Washington Planting Guide & Growing Season
Washington is in USDA hardiness zone with a growing season of 195 days. The average last spring frost is Mar 15 - May 15 and the average first fall frost is Sep 30 - Nov 15.
Growing Conditions in Washington
How Washington Compares
Compare Washington's growing conditions with states that have similar climates.
| State | USDA Zone | Last Frost | First Frost | Season (days) |
|---|---|---|---|---|
| Washington (WA) | Mar 15 - May 15 | Sep 30 - Nov 15 | 195 | |
| Alabama (AL) | Mar 1 - Apr 1 | Oct 25 - Nov 15 | 220 | |
| Alaska (AK) | May 15 - Jun 15 | Aug 15 - Sep 15 | 105 | |
| Arizona (AZ) | Feb 1 - Apr 15 | Oct 15 - Dec 15 | 270 | |
| Arkansas (AR) | Mar 15 - Apr 15 | Oct 15 - Nov 1 | 210 | |
| California (CA) | Jan 15 - Apr 15 | Oct 15 - Dec 31 | 290 |
Frequently Asked Questions About Gardening in Washington
When should I start seeds indoors in Washington?
In Washington, the average last frost date is Mar 15 - May 15. Start most seeds indoors 6-8 weeks before this date. The USDA hardiness zone for Washington is undefined, with a growing season of approximately 195 days.
What USDA hardiness zone is Washington?
Washington falls in USDA hardiness zones undefined. This affects which perennial plants will survive winter and influences optimal planting times.
When is the first frost in Washington?
The average first frost date in Washington is Sep 30 - Nov 15. Plan to harvest cold-sensitive crops before this date or protect them with row covers.
How long is the growing season in Washington?
Washington has an average growing season of 195 days, from the last frost (Mar 15 - May 15) to first frost (Sep 30 - Nov 15). This moderate season works well for most common vegetables.
Plan Your Garden
Use our seed starting calculator to get personalized planting dates, or browse all states.