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🍂 First Frost Dates for Cottonwood, Idaho 83522

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 29. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Cottonwood, ID 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 19
20% chanceSep 25
30% chanceSep 29
40% chanceOct 2
50% chanceOct 6
60% chanceOct 9
70% chanceOct 13
80% chanceOct 17
90% chanceOct 23
Probability of moderate freeze (28°F) on or before...
10% chanceOct 1
20% chanceOct 8
30% chanceOct 13
40% chanceOct 17
50% chanceOct 20
60% chanceOct 24
70% chanceOct 28
80% chanceNov 1
90% chanceNov 7
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 16
20% chanceOct 22
30% chanceOct 26
40% chanceOct 30
50% chanceNov 3
60% chanceNov 6
70% chanceNov 11
80% chanceNov 16
90% chanceNov 22
Probability of hard freeze (20°F) on or before...
10% chanceOct 25
20% chanceNov 1
30% chanceNov 7
40% chanceNov 12
50% chanceNov 17
60% chanceNov 21
70% chanceNov 25
80% chanceNov 29
90% chanceDec 4
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 4
20% chanceNov 13
30% chanceNov 20
40% chanceNov 25
50% chanceNov 29
60% chanceDec 3
70% chanceDec 8
80% chanceDec 13
90% chanceDec 21

Agricultural climatic data from weather station: COTTONWOOD 2 WSW (USC00102159)

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