The last 36°F Spring frost date is 30% likely to be on May 31. (See detailed probabilities below.)
The last 32°F light freeze date is 30% likely to be on May 10. (See detailed probabilities below.)
(See also 🍂 First Fall Frost Dates.)
Last frost date probabilities for Fossil, 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 | Jun 15 |
| 20% chance | Jun 4 |
| 30% chance | May 31 |
| 40% chance | May 26 |
| 50% chance | May 22 |
| 60% chance | May 19 |
| 70% chance | May 15 |
| 80% chance | May 10 |
| 90% chance | May 4 |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | May 22 |
| 20% chance | May 14 |
| 30% chance | May 10 |
| 40% chance | May 6 |
| 50% chance | May 3 |
| 60% chance | Apr 30 |
| 70% chance | Apr 26 |
| 80% chance | Apr 21 |
| 90% chance | Apr 13 |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | May 3 |
| 20% chance | Apr 27 |
| 30% chance | Apr 21 |
| 40% chance | Apr 15 |
| 50% chance | Apr 10 |
| 60% chance | Apr 5 |
| 70% chance | Mar 30 |
| 80% chance | Mar 23 |
| 90% chance | Mar 8 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | Apr 10 |
| 20% chance | Mar 31 |
| 30% chance | Mar 24 |
| 40% chance | Mar 14 |
| 50% chance | Mar 6 |
| 60% chance | Feb 28 |
| 70% chance | Feb 21 |
| 80% chance | Feb 13 |
| 90% chance | Feb 1 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | Mar 10 |
| 20% chance | Feb 28 |
| 30% chance | Feb 22 |
| 40% chance | Feb 16 |
| 50% chance | Feb 11 |
| 60% chance | Feb 4 |
| 70% chance | Jan 28 |
| 80% chance | Jan 15 |
| 90% chance | Jan 2 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | Feb 25 |
| 20% chance | Feb 18 |
| 30% chance | Feb 12 |
| 40% chance | Feb 5 |
| 50% chance | Jan 31 |
| 60% chance | Jan 20 |
| 70% chance | Jan 10 |
| 80% chance | Jan 2 |
| 90% chance | Dec 21 |
Agricultural climatic data from weather station: FOSSIL (USC00353038)