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🍂 First Frost Dates for Glendive, Montana 59330

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

The first 32°F light freeze date is 30% likely to be on Sep 27. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Glendive, 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 11
20% chanceSep 16
30% chanceSep 20
40% chanceSep 22
50% chanceSep 24
60% chanceSep 27
70% chanceSep 29
80% chanceOct 2
90% chanceOct 5
Probability of light freeze (32°F) on or before...
10% chanceSep 20
20% chanceSep 24
30% chanceSep 27
40% chanceSep 30
50% chanceOct 2
60% chanceOct 5
70% chanceOct 8
80% chanceOct 11
90% chanceOct 16
Probability of moderate freeze (28°F) on or before...
10% chanceSep 27
20% chanceOct 1
30% chanceOct 5
40% chanceOct 9
50% chanceOct 12
60% chanceOct 15
70% chanceOct 17
80% chanceOct 21
90% chanceOct 25
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 6
20% chanceOct 12
30% chanceOct 16
40% chanceOct 18
50% chanceOct 21
60% chanceOct 24
70% chanceOct 28
80% chanceOct 31
90% chanceNov 5
Probability of hard freeze (20°F) on or before...
10% chanceOct 15
20% chanceOct 20
30% chanceOct 24
40% chanceOct 28
50% chanceOct 31
60% chanceNov 3
70% chanceNov 6
80% chanceNov 11
90% chanceNov 16
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 24
20% chanceOct 30
30% chanceNov 2
40% chanceNov 6
50% chanceNov 9
60% chanceNov 13
70% chanceNov 17
80% chanceNov 20
90% chanceNov 25

Agricultural climatic data from weather station: GLENDIVE (USC00243581)

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