When to Plant Scallions in Illinois (2026 Guide)
If you’re considering adding scallions to your Illinois garden, you’re making a fantastic choice. These crops, also known as green onions or bunching onions, are not only versatile but also extremely productive. With a growth time of just 60–70 days from seed, they can be planted in succession to ensure a near-continuous supply from early summer through the fall.
Understanding your local climate is essential for optimal harvests. In Illinois, the frost dates vary significantly by zone, impacting when you should start growing these delicious vegetables. For example, areas in Zone 6a experience their last spring frost around April 26, while Zone 5b can see it as late as May 3. This information is crucial for planning your sowing schedule.
As you delve into gardening scallions, remember that they thrive in cool weather and can withstand light frosts down to 28°F. Whether you are in Chicago or Aurora, having a well-structured planting schedule will maximize your yield. This guide will help you navigate the complexities of growing scallions in different parts of Illinois.
Planting Schedule by USDA Zone in Illinois
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 6a | Start March 15 – April 1, ~6–8 weeks before April 26 | Transplant outdoors April 15 – May 1, after the last frost | Direct sow from April 15 – July 1, after the last frost | Harvest from June 1 – October 1 |
| Zone 6b | Start March 1 – March 15, ~6–8 weeks before April 13 | Transplant outdoors April 1 – April 15, after the last frost | Direct sow from April 1 – July 1, after the last frost | Harvest from June 1 – October 16 |
| Zone 5b | Start March 15 – April 1, ~6–8 weeks before May 3 | Transplant outdoors April 20 – May 10, after the last frost | Direct sow from April 20 – July 1, after the last frost | Harvest from June 10 – October 8 |
Scallions Planting Windows in Illinois
- Indoor start: Begin indoor seed starting from March 1 to April 1, depending on your zone.
- Transplant outdoors: You can transplant scallion seedlings outdoors from April 1 to May 10 in Illinois, ensuring you're past the risk of last frosts.
- Harvest: Scallions can be harvested from June 1 through October 16, depending on your planting method and local conditions.
Common Mistakes Growing Scallions in Illinois
- Many Illinois gardeners underestimate the impact of humidity on scallion growth. High humidity can lead to rot if the soil isn't well-drained. Make sure to amend your soil to promote proper drainage for a successful crop.
- Another common mistake is planting scallions too late in the spring. With last frost dates extending into May for some areas in Illinois, the window for planting can be tight. Always check your local frost dates and plan accordingly.
- It's not uncommon for Illinois gardeners to plant scallions too sparsely. These crops thrive when planted densely, allowing them to grow in tight clusters. Maximizing planting density can lead to greater yields in limited spaces.
- Assuming all scallion varieties grow similarly can be a pitfall. Illinois's variable climate means that some varieties may be better suited for your specific zone. Research local varieties to choose those that can handle the specific temperature and frost conditions.
- Forgetting to cover your scallions during late fall frosts can diminish their flavor and quality. Illinois's unpredictable autumn weather makes it necessary to monitor temperatures and use row covers when temperatures drop, especially below 25°F.
Frequently Asked Questions
What if I’m in a cold pocket of Illinois?
If you find yourself in a colder pocket of Illinois, adjust your planting dates accordingly. Focus on starting seeds indoors earlier and consider using row covers to protect your seedlings from unexpected frosts.
Can I still plant scallions in May?
Yes, you can plant scallions in May, especially in Zone 6b and 6a. Just ensure that the last frost has passed for your area before you direct sow or transplant outdoors for the best results.
How can I maximize my scallion yields?
To maximize yields, practice succession planting every 3 weeks and use dense planting techniques. This increases the turnover rate of harvests and allows for continuous supply throughout the growing season.
Are scallions frost-tolerant?
Yes, scallions are quite frost-tolerant and can survive temperatures down to 28°F. If frost threatens your plants, cover them with row covers to protect and extend your harvest season.
What should I do if my scallions bolt?
If your scallions begin to bolt, it's best to harvest them immediately, as this can affect their flavor. You can also use the tops in cooking; they are edible but may not have the same texture as non-bolted plants.
Keep Learning
City guides in Illinois
Other crops in Illinois
Typical fall sowing window for Scallions in Illinois: July 27 – August 17.