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🍂 First Frost Dates for Winchester, Idaho 83555

A 36°F frost is always a risk here. (See detailed probabilities below.)

A 32°F light freeze is always a risk here. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Winchester, 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% chancealways
20% chancealways
30% chancealways
40% chancealways
50% chancealways
60% chancealways
70% chancealways
80% chancealways
90% chancealways
Probability of light freeze (32°F) on or before...
10% chancealways
20% chancealways
30% chancealways
40% chancealways
50% chancealways
60% chancealways
70% chancealways
80% chancealways
90% chancealways
Probability of moderate freeze (28°F) on or before...
10% chanceSep 13
20% chanceSep 20
30% chanceSep 24
40% chanceSep 27
50% chanceOct 1
60% chanceOct 4
70% chanceOct 7
80% chanceOct 12
90% chanceOct 18
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 27
20% chanceOct 3
30% chanceOct 7
40% chanceOct 13
50% chanceOct 18
60% chanceOct 21
70% chanceOct 26
80% chanceOct 31
90% chanceNov 6
Probability of hard freeze (20°F) on or before...
10% chanceOct 12
20% chanceOct 21
30% chanceOct 26
40% chanceOct 31
50% chanceNov 3
60% chanceNov 8
70% chanceNov 13
80% chanceNov 18
90% chanceNov 25
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 23
20% chanceNov 1
30% chanceNov 6
40% chanceNov 12
50% chanceNov 16
60% chanceNov 22
70% chanceNov 27
80% chanceDec 2
90% chanceDec 9

Agricultural climatic data from weather station: WINCHESTER (USC00109846)

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