When to Plant Scallions in Washington (2026 Guide)
Growing scallions in Washington can be a rewarding endeavor for gardeners looking to add fresh flavor to their meals. Known for their versatility, scallions can be harvested in just 60–70 days, making them a favorite for many. With the average last spring frost typically occurring by April 9 in some areas, gardeners have a prime opportunity to start planning their scallion crops early in the season.
The key to successful scallion cultivation lies in understanding the local climate and frost dates. For instance, gardeners in Eastern Washington have different timing needs compared to those on the coast. With a potentially long frost-free season ranging from ~150 to ~200 days across the state, knowing when to start your seeds and when to transplant outdoors is crucial for maximizing your harvest.
In Washington, the growing season allows for continuous harvesting by sowing seeds every 3–4 weeks. The first frost usually arrives around October 3, giving gardeners plenty of time to enjoy this flavorful crop from spring through fall. Whether you’re a seasoned gardener in Seattle or a novice in Spokane, this guide will help you navigate the best practices for growing and harvesting scallions.
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 from April 10 – April 20 | Direct sow from April 10 – May 15 | Harvest between June 1 – October 26 |
| Zone 6a | Start February 20 – March 5, ~6–8 weeks before April 20 | Transplant outdoors from April 21 – May 1 | Direct sow from April 21 – May 20 | Harvest between June 10 – October 19 |
| Zone 5b | Start March 1 – March 15, ~6–8 weeks before May 6 | Transplant outdoors from May 7 – May 15 | Direct sow from May 7 – June 1 | Harvest between June 20 – October 3 |
Scallions Planting Windows in Washington
- Indoor start: Start scallion seeds indoors from February 15 to March 15, depending on your zone's frost dates.
- Transplant outdoors: Transplant scallions outdoors from April 10 to May 15, ensuring the danger of frost has passed.
- Harvest: Scallions are typically harvested from June 1 through October 3, before the first frost impacts your crop.
Common Mistakes Growing Scallions in Washington
- One common mistake in Washington is planting scallions too late in the season. Attention to the last frost dates is essential; late frosts can occur well into May in some areas, jeopardizing your crop's survival.
- Many people tend to overcrowd their scallion plantings, thinking more is better. Washington's varied climates need adequate spacing to allow air circulation. Crowding can lead to diseases that diminish yields and make harvesting difficult.
- Not paying attention to soil quality is another mistake. Washington’s soils can vary significantly; some areas have clay soil which can hinder growth. Make sure to amend your soil with organic matter for better drainage and nutrient availability.
- Another issue arises when gardeners overwater their scallions. In parts of Washington, the humidity can lead to root rot if your scallions don’t have good drainage. It’s important to let the soil dry slightly between waterings for healthy growth.
- Some gardeners in Washington attempt to grow scallions in the hottest part of summer, ignoring their cooler weather preference. Scallions thrive in cooler temperatures, and planting them during hot spells risks stunted growth and flavor loss.
Frequently Asked Questions
What if I'm in a cold pocket of Washington?
If you're in a colder area, like parts of Eastern Washington, consider starting your seeds indoors. This approach provides you with a head start before transplanting them outside when conditions improve.
Can I still plant scallions in May?
Yes, planting scallions in May is feasible, particularly in Zones 6a and 5b. Just be aware of your area's frost dates to avoid planting too close to the first fall frost.
How long will scallions last in my garden?
Scallions can be harvested continuously throughout the summer until the first frost, with timely sowing and good garden care extending their life. Regular watering and pest management will help them thrive.
What should I do if my scallions don't sprout?
If scallions aren't sprouting, check soil moisture and temperature. Ensure they have been planted at a proper depth in well-draining soil, and consider moving them to a sunnier location if they are in shade.
Are scallions resistant to frost damage?
Scallions can tolerate light frosts fairly well, surviving temperatures down to 28°F. However, prolonged frost can damage them, so cover them if temperatures drop significantly.
Keep Learning
City guides in Washington
Other crops in Washington
Typical fall sowing window for Scallions in Washington: August 12 – September 2.