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🍂 First Frost Dates for Tiller, Oregon 97484

The first 36°F frost date is 30% likely to be on Sep 20. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 4. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

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

Agricultural climatic data from weather station: LOST CREEK DAM (USC00355055)

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