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🍂 First Frost Dates for Willard, Montana 59354

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 Willard, 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 16
70% chanceSep 19
80% chanceSep 21
90% chanceSep 25
Probability of light freeze (32°F) on or before...
10% chanceSep 9
20% chanceSep 14
30% chanceSep 17
40% chanceSep 20
50% chanceSep 22
60% chanceSep 24
70% chanceSep 27
80% chanceSep 30
90% chanceOct 4
Probability of moderate freeze (28°F) on or before...
10% chanceSep 17
20% chanceSep 22
30% chanceSep 25
40% chanceSep 28
50% chanceSep 30
60% chanceOct 3
70% chanceOct 5
80% chanceOct 8
90% chanceOct 13
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 24
20% chanceSep 29
30% chanceOct 3
40% chanceOct 6
50% chanceOct 9
60% chanceOct 12
70% chanceOct 15
80% chanceOct 18
90% chanceOct 22
Probability of hard freeze (20°F) on or before...
10% chanceOct 2
20% chanceOct 8
30% chanceOct 12
40% chanceOct 15
50% chanceOct 18
60% chanceOct 21
70% chanceOct 23
80% chanceOct 27
90% chanceOct 31
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 11
20% chanceOct 16
30% chanceOct 20
40% chanceOct 23
50% chanceOct 26
60% chanceOct 29
70% chanceNov 1
80% chanceNov 5
90% chanceNov 12

Agricultural climatic data from weather station: BAKER MUNI AP (USW00094055)

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