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🍂 First Frost Dates for Garden City, Idaho 83714

The first 36°F frost date is 30% likely to be on Sep 20. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 2. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

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

Agricultural climatic data from weather station: BOISE 7 N (USC00101017)

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