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🍂 First Frost Dates for Billings, Montana 59102

The first 36°F frost date is 30% likely to be on Sep 17. (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 Billings, MT 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 10
20% chanceSep 14
30% chanceSep 17
40% chanceSep 20
50% chanceSep 22
60% chanceSep 24
70% chanceSep 27
80% chanceSep 30
90% chanceOct 4
Probability of light freeze (32°F) on or before...
10% chanceSep 18
20% chanceSep 23
30% chanceSep 26
40% chanceSep 29
50% chanceOct 1
60% chanceOct 4
70% chanceOct 6
80% chanceOct 10
90% chanceOct 14
Probability of moderate freeze (28°F) on or before...
10% chanceSep 27
20% chanceOct 1
30% chanceOct 5
40% chanceOct 9
50% chanceOct 13
60% chanceOct 16
70% chanceOct 18
80% chanceOct 22
90% chanceOct 25
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 5
20% chanceOct 11
30% chanceOct 16
40% chanceOct 19
50% chanceOct 23
60% chanceOct 25
70% chanceOct 28
80% chanceOct 31
90% chanceNov 4
Probability of hard freeze (20°F) on or before...
10% chanceOct 18
20% chanceOct 23
30% chanceOct 27
40% chanceOct 30
50% chanceNov 2
60% chanceNov 5
70% chanceNov 8
80% chanceNov 12
90% chanceNov 17
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 27
20% chanceNov 1
30% chanceNov 4
40% chanceNov 7
50% chanceNov 10
60% chanceNov 13
70% chanceNov 16
80% chanceNov 20
90% chanceNov 25

Agricultural climatic data from weather station: BILLINGS WFO (USC00240801)

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