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🍂 First Frost Dates for Post Falls, Idaho 83854

The first 36°F frost date is 30% likely to be on Sep 29. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 8. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Post Falls, 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 22
20% chanceSep 26
30% chanceSep 29
40% chanceOct 1
50% chanceOct 3
60% chanceOct 5
70% chanceOct 8
80% chanceOct 12
90% chanceOct 17
Probability of light freeze (32°F) on or before...
10% chanceOct 1
20% chanceOct 5
30% chanceOct 8
40% chanceOct 12
50% chanceOct 16
60% chanceOct 19
70% chanceOct 21
80% chanceOct 25
90% chanceOct 30
Probability of moderate freeze (28°F) on or before...
10% chanceOct 13
20% chanceOct 19
30% chanceOct 23
40% chanceOct 27
50% chanceOct 30
60% chanceNov 2
70% chanceNov 6
80% chanceNov 11
90% chanceNov 18
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 24
20% chanceOct 31
30% chanceNov 4
40% chanceNov 9
50% chanceNov 13
60% chanceNov 18
70% chanceNov 23
80% chanceNov 29
90% chanceDec 5
Probability of hard freeze (20°F) on or before...
10% chanceNov 3
20% chanceNov 11
30% chanceNov 18
40% chanceNov 24
50% chanceNov 29
60% chanceDec 3
70% chanceDec 7
80% chanceDec 13
90% chanceDec 21
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 16
20% chanceNov 26
30% chanceDec 1
40% chanceDec 6
50% chanceDec 11
60% chanceDec 17
70% chanceDec 23
80% chanceDec 29
90% chanceJan 8

Agricultural climatic data from weather station: COEUR D'ALENE (USC00101956)

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