The last 36°F Spring frost date is 30% likely to be on May 19. (See detailed probabilities below.)
The last 32°F light freeze date is 30% likely to be on Apr 27. (See detailed probabilities below.)
(See also 🍂 First Fall Frost Dates.)
Last 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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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!
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.
| Probability of frost (36°F) on or after… | |
|---|---|
| 10% chance | May 30 |
| 20% chance | May 23 |
| 30% chance | May 19 |
| 40% chance | May 15 |
| 50% chance | May 12 |
| 60% chance | May 8 |
| 70% chance | May 4 |
| 80% chance | Apr 30 |
| 90% chance | Apr 25 |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | May 5 |
| 20% chance | May 1 |
| 30% chance | Apr 27 |
| 40% chance | Apr 22 |
| 50% chance | Apr 17 |
| 60% chance | Apr 11 |
| 70% chance | Apr 5 |
| 80% chance | Mar 30 |
| 90% chance | Mar 21 |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | Apr 1 |
| 20% chance | Mar 23 |
| 30% chance | Mar 13 |
| 40% chance | Mar 3 |
| 50% chance | Feb 27 |
| 60% chance | Feb 22 |
| 70% chance | Feb 17 |
| 80% chance | Feb 9 |
| 90% chance | Jan 31 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | Feb 22 |
| 20% chance | Feb 16 |
| 30% chance | Feb 10 |
| 40% chance | Feb 4 |
| 50% chance | Feb 1 |
| 60% chance | Jan 24 |
| 70% chance | Jan 14 |
| 80% chance | Jan 5 |
| 90% chance | Dec 24 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | Feb 17 |
| 20% chance | Feb 8 |
| 30% chance | Feb 2 |
| 40% chance | Jan 24 |
| 50% chance | Jan 12 |
| 60% chance | Jan 5 |
| 70% chance | Dec 31 |
| 80% chance | Dec 23 |
| 90% chance | Dec 13 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | Feb 11 |
| 20% chance | Feb 2 |
| 30% chance | Jan 21 |
| 40% chance | Jan 6 |
| 50% chance | Dec 31 |
| 60% chance | Dec 28 |
| 70% chance | Dec 22 |
| 80% chance | Dec 16 |
| 90% chance | Dec 10 |
Agricultural climatic data from weather station: CORVALLIS WATER BUREAU (USC00351877)