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🍂 First Frost Dates for Royal City, Washington 99357

The first 36°F frost date is 30% likely to be on Sep 24. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 2. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

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

Agricultural climatic data from weather station: SMYRNA (USC00457727)

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