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🍂 First Frost Dates for Lakeside, Montana 59922

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 14. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Lakeside, 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 5
20% chanceSep 10
30% chanceSep 14
40% chanceSep 17
50% chanceSep 20
60% chanceSep 22
70% chanceSep 26
80% chanceSep 29
90% chanceOct 3
Probability of moderate freeze (28°F) on or before...
10% chanceSep 18
20% chanceSep 23
30% chanceSep 26
40% chanceSep 29
50% chanceOct 1
60% chanceOct 3
70% chanceOct 6
80% chanceOct 10
90% chanceOct 15
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 28
20% chanceOct 1
30% chanceOct 5
40% chanceOct 8
50% chanceOct 13
60% chanceOct 17
70% chanceOct 20
80% chanceOct 24
90% chanceOct 29
Probability of hard freeze (20°F) on or before...
10% chanceOct 6
20% chanceOct 15
30% chanceOct 21
40% chanceOct 25
50% chanceOct 29
60% chanceNov 1
70% chanceNov 5
80% chanceNov 10
90% chanceNov 18
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 20
20% chanceOct 28
30% chanceNov 1
40% chanceNov 5
50% chanceNov 10
60% chanceNov 15
70% chanceNov 20
80% chanceNov 25
90% chanceDec 1

Agricultural climatic data from weather station: CRESTON (USC00242104)

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