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🍂 First Frost Dates for Weiser, Idaho 83672

The first 36°F frost date is 30% likely to be on Sep 23. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 3. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

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

Agricultural climatic data from weather station: WEISER (USC00109638)

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