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🍂 First Frost Dates for Plymouth, Washington 99346

The first 36°F frost date is 30% likely to be on Oct 17. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 27. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Plymouth, WA 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% chanceOct 7
20% chanceOct 13
30% chanceOct 17
40% chanceOct 19
50% chanceOct 22
60% chanceOct 24
70% chanceOct 27
80% chanceOct 30
90% chanceNov 4
Probability of light freeze (32°F) on or before...
10% chanceOct 19
20% chanceOct 24
30% chanceOct 27
40% chanceOct 30
50% chanceNov 1
60% chanceNov 5
70% chanceNov 9
80% chanceNov 14
90% chanceNov 22
Probability of moderate freeze (28°F) on or before...
10% chanceOct 29
20% chanceNov 2
30% chanceNov 7
40% chanceNov 13
50% chanceNov 18
60% chanceNov 24
70% chanceNov 29
80% chanceDec 4
90% chanceDec 12
Probability of moderate hard freeze (24°F) on or before...
10% chanceNov 6
20% chanceNov 15
30% chanceNov 25
40% chanceDec 1
50% chanceDec 5
60% chanceDec 10
70% chanceDec 16
80% chanceDec 22
90% chanceJan 1
Probability of hard freeze (20°F) on or before...
10% chanceNov 17
20% chanceDec 1
30% chanceDec 7
40% chanceDec 13
50% chanceDec 20
60% chanceDec 27
70% chanceJan 1
80% chanceJan 11
90% chanceJan 27
Probability of severe hard freeze (16°F) on or before...
10% chanceDec 2
20% chanceDec 9
30% chanceDec 15
40% chanceDec 21
50% chanceDec 28
60% chanceJan 1
70% chanceJan 9
80% chanceJan 21
90% chanceFeb 1

Agricultural climatic data from weather station: MCNARY DAM (USC00455231)

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