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🍂 First Frost Dates for Broadus, Montana 59317

The first 36°F frost date is 30% likely to be on Sep 9. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 17. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Broadus, 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 1
20% chanceSep 5
30% chanceSep 9
40% chanceSep 11
50% chanceSep 14
60% chanceSep 17
70% chanceSep 19
80% chanceSep 23
90% chanceSep 28
Probability of light freeze (32°F) on or before...
10% chanceSep 9
20% chanceSep 13
30% chanceSep 17
40% chanceSep 20
50% chanceSep 22
60% chanceSep 25
70% chanceSep 28
80% chanceOct 1
90% chanceOct 5
Probability of moderate freeze (28°F) on or before...
10% chanceSep 16
20% chanceSep 21
30% chanceSep 25
40% chanceSep 28
50% chanceOct 1
60% chanceOct 3
70% chanceOct 6
80% chanceOct 10
90% chanceOct 16
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 23
20% chanceSep 29
30% chanceOct 3
40% chanceOct 6
50% chanceOct 9
60% chanceOct 14
70% chanceOct 17
80% chanceOct 21
90% chanceOct 27
Probability of hard freeze (20°F) on or before...
10% chanceOct 2
20% chanceOct 8
30% chanceOct 13
40% chanceOct 17
50% chanceOct 21
60% chanceOct 24
70% chanceOct 27
80% chanceOct 31
90% chanceNov 5
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 11
20% chanceOct 18
30% chanceOct 23
40% chanceOct 27
50% chanceOct 30
60% chanceNov 2
70% chanceNov 5
80% chanceNov 10
90% chanceNov 16

Agricultural climatic data from weather station: BROADUS (USC00241127)

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