The last 36°F Spring frost date is 30% likely to be on May 18. (See detailed probabilities below.)
The last 32°F light freeze date is 30% likely to be on May 4. (See detailed probabilities below.)
(See also 🍂 First Fall Frost Dates.)
Last frost date probabilities for Ellensburg, 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 27 |
| 20% chance | May 22 |
| 30% chance | May 18 |
| 40% chance | May 15 |
| 50% chance | May 12 |
| 60% chance | May 10 |
| 70% chance | May 7 |
| 80% chance | May 4 |
| 90% chance | Apr 30 |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | May 13 |
| 20% chance | May 7 |
| 30% chance | May 4 |
| 40% chance | May 1 |
| 50% chance | Apr 29 |
| 60% chance | Apr 26 |
| 70% chance | Apr 24 |
| 80% chance | Apr 20 |
| 90% chance | Apr 16 |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | Apr 28 |
| 20% chance | Apr 23 |
| 30% chance | Apr 19 |
| 40% chance | Apr 15 |
| 50% chance | Apr 12 |
| 60% chance | Apr 8 |
| 70% chance | Apr 5 |
| 80% chance | Mar 31 |
| 90% chance | Mar 26 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | Apr 12 |
| 20% chance | Apr 6 |
| 30% chance | Apr 1 |
| 40% chance | Mar 28 |
| 50% chance | Mar 22 |
| 60% chance | Mar 17 |
| 70% chance | Mar 11 |
| 80% chance | Mar 5 |
| 90% chance | Feb 26 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | Mar 24 |
| 20% chance | Mar 12 |
| 30% chance | Mar 5 |
| 40% chance | Feb 28 |
| 50% chance | Feb 25 |
| 60% chance | Feb 20 |
| 70% chance | Feb 15 |
| 80% chance | Feb 9 |
| 90% chance | Feb 1 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | Mar 3 |
| 20% chance | Feb 26 |
| 30% chance | Feb 21 |
| 40% chance | Feb 16 |
| 50% chance | Feb 10 |
| 60% chance | Feb 5 |
| 70% chance | Jan 31 |
| 80% chance | Jan 24 |
| 90% chance | Jan 12 |
Agricultural climatic data from weather station: ELLENSBURG BOWERS FLD (USW00024220)