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🍂 First Frost Dates for Ingomar, Montana 59039

The first 36°F frost date is 30% likely to be on Sep 10. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 18. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Ingomar, 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 2
20% chanceSep 6
30% chanceSep 10
40% chanceSep 12
50% chanceSep 14
60% chanceSep 16
70% chanceSep 19
80% chanceSep 22
90% chanceSep 26
Probability of light freeze (32°F) on or before...
10% chanceSep 11
20% chanceSep 15
30% chanceSep 18
40% chanceSep 20
50% chanceSep 23
60% chanceSep 25
70% chanceSep 27
80% chanceSep 30
90% chanceOct 4
Probability of moderate freeze (28°F) on or before...
10% chanceSep 18
20% chanceSep 23
30% chanceSep 25
40% chanceSep 28
50% chanceOct 1
60% chanceOct 3
70% chanceOct 5
80% chanceOct 8
90% chanceOct 13
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 25
20% chanceSep 30
30% chanceOct 3
40% chanceOct 5
50% chanceOct 9
60% chanceOct 12
70% chanceOct 15
80% chanceOct 18
90% chanceOct 23
Probability of hard freeze (20°F) on or before...
10% chanceOct 2
20% chanceOct 7
30% chanceOct 11
40% chanceOct 15
50% chanceOct 18
60% chanceOct 21
70% chanceOct 24
80% chanceOct 28
90% chanceNov 1
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 10
20% chanceOct 16
30% chanceOct 21
40% chanceOct 24
50% chanceOct 27
60% chanceOct 30
70% chanceNov 2
80% chanceNov 6
90% chanceNov 12

Agricultural climatic data from weather station: INGOMAR 14 NE (USC00244386)

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