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🍂 2026 First Frost Dates for Seattle, Washington 98136

The first 36°F frost date is 30% likely to be on Oct 26. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Nov 11. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Seattle, 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 18
20% chanceOct 23
30% chanceOct 26
40% chanceOct 29
50% chanceNov 1
60% chanceNov 4
70% chanceNov 8
80% chanceNov 12
90% chanceNov 17
Probability of light freeze (32°F) on or before...
10% chanceNov 1
20% chanceNov 7
30% chanceNov 11
40% chanceNov 15
50% chanceNov 19
60% chanceNov 23
70% chanceNov 27
80% chanceDec 1
90% chanceDec 8
Probability of moderate freeze (28°F) on or before...
10% chanceNov 12
20% chanceNov 19
30% chanceNov 26
40% chanceDec 1
50% chanceDec 6
60% chanceDec 11
70% chanceDec 18
80% chanceDec 26
90% chanceJan 4
Probability of moderate hard freeze (24°F) on or before...
10% chanceNov 22
20% chanceDec 2
30% chanceDec 9
40% chanceDec 15
50% chanceDec 23
60% chanceDec 30
70% chanceJan 5
80% chanceJan 19
90% chanceFeb 4
Probability of hard freeze (20°F) on or before...
10% chanceDec 1
20% chanceDec 9
30% chanceDec 16
40% chanceDec 22
50% chanceDec 27
60% chanceJan 1
70% chanceJan 7
80% chanceJan 21
90% chanceFeb 5
Probability of severe hard freeze (16°F) on or before...
10% chanceDec 7
20% chanceDec 12
30% chanceDec 18
40% chanceDec 22
50% chanceDec 26
60% chanceDec 29
70% chanceJan 1
80% chanceJan 6
90% chanceJan 29

Agricultural climatic data from weather station: SEATTLE BOEING FLD (USW00024234)

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