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🍂 First Frost Dates for Renton, Washington 98055

The first 36°F frost date is 30% likely to be on Oct 23. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Nov 7. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

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

Agricultural climatic data from weather station: RENTON MUNI AP (USW00094248)

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