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🍂 First Frost Dates for Twin Falls, Idaho 83301

The first 36°F frost date is 30% likely to be on Sep 16. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 28. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Twin 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 9
20% chanceSep 13
30% chanceSep 16
40% chanceSep 19
50% chanceSep 22
60% chanceSep 24
70% chanceSep 27
80% chanceOct 1
90% chanceOct 5
Probability of light freeze (32°F) on or before...
10% chanceSep 19
20% chanceSep 24
30% chanceSep 28
40% chanceOct 1
50% chanceOct 3
60% chanceOct 6
70% chanceOct 9
80% chanceOct 13
90% chanceOct 18
Probability of moderate freeze (28°F) on or before...
10% chanceOct 1
20% chanceOct 6
30% chanceOct 11
40% chanceOct 15
50% chanceOct 18
60% chanceOct 21
70% chanceOct 24
80% chanceOct 27
90% chanceNov 1
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 18
20% chanceOct 23
30% chanceOct 26
40% chanceOct 29
50% chanceNov 1
60% chanceNov 4
70% chanceNov 8
80% chanceNov 13
90% chanceNov 19
Probability of hard freeze (20°F) on or before...
10% chanceOct 28
20% chanceNov 1
30% chanceNov 6
40% chanceNov 11
50% chanceNov 14
60% chanceNov 18
70% chanceNov 22
80% chanceNov 26
90% chanceDec 1
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 5
20% chanceNov 12
30% chanceNov 17
40% chanceNov 22
50% chanceNov 25
60% chanceNov 29
70% chanceDec 2
80% chanceDec 7
90% chanceDec 14

Agricultural climatic data from weather station: TWIN FALLS-KMVT (USC00109293)

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