A 36°F frost is always a risk here. (See detailed probabilities below.)
The last 32°F light freeze date is 30% likely to be on Jun 2. (See detailed probabilities below.)
(See also 🍂 First Fall Frost Dates.)
Last frost date probabilities for Prospect, 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 | always |
| 20% chance | always |
| 30% chance | always |
| 40% chance | always |
| 50% chance | always |
| 60% chance | always |
| 70% chance | always |
| 80% chance | always |
| 90% chance | always |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | Jun 18 |
| 20% chance | Jun 9 |
| 30% chance | Jun 2 |
| 40% chance | May 30 |
| 50% chance | May 25 |
| 60% chance | May 20 |
| 70% chance | May 15 |
| 80% chance | May 9 |
| 90% chance | Apr 30 |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | May 22 |
| 20% chance | May 14 |
| 30% chance | May 7 |
| 40% chance | May 2 |
| 50% chance | Apr 28 |
| 60% chance | Apr 24 |
| 70% chance | Apr 18 |
| 80% chance | Apr 10 |
| 90% chance | Apr 1 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | Apr 23 |
| 20% chance | Apr 11 |
| 30% chance | Apr 3 |
| 40% chance | Mar 27 |
| 50% chance | Mar 21 |
| 60% chance | Mar 13 |
| 70% chance | Mar 3 |
| 80% chance | Feb 24 |
| 90% chance | Feb 12 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | Mar 11 |
| 20% chance | Feb 28 |
| 30% chance | Feb 21 |
| 40% chance | Feb 15 |
| 50% chance | Feb 8 |
| 60% chance | Feb 2 |
| 70% chance | Jan 27 |
| 80% chance | Jan 15 |
| 90% chance | Jan 1 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | Feb 21 |
| 20% chance | Feb 12 |
| 30% chance | Feb 4 |
| 40% chance | Jan 29 |
| 50% chance | Jan 21 |
| 60% chance | Jan 11 |
| 70% chance | Jan 4 |
| 80% chance | Dec 29 |
| 90% chance | Dec 16 |
Agricultural climatic data from weather station: PROSPECT 2 SW (USC00356907)