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🍂 First Frost Dates for Monroe, Oregon 97456

The first 36°F frost date is 30% likely to be on Oct 6. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 27. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Monroe, 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 27
20% chanceOct 2
30% chanceOct 6
40% chanceOct 10
50% chanceOct 13
60% chanceOct 16
70% chanceOct 19
80% chanceOct 22
90% chanceOct 27
Probability of light freeze (32°F) on or before...
10% chanceOct 18
20% chanceOct 23
30% chanceOct 27
40% chanceOct 30
50% chanceNov 1
60% chanceNov 5
70% chanceNov 10
80% chanceNov 15
90% chanceNov 23
Probability of moderate freeze (28°F) on or before...
10% chanceNov 1
20% chanceNov 6
30% chanceNov 12
40% chanceNov 17
50% chanceNov 23
60% chanceNov 30
70% chanceDec 4
80% chanceDec 10
90% chanceDec 20
Probability of moderate hard freeze (24°F) on or before...
10% chanceNov 12
20% chanceNov 24
30% chanceDec 1
40% chanceDec 7
50% chanceDec 13
60% chanceDec 20
70% chanceDec 28
80% chanceJan 4
90% chanceJan 20
Probability of hard freeze (20°F) on or before...
10% chanceNov 29
20% chanceDec 7
30% chanceDec 13
40% chanceDec 20
50% chanceDec 26
60% chanceDec 31
70% chanceJan 8
80% chanceJan 22
90% chanceFeb 3
Probability of severe hard freeze (16°F) on or before...
10% chanceDec 5
20% chanceDec 11
30% chanceDec 16
40% chanceDec 21
50% chanceDec 27
60% chanceDec 30
70% chanceJan 6
80% chanceJan 24
90% chanceFeb 5

Agricultural climatic data from weather station: CORVALLIS WATER BUREAU (USC00351877)

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