The last 36°F Spring frost date is 30% likely to be on Apr 30. (See detailed probabilities below.)
The last 32°F light freeze date is 30% likely to be on Apr 1. (See detailed probabilities below.)
(See also 🍂 First Fall Frost Dates.)
Last frost date probabilities for Lyman, WA 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 9 |
| 20% chance | May 3 |
| 30% chance | Apr 30 |
| 40% chance | Apr 25 |
| 50% chance | Apr 21 |
| 60% chance | Apr 16 |
| 70% chance | Apr 12 |
| 80% chance | Apr 6 |
| 90% chance | Mar 31 |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | Apr 14 |
| 20% chance | Apr 6 |
| 30% chance | Apr 1 |
| 40% chance | Mar 28 |
| 50% chance | Mar 23 |
| 60% chance | Mar 18 |
| 70% chance | Mar 13 |
| 80% chance | Mar 7 |
| 90% chance | Feb 28 |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | Mar 19 |
| 20% chance | Mar 12 |
| 30% chance | Mar 6 |
| 40% chance | Mar 2 |
| 50% chance | Feb 27 |
| 60% chance | Feb 22 |
| 70% chance | Feb 17 |
| 80% chance | Feb 9 |
| 90% chance | Jan 30 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | Mar 2 |
| 20% chance | Feb 24 |
| 30% chance | Feb 18 |
| 40% chance | Feb 11 |
| 50% chance | Feb 4 |
| 60% chance | Jan 29 |
| 70% chance | Jan 17 |
| 80% chance | Jan 6 |
| 90% chance | Dec 29 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | Feb 19 |
| 20% chance | Feb 8 |
| 30% chance | Jan 30 |
| 40% chance | Jan 18 |
| 50% chance | Jan 9 |
| 60% chance | Jan 4 |
| 70% chance | Dec 31 |
| 80% chance | Dec 24 |
| 90% chance | Dec 13 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | Jan 31 |
| 20% chance | Jan 16 |
| 30% chance | Jan 7 |
| 40% chance | Jan 3 |
| 50% chance | Jan 1 |
| 60% chance | Dec 31 |
| 70% chance | Dec 25 |
| 80% chance | Dec 17 |
| 90% chance | Dec 9 |
Agricultural climatic data from weather station: SEDRO WOOLLEY (USC00457507)