🌷 2026 Last Frost Dates for Richland, Washington 99352
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 13. (See detailed probabilities below.)
(See also 🍂 First Fall Frost Dates.)
Last frost date probabilities for Richland, WA are based on historical climate data.
Always check your local forecast for the most up-to-date frost warnings.
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What is a Last Frost Date?
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!
How to use the Last Frost Date?
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.
Last Frost Date Probabilities
| Probability of frost (36°F) on or after… | |
|---|---|
| 10% chance | May 8 |
| 20% chance | May 3 |
| 30% chance | Apr 30 |
| 40% chance | Apr 28 |
| 50% chance | Apr 25 |
| 60% chance | Apr 22 |
| 70% chance | Apr 18 |
| 80% chance | Apr 15 |
| 90% chance | Apr 11 |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | Apr 24 |
| 20% chance | Apr 17 |
| 30% chance | Apr 13 |
| 40% chance | Apr 10 |
| 50% chance | Apr 6 |
| 60% chance | Apr 3 |
| 70% chance | Mar 31 |
| 80% chance | Mar 28 |
| 90% chance | Mar 22 |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | Apr 5 |
| 20% chance | Mar 31 |
| 30% chance | Mar 27 |
| 40% chance | Mar 23 |
| 50% chance | Mar 18 |
| 60% chance | Mar 14 |
| 70% chance | Mar 11 |
| 80% chance | Mar 6 |
| 90% chance | Mar 1 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | Mar 18 |
| 20% chance | Mar 11 |
| 30% chance | Mar 7 |
| 40% chance | Mar 3 |
| 50% chance | Feb 28 |
| 60% chance | Feb 26 |
| 70% chance | Feb 23 |
| 80% chance | Feb 17 |
| 90% chance | Feb 8 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | Mar 6 |
| 20% chance | Feb 28 |
| 30% chance | Feb 24 |
| 40% chance | Feb 19 |
| 50% chance | Feb 14 |
| 60% chance | Feb 7 |
| 70% chance | Jan 31 |
| 80% chance | Jan 18 |
| 90% chance | Jan 6 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | Feb 27 |
| 20% chance | Feb 18 |
| 30% chance | Feb 10 |
| 40% chance | Feb 1 |
| 50% chance | Jan 24 |
| 60% chance | Jan 15 |
| 70% chance | Jan 7 |
| 80% chance | Jan 1 |
| 90% chance | Dec 17 |
Agricultural climatic data from weather station: RICHLAND (USC00457015:frost)