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🍂 First Frost Dates for Oak Harbor, Washington 98277

The first 36°F frost date is 30% likely to be on Oct 12. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 28. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Oak Harbor, 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 2
20% chanceOct 7
30% chanceOct 12
40% chanceOct 16
50% chanceOct 19
60% chanceOct 22
70% chanceOct 26
80% chanceOct 30
90% chanceNov 5
Probability of light freeze (32°F) on or before...
10% chanceOct 17
20% chanceOct 23
30% chanceOct 28
40% chanceNov 1
50% chanceNov 5
60% chanceNov 9
70% chanceNov 14
80% chanceNov 21
90% chanceNov 28
Probability of moderate freeze (28°F) on or before...
10% chanceNov 1
20% chanceNov 9
30% chanceNov 15
40% chanceNov 22
50% chanceNov 28
60% chanceDec 2
70% chanceDec 7
80% chanceDec 14
90% chanceDec 25
Probability of moderate hard freeze (24°F) on or before...
10% chanceNov 17
20% chanceNov 28
30% chanceDec 4
40% chanceDec 9
50% chanceDec 16
60% chanceDec 24
70% chanceDec 30
80% chanceJan 7
90% chanceJan 28
Probability of hard freeze (20°F) on or before...
10% chanceNov 30
20% chanceDec 7
30% chanceDec 15
40% chanceDec 22
50% chanceDec 28
60% chanceJan 1
70% chanceJan 8
80% chanceJan 22
90% chanceFeb 6
Probability of severe hard freeze (16°F) on or before...
10% chanceDec 5
20% chanceDec 12
30% chanceDec 20
40% chanceDec 26
50% chanceDec 30
60% chanceJan 1
70% chanceJan 6
80% chanceJan 18
90% chanceFeb 2

Agricultural climatic data from weather station: WHIDBEY ISLAND NAS (USW00024255)

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