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🍂 First Frost Dates for Jerome, Idaho 83338

The first 36°F frost date is 30% likely to be on Sep 18. (See detailed probabilities below.)

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

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Jerome, 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 9
20% chanceSep 14
30% chanceSep 18
40% chanceSep 21
50% chanceSep 24
60% chanceSep 26
70% chanceSep 29
80% chanceOct 3
90% chanceOct 8
Probability of light freeze (32°F) on or before...
10% chanceSep 20
20% chanceSep 26
30% chanceSep 30
40% chanceOct 3
50% chanceOct 6
60% chanceOct 9
70% chanceOct 13
80% chanceOct 17
90% chanceOct 22
Probability of moderate freeze (28°F) on or before...
10% chanceOct 4
20% chanceOct 10
30% chanceOct 14
40% chanceOct 18
50% chanceOct 21
60% chanceOct 24
70% chanceOct 28
80% chanceNov 1
90% chanceNov 6
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 17
20% chanceOct 22
30% chanceOct 27
40% chanceOct 31
50% chanceNov 3
60% chanceNov 7
70% chanceNov 11
80% chanceNov 15
90% chanceNov 20
Probability of hard freeze (20°F) on or before...
10% chanceOct 28
20% chanceNov 2
30% chanceNov 8
40% chanceNov 12
50% chanceNov 16
60% chanceNov 20
70% chanceNov 24
80% chanceNov 27
90% chanceDec 1
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 8
20% chanceNov 15
30% chanceNov 20
40% chanceNov 24
50% chanceNov 28
60% chanceDec 1
70% chanceDec 4
80% chanceDec 8
90% chanceDec 15

Agricultural climatic data from weather station: JEROME CO AP (USW00004110)

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