When to Plant Turnip in Washington (2026 Guide)
If you're considering adding turnips to your garden in Washington, you're in for a treat! Known for their fast growth and cold-hardiness, turnips can be planted in both spring and fall, making them a versatile choice for gardeners. With a median last spring frost date of April 20 in places like Auburn and a first fall frost average of October 19, you have a solid window to cultivate these flavorful root vegetables.
Turnips thrive in cooler temperatures and actually taste sweeter when harvested after a frost, making the transition into fall particularly rewarding. With proper care and the right timing, you can enjoy a bountiful harvest of turnips and their delicious greens. Their rapid growth cycle of 30 to 60 days means you can enjoy them in a variety of dishes, from soups to salads.
Whether you're a novice gardener in Spokane or an experienced grower in Seattle, understanding the local climate and frost dates is crucial for the successful cultivation of turnips. Each USDA hardiness zone has its planting dates, direct sowing tips, and harvest guidelines that are key for maximizing your yields.
Planting Schedule by USDA Zone in Washington
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 6b | Not recommended — direct sow only. | Not recommended — direct sow only. | Start March 10 – April 10, ~4–6 weeks after April 9. | Harvest from June 10 – September 30, ideally before October 26. |
| Zone 6a | Not recommended — direct sow only. | Not recommended — direct sow only. | Start March 25 – April 20, ~4–6 weeks after April 20. | Harvest from June 10 – September 30, ideally before October 19. |
| Zone 5b | Not recommended — direct sow only. | Not recommended — direct sow only. | Start April 15 – May 6, ~2–4 weeks after May 6. | Harvest from June 1 – August 15, ideally before October 3. |
Turnip Planting Windows in Washington
- Indoor start: Indoor starting is not recommended for turnips in any USDA zone in Washington, as they thrive best when directly sown in the ground.
- Transplant outdoors: Outdoor transplanting of turnips is not advised since they are best grown from direct sowing, which should be timed based on local frost dates.
- Harvest: Turnip roots in Washington are typically ready to be harvested from June through October, depending on your planting time.
Common Mistakes Growing Turnip in Washington
- One common mistake for Washington gardeners is planting turnips too late in the season, particularly in higher elevation areas near Spokane where temperatures drop earlier. This can result in stunted growth or poor flavor.
- Many novice gardeners in Washington overlook the importance of direct sowing for turnips. Because turnips develop taproots, starting seeds indoors can lead to transplant shock, affecting the overall growth and yield.
- Failing to thin seedlings adequately is a mistake frequently seen among Washington’s turnip growers. Proper spacing of 4–6 inches can often be disregarded, resulting in misshapen roots that are less palatable.
- Some gardeners incorrectly believe that turnips can be overwintered successfully in all regions of Washington. While they are hardy, freezing temperatures can damage roots if not harvested or adequately mulched in zones with harsh winters.
- In Washington's humid climate, watering is crucial, but overwatering can lead to root rot in turnips. Many growers, particularly near coastal regions, may not take into account the moisture retention of their soil.
Frequently Asked Questions
What if I'm in a cold pocket of Washington?
If you're in a colder area, adjust your planting dates to accommodate your local climate. Consider using season extenders like row covers to help protect young plants from late spring frosts.
Can I still plant turnip in May?
While May is on the later side for most areas in Washington, particularly in Zone 5b, you can still direct sow turnips early in the month. Just be prepared for a shorter growing season.
How do I know when to harvest my turnips?
Turnips are ready for harvest when they reach 2–3 inches in diameter. They should be crisp and have a mild flavor. Check them regularly as warm weather can cause them to become pithy.
Will frost hurt my turnips?
Turnips can actually improve in flavor with frost. However, prolonged freezing can damage the roots. It's best to harvest before the ground freezes solid, especially in late fall.
What are the best growing conditions for turnips?
Turnips thrive in cool weather, well-drained soil, and full sunlight. Ensure adequate moisture but avoid overwatering to prevent root rot. Mulching can help retain moisture and protect roots.
Keep Learning
City guides in Washington
Other crops in Washington
Typical fall sowing window for Turnip in Washington: August 22 – September 12.