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🍂 First Frost Dates for Biddle, Montana 59314

The first 36°F frost date is 30% likely to be on Sep 13. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 21. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

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

Agricultural climatic data from weather station: BIDDLE 8 SW (USC00240743)

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