When to Plant Scallions in Oregon (2026 Guide)
If you're keen to grow scallions in Oregon, you're in for a treat. These versatile vegetables are adaptable and perfect for a home garden. Depending on your location within the state, your planting and harvesting times can vary significantly due to the different USDA hardiness zones. For example, in Beaverton, the last spring frost typically occurs around April 11, giving you ample time to get your scallions started this season.
Scallions, also known as green onions or bunching onions, can be sown directly into your garden or even in containers for those with limited space. They generally take about 60 to 70 days to mature, providing you with a fast-growing option that allows for succession planting from early spring until late fall. From the first spring sowing, you can expect to begin harvesting around early June, extending your culinary adventures straight through till the frost hits around October 31.
Knowing your local frost dates is crucial for successful gardening in Oregon. In Salem, for instance, where the last spring frost occurs around April 22, you can plan your planting schedule accordingly. By understanding the frost-free growing season—about 183 days in Salem versus 237 days in Gresham—you can maximize your scallion harvest while taking advantage of the Oregon climate.
Planting Schedule by USDA Zone in Oregon
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 6b | Start February 15 – March 1, ~6–8 weeks before April 11 | Transplant outdoors April 25 – May 1, after last spring frost | Direct sow April 25 – May 15, post-frost window | Harvest from June 11 until October 31 |
| Zone 6a | Start March 1 – March 15, ~6–8 weeks before April 22 | Transplant outdoors May 1 – May 5, after last spring frost | Direct sow May 1 – May 15, after frost window | Harvest from June 11 until October 22 |
| Zone 7a | Start February 15 – March 1, ~6–8 weeks before March 23 | Transplant outdoors April 10 – April 15, after last frost | Direct sow April 10 – April 20, after frost date | Harvest from May 25 until November 15 |
Scallions Planting Windows in Oregon
- Indoor start: For optimal results, start your scallion seeds indoors between February 15 and March 1.
- Transplant outdoors: Once the last spring frost has passed, transplant your scallions outdoors from April 25 to May 5.
- Harvest: You can anticipate harvesting your scallions from June 11 up until October 31.
Common Mistakes Growing Scallions in Oregon
- One common mistake many Oregon gardeners make is planting scallions too early in crowded beds. It's critical to pay attention to the late arrival of spring frosts, particularly if you're in areas like Portland, where April can still surprise you with chills.
- Overwatering is another frequent error in Oregon's varied climate. With frequent rains, especially in spring, it’s essential to check your soil moisture levels. Scallions prefer well-drained soil and should not sit in water, which can lead to root rot
- Many novice gardeners in Oregon believe they can overlook succession planting. Given the state's diverse climate, rather than planting a large batch at once, sow scallions every 3–4 weeks to ensure a steady supply.
- Another oversight is in-understanding the temperature tolerance of scallions. While they can handle light frosts, planting them even after mid-May in southern Oregon can lead to heat stress and reduced quality during hot summer months.
- Improper spacing can also lead to poor growth. In a state with fertile soil, Oregon gardeners may be tempted to pack scallions too close together. They thrive when given room to grow, so be sure to follow the recommended spacing for your variety.
Frequently Asked Questions
Can I still plant scallions in May?
Yes, you can still plant scallions in May, especially if you’re in a warmer area. Just ensure you direct sow them by May 15, or better yet, transplant stronger starts to avoid any issues with late spring frosts.
What if I live in a colder pocket of Oregon?
If you're in a cooler microclimate, like those around the coastal mountains, it’s advisable to start your scallions indoors earlier to give them a good head start before transplanting them outside.
How can I regrow scallions after harvesting?
After trimming scallions for a meal, leave about 1-2 inches of the white base with roots intact. You can then replant it in moist soil or place it in water to grow new green shoots quickly, offering a fresh supply right in your kitchen.
Do scallions need full sun?
Scallions thrive in full sun but can tolerate partial shade. In the hotter months, some afternoon shade can help them grow stronger and prevent bolting. Aim for at least 6 hours of sunlight for healthy growth.
Can scallions tolerate light frost?
Yes, scallions are quite hardy and can tolerate light frost down to about 28°F. If freezing temperatures are expected, consider covering them with row covers to shield from damage and extend your harvest.
Keep Learning
City guides in Oregon
Other crops in Oregon
Typical fall sowing window for Scallions in Oregon: August 16 – September 6.