🌷 Your Ultimate Garden Calendar!

🍂 First Frost Dates for Powderville, Montana 59345

The first 36°F frost date is 30% likely to be on Sep 6. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 14. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Powderville, 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% chanceAug 30
20% chanceSep 2
30% chanceSep 6
40% chanceSep 9
50% chanceSep 11
60% chanceSep 14
70% chanceSep 16
80% chanceSep 19
90% chanceSep 24
Probability of light freeze (32°F) on or before...
10% chanceSep 4
20% chanceSep 10
30% chanceSep 14
40% chanceSep 17
50% chanceSep 20
60% chanceSep 23
70% chanceSep 25
80% chanceSep 29
90% chanceOct 3
Probability of moderate freeze (28°F) on or before...
10% chanceSep 10
20% chanceSep 18
30% chanceSep 23
40% chanceSep 26
50% chanceSep 29
60% chanceOct 1
70% chanceOct 4
80% chanceOct 7
90% chanceOct 13
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 22
20% chanceSep 28
30% chanceOct 2
40% chanceOct 5
50% chanceOct 8
60% chanceOct 11
70% chanceOct 15
80% chanceOct 19
90% chanceOct 23
Probability of hard freeze (20°F) on or before...
10% chanceOct 2
20% chanceOct 6
30% chanceOct 11
40% chanceOct 15
50% chanceOct 18
60% chanceOct 21
70% chanceOct 24
80% chanceOct 28
90% chanceNov 2
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 8
20% chanceOct 15
30% chanceOct 19
40% chanceOct 23
50% chanceOct 26
60% chanceOct 30
70% chanceNov 2
80% chanceNov 6
90% chanceNov 11

Agricultural climatic data from weather station: POWDERVILLE 8 NNE (USC00246691)

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