DibbleWashington frost dates: first and last freeze
Washington spans USDA Zones 4 to 9, so frost arrives on different dates across the state. Most of Washington sits in Zone 8, where the last spring frost falls around March 13 and the first fall frost around November 18.
| Zone | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Zone 4 | May 10 | October 5 | 148 |
| Zone 5 | May 3 | October 12 | 162 |
| Zone 6 | April 25 | October 21 | 179 |
| Zone 7 | April 8 | November 1 | 207 |
| Zone 8 (most common) | March 13 | November 18 | 250 |
| Zone 9 | February 10 | December 10 | 303 |
These are typical dates for the zone, not a forecast. A frost can land a couple of weeks either side, and your own yard has its own microclimate. Dibble pins the dates to your garden's own location and sends a frost warning the evening before a cold night: one a season free, and live alerts all season with Premium.
What to do with these dates in Washington
- Count back from the last spring frost to know when to start seeds indoors.
- Wait until after it to move out tomatoes, peppers, and anything else frost-tender.
- Count back from the first fall frost to find the last useful sowing date.
- Cover or harvest before the first fall frost lands.
Keep exploring
The Washington planting calendar · Last sowing dates by zone · Frost dates for every state
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