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🍂 First Frost Dates for Lavina, Montana 59046

A 36°F frost is always a risk here. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 11. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Lavina, 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% chancealways
20% chancealways
30% chancealways
40% chancealways
50% chancealways
60% chancealways
70% chancealways
80% chancealways
90% chancealways
Probability of light freeze (32°F) on or before...
10% chanceSep 2
20% chanceSep 8
30% chanceSep 11
40% chanceSep 14
50% chanceSep 16
60% chanceSep 19
70% chanceSep 21
80% chanceSep 24
90% chanceSep 29
Probability of moderate freeze (28°F) on or before...
10% chanceSep 13
20% chanceSep 17
30% chanceSep 21
40% chanceSep 23
50% chanceSep 26
60% chanceSep 28
70% chanceOct 1
80% chanceOct 3
90% chanceOct 8
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 20
20% chanceSep 25
30% chanceSep 28
40% chanceOct 1
50% chanceOct 3
60% chanceOct 6
70% chanceOct 9
80% chanceOct 13
90% chanceOct 18
Probability of hard freeze (20°F) on or before...
10% chanceSep 27
20% chanceOct 1
30% chanceOct 5
40% chanceOct 8
50% chanceOct 12
60% chanceOct 16
70% chanceOct 19
80% chanceOct 23
90% chanceOct 29
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 3
20% chanceOct 8
30% chanceOct 14
40% chanceOct 18
50% chanceOct 21
60% chanceOct 25
70% chanceOct 28
80% chanceNov 1
90% chanceNov 7

Agricultural climatic data from weather station: RYEGATE 18 NNW (USC00247263)

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