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🍂 First Frost Dates for Silverton, Idaho 83867

The first 36°F frost date is 30% likely to be on Sep 13. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 27. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Silverton, 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% chanceSep 5
20% chanceSep 9
30% chanceSep 13
40% chanceSep 16
50% chanceSep 19
60% chanceSep 22
70% chanceSep 25
80% chanceSep 28
90% chanceOct 2
Probability of light freeze (32°F) on or before...
10% chanceSep 18
20% chanceSep 23
30% chanceSep 27
40% chanceSep 30
50% chanceOct 2
60% chanceOct 4
70% chanceOct 7
80% chanceOct 11
90% chanceOct 16
Probability of moderate freeze (28°F) on or before...
10% chanceOct 1
20% chanceOct 5
30% chanceOct 9
40% chanceOct 14
50% chanceOct 18
60% chanceOct 21
70% chanceOct 25
80% chanceOct 30
90% chanceNov 5
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 14
20% chanceOct 21
30% chanceOct 27
40% chanceOct 31
50% chanceNov 3
60% chanceNov 8
70% chanceNov 13
80% chanceNov 19
90% chanceNov 25
Probability of hard freeze (20°F) on or before...
10% chanceOct 26
20% chanceNov 2
30% chanceNov 9
40% chanceNov 14
50% chanceNov 19
60% chanceNov 24
70% chanceNov 29
80% chanceDec 3
90% chanceDec 9
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 6
20% chanceNov 14
30% chanceNov 22
40% chanceNov 26
50% chanceDec 1
60% chanceDec 4
70% chanceDec 8
80% chanceDec 14
90% chanceDec 23

Agricultural climatic data from weather station: WALLACE (USC00109498)

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