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🍂 First Frost Dates for Meridian, Idaho 83642

The first 36°F frost date is 30% likely to be on Sep 27. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 7. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Meridian, 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 17
20% chanceSep 23
30% chanceSep 27
40% chanceSep 30
50% chanceOct 2
60% chanceOct 5
70% chanceOct 8
80% chanceOct 12
90% chanceOct 17
Probability of light freeze (32°F) on or before...
10% chanceSep 30
20% chanceOct 4
30% chanceOct 7
40% chanceOct 11
50% chanceOct 15
60% chanceOct 18
70% chanceOct 21
80% chanceOct 24
90% chanceOct 30
Probability of moderate freeze (28°F) on or before...
10% chanceOct 10
20% chanceOct 17
30% chanceOct 20
40% chanceOct 24
50% chanceOct 27
60% chanceOct 31
70% chanceNov 3
80% chanceNov 9
90% chanceNov 16
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 21
20% chanceOct 27
30% chanceNov 1
40% chanceNov 5
50% chanceNov 10
60% chanceNov 15
70% chanceNov 20
80% chanceNov 25
90% chanceDec 1
Probability of hard freeze (20°F) on or before...
10% chanceNov 1
20% chanceNov 9
30% chanceNov 15
40% chanceNov 21
50% chanceNov 26
60% chanceDec 1
70% chanceDec 5
80% chanceDec 10
90% chanceDec 17
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 13
20% chanceNov 24
30% chanceNov 30
40% chanceDec 5
50% chanceDec 9
60% chanceDec 13
70% chanceDec 19
80% chanceDec 25
90% chanceJan 2

Agricultural climatic data from weather station: BOISE AIR TERMINAL (USW00024131)

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