The last 36°F Spring frost date is 30% likely to be on May 30. (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 College Place, 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 | Jun 12 |
| 20% chance | Jun 4 |
| 30% chance | May 30 |
| 40% chance | May 26 |
| 50% chance | May 22 |
| 60% chance | May 18 |
| 70% chance | May 15 |
| 80% chance | May 11 |
| 90% chance | May 6 |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | May 21 |
| 20% chance | May 15 |
| 30% chance | May 10 |
| 40% chance | May 7 |
| 50% chance | May 4 |
| 60% chance | May 1 |
| 70% chance | Apr 28 |
| 80% chance | Apr 24 |
| 90% chance | Apr 18 |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | May 3 |
| 20% chance | Apr 28 |
| 30% chance | Apr 24 |
| 40% chance | Apr 20 |
| 50% chance | Apr 15 |
| 60% chance | Apr 10 |
| 70% chance | Apr 4 |
| 80% chance | Mar 30 |
| 90% chance | Mar 24 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | Apr 15 |
| 20% chance | Apr 7 |
| 30% chance | Mar 31 |
| 40% chance | Mar 27 |
| 50% chance | Mar 21 |
| 60% chance | Mar 15 |
| 70% chance | Mar 10 |
| 80% chance | Mar 3 |
| 90% chance | Feb 22 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | Mar 21 |
| 20% chance | Mar 11 |
| 30% chance | Mar 5 |
| 40% chance | Feb 28 |
| 50% chance | Feb 25 |
| 60% chance | Feb 19 |
| 70% chance | Feb 11 |
| 80% chance | Feb 3 |
| 90% chance | Jan 21 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | Mar 3 |
| 20% chance | Feb 25 |
| 30% chance | Feb 19 |
| 40% chance | Feb 13 |
| 50% chance | Feb 6 |
| 60% chance | Feb 1 |
| 70% chance | Jan 22 |
| 80% chance | Jan 12 |
| 90% chance | Jan 2 |
Agricultural climatic data from weather station: WHITMAN MISSION (USC00459200)