatic data from weather station: ST LOUIS SCI CTR (USC00237452)

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