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🍂 First Frost Dates for Lewiston, California 96052

The first 36°F frost date is 30% likely to be on Sep 28. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 12. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Lewiston, CA 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 18
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 light freeze (32°F) on or before...
10% chanceOct 3
20% chanceOct 8
30% chanceOct 12
40% chanceOct 16
50% chanceOct 19
60% chanceOct 24
70% chanceOct 28
80% chanceNov 1
90% chanceNov 11
Probability of moderate freeze (28°F) on or before...
10% chanceOct 18
20% chanceOct 26
30% chanceOct 31
40% chanceNov 4
50% chanceNov 11
60% chanceNov 19
70% chanceNov 26
80% chanceDec 4
90% chanceDec 12
Probability of moderate hard freeze (24°F) on or before...
10% chanceNov 5
20% chanceNov 17
30% chanceNov 27
40% chanceDec 5
50% chanceDec 12
60% chanceDec 19
70% chanceDec 27
80% chanceJan 5
90% chanceJan 25
Probability of hard freeze (20°F) on or before...
10% chanceNov 24
20% chanceDec 6
30% chanceDec 14
40% chanceDec 24
50% chanceDec 31
60% chanceJan 7
70% chanceJan 19
80% chanceJan 29
90% chanceFeb 10
Probability of severe hard freeze (16°F) on or before...
10% chanceDec 3
20% chanceDec 11
30% chanceDec 17
40% chanceDec 24
50% chanceDec 30
60% chanceJan 4
70% chanceJan 15
80% chanceJan 26
90% chanceFeb 1

Agricultural climatic data from weather station: TRINITY RIVER HATCHERY (USC00049026)

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