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🍂 First Frost Dates for Keller, Washington 99140

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

The first 32°F light freeze date is 30% likely to be on Oct 9. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Keller, 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 20
20% chanceSep 26
30% chanceSep 30
40% chanceOct 2
50% chanceOct 4
60% chanceOct 6
70% chanceOct 9
80% chanceOct 12
90% chanceOct 17
Probability of light freeze (32°F) on or before...
10% chanceOct 2
20% chanceOct 6
30% chanceOct 9
40% chanceOct 13
50% chanceOct 16
60% chanceOct 18
70% chanceOct 21
80% chanceOct 25
90% chanceOct 30
Probability of moderate freeze (28°F) on or before...
10% chanceOct 12
20% chanceOct 18
30% chanceOct 22
40% chanceOct 25
50% chanceOct 28
60% chanceNov 1
70% chanceNov 4
80% chanceNov 8
90% chanceNov 15
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 21
20% chanceOct 28
30% chanceNov 1
40% chanceNov 5
50% chanceNov 9
60% chanceNov 14
70% chanceNov 19
80% chanceNov 23
90% chanceNov 30
Probability of hard freeze (20°F) on or before...
10% chanceOct 31
20% chanceNov 7
30% chanceNov 13
40% chanceNov 19
50% chanceNov 24
60% chanceNov 29
70% chanceDec 3
80% chanceDec 8
90% chanceDec 15
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 11
20% chanceNov 21
30% chanceNov 27
40% chanceDec 2
50% chanceDec 6
60% chanceDec 11
70% chanceDec 17
80% chanceDec 23
90% chanceDec 30

Agricultural climatic data from weather station: COULEE DAM 1 SW (USC00451767)

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