When to Plant Parsley in Washington (2026 Guide)
Growing parsley in Washington can be a rewarding experience as this popular herb thrives in various climates across the state. Understanding the correct planting times is crucial for gardeners, especially since the median last spring frost dates can range from April 9 in some areas to as late as May 6 in others. These dates affect when you can start sowing seeds or transplanting seedlings into your garden beds.
In Washington, gardeners in Zone 6b, which includes cities like Bellevue and Auburn, can enjoy a roughly 200-day frost-free season, allowing plenty of time to harvest fresh parsley. Zone 5b, found in places like Olympia, has a shorter growing season with a median last frost date of May 6, making timing even more critical for successful herb cultivation. Complicating matters, late spring snowfalls can occasionally surprise gardeners, so staying informed is essential.
For optimal results, it is recommended to start parsley indoors for all zones and then transplant outdoors after the last frost date. By keeping a close eye on local weather conditions and following best practices for caring for this biennial herb, Washington residents can look forward to a fruitful parsley harvest throughout the growing season.
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 April 10 – April 20, after the last frost | Direct sow April 10 – April 25, after the last frost | Harvest from June 1 – October 26, before the first fall frost |
| Zone 6a | Start February 25 – March 10, ~6–8 weeks before April 20 | Transplant outdoors April 21 – May 1, after the last frost | Direct sow April 21 – May 5, after the last frost | Harvest from June 10 – October 19, before the first fall frost |
| Zone 5b | Start March 15 – March 30, ~6–8 weeks before May 6 | Transplant outdoors May 7 – May 15, after the last frost | Direct sow May 7 – May 20, after the last frost | Harvest from June 20 – October 3, before the first fall frost |
Parsley Planting Windows in Washington
- Indoor start: Start parsley seeds indoors between February 15 and March 30.
- Transplant outdoors: Transplant parsley outdoors from April 10 to May 15, depending on your zone.
- Harvest: Harvest parsley from June 1 until October 3 in Washington, adapting to your local last frost date.
Common Mistakes Growing Parsley in Washington
- One common mistake is planting parsley too early in Washington. Due to the varying frost dates across the state, many gardeners risk losing their plants to late frosts, particularly in colder areas like Centralia.
- Another error is overwatering parsley, which can lead to root rot. Washington's seasonal rains can already provide plenty of moisture, so aiming for well-drained soil is essential to prevent standing water around the roots.
- Many new gardeners mistakenly expect parsley to thrive in full shade, especially in Washington's cooler climates. However, parsley actually prefers at least six hours of direct sunlight a day for vigorous growth.
- Over-fertilizing parsley is also a mistake that can diminish flavor and growth. It's easy to assume that more nutrients mean better plants, but Washington soils often provide sufficient nutrients for parsley without additional fertilizers.
- Finally, some people neglect the importance of proper spacing between parsley plants. Crowding them can lead to poor air circulation and increase the risk of fungal diseases, especially in Washington's humid summers.
Frequently Asked Questions
What if I'm in a cold pocket of Washington?
If you're in a colder area, consider starting your parsley seeds indoors earlier than recommended. Keep an eye on local frost dates to determine the best time for transplanting outdoors to avoid late frost damage.
Can I still plant parsley in May?
Yes, you can plant parsley in May, especially in Zone 5b where the last frost date is May 6. However, keep in mind that planting later may yield a shorter harvest season, so try to start earlier next year.
How do I keep my parsley from bolting?
To prevent bolting, regularly harvest your parsley and ensure consistent watering. Bolting often occurs due to stress factors like heat and dryness, so maintaining ideal conditions will help prolong the leaf-producing phase.
Can I grow parsley in a container?
Absolutely! Parsley grows well in containers on patios or balconies. Use a pot that's at least 10-12 inches wide with drainage to ensure healthy growth, and you can even move it indoors before fall frosts arrive.
What should I do if my parsley is wilting?
If your parsley is wilting, check the soil moisture first. Overwatering or underwatering can both cause wilting. Adjust your watering regimen accordingly and ensure your plant is receiving enough sunlight for healthy growth.
Keep Learning
City guides in Washington
Other crops in Washington
Typical fall sowing window for Parsley in Washington: July 19 – August 9.