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🍂 First Frost Dates for Hinsdale, Montana 59241

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 25. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Hinsdale, 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 23
60% chanceSep 25
70% chanceSep 28
80% chanceOct 1
90% chanceOct 4
Probability of light freeze (32°F) on or before...
10% chanceSep 17
20% chanceSep 21
30% chanceSep 25
40% chanceSep 28
50% chanceOct 1
60% chanceOct 3
70% chanceOct 5
80% chanceOct 9
90% chanceOct 14
Probability of moderate freeze (28°F) on or before...
10% chanceSep 25
20% chanceSep 30
30% chanceOct 3
40% chanceOct 7
50% chanceOct 10
60% chanceOct 13
70% chanceOct 17
80% chanceOct 20
90% chanceOct 25
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 3
20% chanceOct 9
30% chanceOct 13
40% chanceOct 17
50% chanceOct 20
60% chanceOct 23
70% chanceOct 26
80% chanceOct 29
90% chanceNov 3
Probability of hard freeze (20°F) on or before...
10% chanceOct 13
20% chanceOct 18
30% chanceOct 23
40% chanceOct 26
50% chanceOct 29
60% chanceNov 1
70% chanceNov 5
80% chanceNov 9
90% chanceNov 15
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 20
20% chanceOct 26
30% chanceOct 30
40% chanceNov 2
50% chanceNov 6
60% chanceNov 10
70% chanceNov 13
80% chanceNov 18
90% chanceNov 24

Agricultural climatic data from weather station: HINSDALE 4 SW (USC00244180)

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