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🍂 First Frost Dates for Rhododendron, Oregon 97049

The first 36°F frost date is 30% likely to be on Nov 1. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Nov 22. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Rhododendron, 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 23
20% chanceOct 29
30% chanceNov 1
40% chanceNov 6
50% chanceNov 11
60% chanceNov 16
70% chanceNov 21
80% chanceNov 26
90% chanceDec 2
Probability of light freeze (32°F) on or before...
10% chanceNov 8
20% chanceNov 15
30% chanceNov 22
40% chanceNov 28
50% chanceDec 2
60% chanceDec 6
70% chanceDec 10
80% chanceDec 15
90% chanceDec 23
Probability of moderate freeze (28°F) on or before...
10% chanceNov 24
20% chanceDec 2
30% chanceDec 8
40% chanceDec 13
50% chanceDec 20
60% chanceDec 27
70% chanceJan 1
80% chanceJan 9
90% chanceJan 23
Probability of moderate hard freeze (24°F) on or before...
10% chanceDec 2
20% chanceDec 10
30% chanceDec 18
40% chanceDec 25
50% chanceDec 30
60% chanceJan 4
70% chanceJan 13
80% chanceJan 24
90% chanceFeb 4
Probability of hard freeze (20°F) on or before...
10% chanceDec 8
20% chanceDec 16
30% chanceDec 23
40% chanceDec 27
50% chanceDec 31
60% chanceJan 4
70% chanceJan 11
80% chanceJan 21
90% chanceFeb 2
Probability of severe hard freeze (16°F) on or before...
10% chanceDec 12
20% chanceDec 21
30% chanceDec 26
40% chanceDec 29
50% chanceJan 1
60% chanceJan 4
70% chanceJan 8
80% chanceJan 17
90% chanceFeb 1

Agricultural climatic data from weather station: BONNEVILLE DAM (USC00350897)

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