When to Plant Cabbage in Washington (2026 Guide)
When planning to grow cabbage in Washington, knowing your frost dates is crucial. If you're in Zone 6b, the median last spring frost occurs around April 9, making early spring a prime time to get your plants started. For a successful cabbage harvest, understanding the timing of these frosts can significantly impact your yields and storage abilities.
For those in Zone 6a, the timing shifts slightly; the last spring frost is typically on April 20, allowing for a bit more flexibility with planting dates. It is essential to choose varieties that match your growing season, especially if you want to enjoy cabbage during the cooler months after summer heat settles in.
Finally, if you're located in Zone 5b, the last spring frost doesn't arrive until May 6. This zone experiences a shorter frost-free season, approximately 150 days, making it vital to plant your cabbage sprouts in a timely manner to ensure they mature before the first fall frost on October 3.
Planting Schedule by USDA Zone in Washington
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 6b | Start February 15 – March 1, ~6–8 weeks before April 9 | Transplant outdoors March 30 – April 9, after the last frost | Direct sow April 10 – April 20, post-frost | Harvest from June 1 – October 15, before October 26 |
| Zone 6a | Start February 15 – March 1, ~6–8 weeks before April 20 | Transplant outdoors April 10 – April 20, after the last frost | Direct sow April 21 – May 1, allowing for spring growth | Harvest from June 15 – October 15, before October 19 |
| Zone 5b | Start March 1 – March 15, ~6–8 weeks before May 6 | Transplant outdoors May 1 – May 10, after the last frost | Direct sow May 11 – May 20, ensuring sufficient warm soil | Harvest from July 1 – October 1, before October 3 |
Cabbage Planting Windows in Washington
- Indoor start: Start your cabbage seeds indoors between February 15 and March 1 for optimal growth in Washington's varied climates.
- Transplant outdoors: The best time to transplant your cabbage seedlings outdoors is from March 30 to April 20, depending on your specific zone.
- Harvest: Expect to harvest cabbage from June 1 to October 15, ensuring you pick before the first fall frost on October 19.
Common Mistakes Growing Cabbage in Washington
- One mistake many Washington gardeners make is starting cabbage too late in the season. Given the relatively short growing window in certain regions, particularly in Zone 5b, this can stunt growth and yield.
- Failing to account for the unique climate conditions in Washington often leads to unexpected pest issues. Slugs thrive in the damp conditions, which can devastate your cabbage crops if not managed early.
- Many gardeners neglect soil health, particularly in acidic areas. In Washington, proper liming of the soil is essential to keeping cabbage healthy and preventing clubroot disease from thriving.
- In cooler zones, some growers underestimate the importance of cool temperatures for cabbage. Planning for the right transplant dates based on actual frost dates can significantly improve head quality.
- Overwatering is a common pitfall in humid areas of Washington, especially in early spring. Make sure the soil has adequate drainage to prevent root diseases when growing cabbage.
Frequently Asked Questions
What if I'm in a cold pocket of Washington?
If you're in a colder area, focus on the right cabbage varieties. Consider starting indoors even earlier and wait until after the last frost to transplant. Utilize cold frames or row covers to extend your growing season.
Can I still plant cabbage in May?
While late planting in May is possible in Zone 5b, you'll need to choose fast-growing cabbage varieties. Keep in mind that this could limit the size and quantity of your harvest before the fall frost arrives.
How can I prevent slugs from damaging my cabbage?
To deter slugs, use organic slug bait around your plants. Installing copper tape or using beer traps can also effectively manage these pests, especially in the humid and wet climates found in Washington.
What is the best way to store harvested cabbage?
Cabbage can be stored in a root cellar or refrigerator. Keep it in a cool, dark place with high humidity to maintain its freshness. Cabbage can often last several months under proper storage conditions.
Is cabbage a heavy feeder?
Cabbage requires decent soil fertility but isn't classified as a heavy feeder. Regular soil amendments, especially with lime, will help, but avoid over-fertilization which can lead to head splitting.
Keep Learning
City guides in Washington
Other crops in Washington
Typical fall sowing window for Cabbage in Washington: August 2 – August 23.