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🍂 First Frost Dates for Willits, California 95490

A 36°F frost is always a risk here. (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 Willits, 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% 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% chanceSep 15
20% chanceSep 23
30% chanceSep 28
40% chanceOct 2
50% chanceOct 5
60% chanceOct 8
70% chanceOct 13
80% chanceOct 17
90% chanceOct 23
Probability of moderate freeze (28°F) on or before...
10% chanceOct 4
20% chanceOct 10
30% chanceOct 15
40% chanceOct 20
50% chanceOct 24
60% chanceOct 28
70% chanceNov 1
80% chanceNov 6
90% chanceNov 18
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 22
20% chanceNov 1
30% chanceNov 5
40% chanceNov 12
50% chanceNov 18
60% chanceNov 25
70% chanceDec 2
80% chanceDec 9
90% chanceDec 22
Probability of hard freeze (20°F) on or before...
10% chanceNov 12
20% chanceNov 21
30% chanceNov 29
40% chanceDec 4
50% chanceDec 11
60% chanceDec 17
70% chanceDec 26
80% chanceJan 4
90% chanceJan 26
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 26
20% chanceDec 4
30% chanceDec 11
40% chanceDec 18
50% chanceDec 26
60% chanceDec 31
70% chanceJan 6
80% chanceJan 19
90% chanceFeb 1

Agricultural climatic data from weather station: WILLITS 1 NE (USC00049684)

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