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🍂 First Frost Dates for Helena, Missouri 64459

The first 36°F frost date is 30% likely to be on Sep 28. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 9. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Helena, 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% chanceSep 19
20% chanceSep 25
30% chanceSep 28
40% chanceOct 1
50% chanceOct 5
60% chanceOct 8
70% chanceOct 11
80% chanceOct 15
90% chanceOct 20
Probability of light freeze (32°F) on or before...
10% chanceSep 29
20% chanceOct 4
30% chanceOct 9
40% chanceOct 13
50% chanceOct 16
60% chanceOct 20
70% chanceOct 23
80% chanceOct 27
90% chanceOct 31
Probability of moderate freeze (28°F) on or before...
10% chanceOct 9
20% chanceOct 16
30% chanceOct 21
40% chanceOct 24
50% chanceOct 28
60% chanceNov 1
70% chanceNov 3
80% chanceNov 6
90% chanceNov 11
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 21
20% chanceOct 28
30% chanceNov 1
40% chanceNov 4
50% chanceNov 7
60% chanceNov 10
70% chanceNov 14
80% chanceNov 17
90% chanceNov 23
Probability of hard freeze (20°F) on or before...
10% chanceNov 2
20% chanceNov 6
30% chanceNov 10
40% chanceNov 14
50% chanceNov 17
60% chanceNov 21
70% chanceNov 25
80% chanceNov 29
90% chanceDec 4
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 9
20% chanceNov 15
30% chanceNov 19
40% chanceNov 24
50% chanceNov 27
60% chanceDec 1
70% chanceDec 3
80% chanceDec 7
90% chanceDec 13

Agricultural climatic data from weather station: AMITY 4 NE (USC00230143)

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