The last 36°F Spring frost date is 30% likely to be on May 27. (See detailed probabilities below.)
The last 32°F light freeze date is 30% likely to be on May 6. (See detailed probabilities below.)
(See also 🍂 First Fall Frost Dates.)
Last frost date probabilities for Lewiston, 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 5 |
| 20% chance | May 31 |
| 30% chance | May 27 |
| 40% chance | May 23 |
| 50% chance | May 19 |
| 60% chance | May 15 |
| 70% chance | May 10 |
| 80% chance | May 4 |
| 90% chance | Apr 29 |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | May 19 |
| 20% chance | May 12 |
| 30% chance | May 6 |
| 40% chance | May 2 |
| 50% chance | Apr 29 |
| 60% chance | Apr 25 |
| 70% chance | Apr 20 |
| 80% chance | Apr 15 |
| 90% chance | Apr 8 |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | Apr 28 |
| 20% chance | Apr 19 |
| 30% chance | Apr 13 |
| 40% chance | Apr 8 |
| 50% chance | Apr 2 |
| 60% chance | Mar 28 |
| 70% chance | Mar 20 |
| 80% chance | Mar 10 |
| 90% chance | Feb 23 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | Mar 30 |
| 20% chance | Mar 15 |
| 30% chance | Mar 2 |
| 40% chance | Feb 22 |
| 50% chance | Feb 15 |
| 60% chance | Feb 7 |
| 70% chance | Jan 31 |
| 80% chance | Jan 13 |
| 90% chance | Dec 29 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | Feb 19 |
| 20% chance | Feb 11 |
| 30% chance | Feb 3 |
| 40% chance | Jan 29 |
| 50% chance | Jan 18 |
| 60% chance | Jan 7 |
| 70% chance | Jan 1 |
| 80% chance | Dec 23 |
| 90% chance | Dec 8 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | Feb 6 |
| 20% chance | Jan 30 |
| 30% chance | Jan 23 |
| 40% chance | Jan 10 |
| 50% chance | Jan 2 |
| 60% chance | Dec 29 |
| 70% chance | Dec 22 |
| 80% chance | Dec 15 |
| 90% chance | Dec 8 |
Agricultural climatic data from weather station: TRINITY RIVER HATCHERY (USC00049026)