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🍂 First Frost Dates for Bonney Lake, Washington 98391

The first 36°F frost date is 30% likely to be on Oct 4. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 21. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Bonney Lake, 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% chanceSep 27
20% chanceOct 1
30% chanceOct 4
40% chanceOct 7
50% chanceOct 10
60% chanceOct 14
70% chanceOct 18
80% chanceOct 22
90% chanceOct 28
Probability of light freeze (32°F) on or before...
10% chanceOct 11
20% chanceOct 17
30% chanceOct 21
40% chanceOct 25
50% chanceOct 29
60% chanceNov 1
70% chanceNov 4
80% chanceNov 10
90% chanceNov 17
Probability of moderate freeze (28°F) on or before...
10% chanceOct 27
20% chanceNov 1
30% chanceNov 5
40% chanceNov 10
50% chanceNov 15
60% chanceNov 21
70% chanceNov 28
80% chanceDec 3
90% chanceDec 11
Probability of moderate hard freeze (24°F) on or before...
10% chanceNov 9
20% chanceNov 17
30% chanceNov 26
40% chanceDec 1
50% chanceDec 6
60% chanceDec 12
70% chanceDec 20
80% chanceDec 28
90% chanceJan 11
Probability of hard freeze (20°F) on or before...
10% chanceNov 23
20% chanceDec 1
30% chanceDec 8
40% chanceDec 14
50% chanceDec 20
60% chanceDec 27
70% chanceJan 1
80% chanceJan 16
90% chanceFeb 4
Probability of severe hard freeze (16°F) on or before...
10% chanceDec 1
20% chanceDec 8
30% chanceDec 15
40% chanceDec 21
50% chanceDec 26
60% chanceDec 31
70% chanceJan 5
80% chanceJan 21
90% chanceFeb 6

Agricultural climatic data from weather station: MC MILLIN RSVR (USC00455224)

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