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🍂 First Frost Dates for Siletz, Oregon 97380

The first 36°F frost date is 30% likely to be on Oct 27. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Nov 16. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

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

Agricultural climatic data from weather station: NEWPORT (USW00024285)

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