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🍂 First Frost Dates for Redstone, Montana 59257

A 36°F frost is always a risk here. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 10. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Redstone, 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% chancealways
20% chancealways
30% chancealways
40% chancealways
50% chancealways
60% chancealways
70% chancealways
80% chancealways
90% chancealways
Probability of light freeze (32°F) on or before...
10% chanceSep 4
20% chanceSep 7
30% chanceSep 10
40% chanceSep 13
50% chanceSep 15
60% chanceSep 17
70% chanceSep 19
80% chanceSep 21
90% chanceSep 25
Probability of moderate freeze (28°F) on or before...
10% chanceSep 11
20% chanceSep 15
30% chanceSep 18
40% chanceSep 21
50% chanceSep 23
60% chanceSep 25
70% chanceSep 27
80% chanceSep 30
90% chanceOct 4
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 19
20% chanceSep 22
30% chanceSep 25
40% chanceSep 28
50% chanceSep 30
60% chanceOct 3
70% chanceOct 6
80% chanceOct 10
90% chanceOct 14
Probability of hard freeze (20°F) on or before...
10% chanceSep 25
20% chanceSep 29
30% chanceOct 3
40% chanceOct 7
50% chanceOct 10
60% chanceOct 13
70% chanceOct 16
80% chanceOct 19
90% chanceOct 24
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 4
20% chanceOct 9
30% chanceOct 13
40% chanceOct 17
50% chanceOct 20
60% chanceOct 22
70% chanceOct 26
80% chanceOct 29
90% chanceNov 3

Agricultural climatic data from weather station: PLENTYWOOD (USC00246586)

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