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🍂 First Frost Dates for Mount Shasta, California 96067

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 25. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Mount Shasta, 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 14
20% chanceSep 21
30% chanceSep 25
40% chanceSep 28
50% chanceOct 1
60% chanceOct 4
70% chanceOct 8
80% chanceOct 12
90% chanceOct 17
Probability of moderate freeze (28°F) on or before...
10% chanceOct 2
20% chanceOct 7
30% chanceOct 12
40% chanceOct 16
50% chanceOct 19
60% chanceOct 22
70% chanceOct 25
80% chanceOct 29
90% chanceNov 4
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 19
20% chanceOct 26
30% chanceOct 30
40% chanceNov 1
50% chanceNov 4
60% chanceNov 8
70% chanceNov 11
80% chanceNov 16
90% chanceNov 22
Probability of hard freeze (20°F) on or before...
10% chanceNov 1
20% chanceNov 6
30% chanceNov 10
40% chanceNov 14
50% chanceNov 19
60% chanceNov 23
70% chanceNov 27
80% chanceDec 2
90% chanceDec 9
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 11
20% chanceNov 18
30% chanceNov 24
40% chanceNov 30
50% chanceDec 4
60% chanceDec 9
70% chanceDec 14
80% chanceDec 22
90% chanceJan 1

Agricultural climatic data from weather station: MT SHASTA (USW00024215)

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