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🍂 First Frost Dates for Alleghany, California 95910

The first 36°F frost date is 30% likely to be on Sep 27. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 16. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Alleghany, 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 16
20% chanceSep 22
30% chanceSep 27
40% chanceSep 30
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 5
20% chanceOct 12
30% chanceOct 16
40% chanceOct 19
50% chanceOct 22
60% chanceOct 25
70% chanceOct 29
80% chanceNov 1
90% chanceNov 6
Probability of moderate freeze (28°F) on or before...
10% chanceOct 26
20% chanceNov 1
30% chanceNov 3
40% chanceNov 7
50% chanceNov 10
60% chanceNov 13
70% chanceNov 18
80% chanceNov 23
90% chanceNov 29
Probability of moderate hard freeze (24°F) on or before...
10% chanceNov 11
20% chanceNov 18
30% chanceNov 24
40% chanceNov 29
50% chanceDec 2
60% chanceDec 7
70% chanceDec 12
80% chanceDec 20
90% chanceJan 1
Probability of hard freeze (20°F) on or before...
10% chanceNov 25
20% chanceDec 3
30% chanceDec 9
40% chanceDec 15
50% chanceDec 22
60% chanceDec 29
70% chanceJan 4
80% chanceJan 17
90% chanceFeb 2
Probability of severe hard freeze (16°F) on or before...
10% chanceDec 3
20% chanceDec 10
30% chanceDec 16
40% chanceDec 21
50% chanceDec 26
60% chanceDec 31
70% chanceJan 7
80% chanceJan 28
90% chanceFeb 8

Agricultural climatic data from weather station: DOWNIEVILLE (USC00042500)

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