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🍂 First Frost Dates for Hume, California 93628

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 Oct 1. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Hume, 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 21
20% chanceSep 27
30% chanceOct 1
40% chanceOct 6
50% chanceOct 10
60% chanceOct 14
70% chanceOct 19
80% chanceOct 26
90% chanceNov 4
Probability of moderate freeze (28°F) on or before...
10% chanceOct 1
20% chanceOct 8
30% chanceOct 14
40% chanceOct 19
50% chanceOct 24
60% chanceOct 30
70% chanceNov 4
80% chanceNov 9
90% chanceNov 15
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 15
20% chanceOct 25
30% chanceOct 31
40% chanceNov 5
50% chanceNov 9
60% chanceNov 13
70% chanceNov 17
80% chanceNov 22
90% chanceNov 29
Probability of hard freeze (20°F) on or before...
10% chanceNov 1
20% chanceNov 9
30% chanceNov 15
40% chanceNov 19
50% chanceNov 23
60% chanceNov 27
70% chanceDec 2
80% chanceDec 7
90% chanceDec 15
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 17
20% chanceNov 25
30% chanceNov 30
40% chanceDec 4
50% chanceDec 9
60% chanceDec 14
70% chanceDec 20
80% chanceDec 29
90% chanceJan 11

Agricultural climatic data from weather station: GRANT GROVE (USC00043551)

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