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🍂 First Frost Dates for Foster, Oregon 97345

The first 36°F frost date is 30% likely to be on Sep 21. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 10. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

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

Agricultural climatic data from weather station: FOSTER DAM (USC00353047)

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