The last 36°F Spring frost date is 30% likely to be on May 29. (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 Washington, CA 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 6 |
| 20% chance | Jun 1 |
| 30% chance | May 29 |
| 40% chance | May 24 |
| 50% chance | May 17 |
| 60% chance | May 13 |
| 70% chance | May 7 |
| 80% chance | May 1 |
| 90% chance | Apr 26 |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | May 28 |
| 20% chance | May 17 |
| 30% chance | May 10 |
| 40% chance | May 4 |
| 50% chance | Apr 30 |
| 60% chance | Apr 27 |
| 70% chance | Apr 23 |
| 80% chance | Apr 16 |
| 90% chance | Apr 6 |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | May 7 |
| 20% chance | Apr 30 |
| 30% chance | Apr 25 |
| 40% chance | Apr 20 |
| 50% chance | Apr 14 |
| 60% chance | Apr 8 |
| 70% chance | Mar 31 |
| 80% chance | Mar 24 |
| 90% chance | Mar 11 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | Apr 21 |
| 20% chance | Apr 11 |
| 30% chance | Apr 2 |
| 40% chance | Mar 27 |
| 50% chance | Mar 18 |
| 60% chance | Mar 9 |
| 70% chance | Feb 27 |
| 80% chance | Feb 13 |
| 90% chance | Jan 23 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | Apr 1 |
| 20% chance | Mar 18 |
| 30% chance | Mar 4 |
| 40% chance | Feb 21 |
| 50% chance | Feb 10 |
| 60% chance | Jan 29 |
| 70% chance | Jan 14 |
| 80% chance | Jan 4 |
| 90% chance | Dec 24 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | Feb 25 |
| 20% chance | Feb 10 |
| 30% chance | Jan 31 |
| 40% chance | Jan 21 |
| 50% chance | Jan 9 |
| 60% chance | Jan 4 |
| 70% chance | Dec 31 |
| 80% chance | Dec 23 |
| 90% chance | Dec 13 |
Agricultural climatic data from weather station: BLUE CANYON AP (USW00023225)