🌷 Your Ultimate Garden Calendar!

🌷 Last Frost Dates for Portland, Oregon 97204

The last 36°F Spring frost date is 30% likely to be on Apr 14. (See detailed probabilities below.)

The last 32°F light freeze date is 30% likely to be on Mar 11. (See detailed probabilities below.)

(See also 🍂 First Fall Frost Dates.)

Last frost date probabilities for Portland, 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 Last Frost Date?

The last spring frost signals when your area is safe from freezing temperatures. Tender plants can now grow outdoors without cold damage! This marks the beginning of the growing season. Last spring frost serves as your essential starting point for planting warm-season crops. It's also time to remove winter protection from your perennials. Enjoy the longer days and warmer weather!

How to use the Last Frost Date?

Start seeds indoors several weeks before your last frost date. This gives plants time to reach transplanting size when weather permits. Plan your outdoor planting schedule around your area's average last frost date. Plant some crops before and some after this date to protect against weather changes. Look for spots in your yard where frost stays longer or disappears earlier. Create your own frost map to use all available growing space and extend your season. Keep watching your local weather forecast to catch any surprise late frosts.

Last Frost Date Probabilities

Probability of frost (36°F) on or after…
10% chanceApr 27
20% chanceApr 19
30% chanceApr 14
40% chanceApr 9
50% chanceApr 4
60% chanceMar 31
70% chanceMar 26
80% chanceMar 19
90% chanceMar 8
Probability of light freeze (32°F) on or after…
10% chanceMar 29
20% chanceMar 20
30% chanceMar 11
40% chanceMar 2
50% chanceFeb 26
60% chanceFeb 20
70% chanceFeb 14
80% chanceFeb 7
90% chanceJan 28
Probability of moderate freeze (28°F) on or after…
10% chanceFeb 26
20% chanceFeb 18
30% chanceFeb 12
40% chanceFeb 7
50% chanceFeb 1
60% chanceJan 25
70% chanceJan 15
80% chanceJan 5
90% chanceDec 26
Probability of moderate hard freeze (24°F) on or after…
10% chanceFeb 17
20% chanceFeb 8
30% chanceFeb 2
40% chanceJan 25
50% chanceJan 14
60% chanceJan 5
70% chanceJan 1
80% chanceDec 26
90% chanceDec 14
Probability of hard freeze (20°F) on or after…
10% chanceFeb 16
20% chanceFeb 8
30% chanceFeb 2
40% chanceJan 23
50% chanceJan 7
60% chanceJan 2
70% chanceDec 31
80% chanceDec 24
90% chanceDec 15
Probability of severe hard freeze (16°F) on or after…
10% chanceFeb 16
20% chanceFeb 9
30% chanceFeb 4
40% chanceJan 31
50% chanceJan 6
60% chanceJan 1
70% chanceDec 31
80% chanceDec 25
90% chanceDec 16

Agricultural climatic data from weather station: PORTLAND KGW-TV (USC00356749)

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