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🍂 First Frost Dates for Adrian, Oregon 97901

The first 36°F frost date is 30% likely to be on Sep 13. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 25. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Adrian, 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 2
20% chanceSep 9
30% chanceSep 13
40% chanceSep 16
50% chanceSep 20
60% chanceSep 23
70% chanceSep 26
80% chanceSep 30
90% chanceOct 4
Probability of light freeze (32°F) on or before...
10% chanceSep 14
20% chanceSep 20
30% chanceSep 25
40% chanceSep 28
50% chanceOct 1
60% chanceOct 4
70% chanceOct 7
80% chanceOct 11
90% chanceOct 16
Probability of moderate freeze (28°F) on or before...
10% chanceSep 27
20% chanceOct 2
30% chanceOct 7
40% chanceOct 10
50% chanceOct 14
60% chanceOct 17
70% chanceOct 20
80% chanceOct 23
90% chanceOct 29
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 10
20% chanceOct 18
30% chanceOct 22
40% chanceOct 25
50% chanceOct 28
60% chanceOct 31
70% chanceNov 2
80% chanceNov 6
90% chanceNov 13
Probability of hard freeze (20°F) on or before...
10% chanceOct 24
20% chanceOct 30
30% chanceNov 2
40% chanceNov 5
50% chanceNov 9
60% chanceNov 13
70% chanceNov 18
80% chanceNov 22
90% chanceNov 28
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 2
20% chanceNov 9
30% chanceNov 14
40% chanceNov 19
50% chanceNov 23
60% chanceNov 27
70% chanceDec 1
80% chanceDec 6
90% chanceDec 14

Agricultural climatic data from weather station: OWYHEE DAM (USC00356405)

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