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🍂 First Frost Dates for Lewiston, Idaho 83501

The first 36°F frost date is 30% likely to be on Oct 5. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 17. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

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

Agricultural climatic data from weather station: LEWISTON NEZ PERCE CO AP (USW00024149)

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