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🍂 First Frost Dates for Saint Xavier, Montana 59075

The first 36°F frost date is 30% likely to be on Sep 14. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 23. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Saint Xavier, 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 10
30% chanceSep 14
40% chanceSep 17
50% chanceSep 20
60% chanceSep 23
70% chanceSep 26
80% chanceSep 29
90% chanceOct 3
Probability of light freeze (32°F) on or before...
10% chanceSep 14
20% chanceSep 19
30% chanceSep 23
40% chanceSep 27
50% chanceSep 30
60% chanceOct 2
70% chanceOct 5
80% chanceOct 8
90% chanceOct 14
Probability of moderate freeze (28°F) on or before...
10% chanceSep 23
20% chanceSep 28
30% chanceOct 2
40% chanceOct 5
50% chanceOct 8
60% chanceOct 12
70% chanceOct 16
80% chanceOct 20
90% chanceOct 27
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 1
20% chanceOct 7
30% chanceOct 12
40% chanceOct 16
50% chanceOct 20
60% chanceOct 24
70% chanceOct 28
80% chanceNov 1
90% chanceNov 8
Probability of hard freeze (20°F) on or before...
10% chanceOct 12
20% chanceOct 19
30% chanceOct 24
40% chanceOct 29
50% chanceNov 1
60% chanceNov 4
70% chanceNov 9
80% chanceNov 13
90% chanceNov 20
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 23
20% chanceOct 30
30% chanceNov 2
40% chanceNov 7
50% chanceNov 10
60% chanceNov 14
70% chanceNov 18
80% chanceNov 23
90% chanceNov 29

Agricultural climatic data from weather station: YELLOWTAIL DAM (USC00249240)

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