When to Plant Scallions in Michigan (2026 Guide)
Scallions, also known as green onions or bunching onions, are among the most versatile crops you can grow in Michigan. They provide a continuous harvest throughout the growing season due to their fast maturation time, usually taking only 60 to 70 days from seed to table. Understanding the right timing for planting scallions is essential, especially with Michigan's varying frost dates, which can impact your planting schedule.
In Michigan, the frost dates can vary significantly by region. For example, in Zone 6a cities like Ann Arbor, the median last spring frost date is April 26, while in Zone 5b cities like Grand Rapids, it occurs later on May 8. This means gardeners in different zones need to plan their planting and harvesting schedules accordingly to make the most of their crop yields over the season.
Successful scallion gardening means knowing when to sow seeds, whether indoors or directly outdoors, and understanding your local climate's impact on growth. For instance, scallions can be direct-sown in Michigan as early as mid-April in warmer areas, while in cooler regions, you might wait until early June to avoid frost damage. Proper timing is the first key to a successful harvest.
Planting Schedule by USDA Zone in Michigan
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 6a | Start seeds indoors from February 15 – March 1, ~6–8 weeks before April 26 | Transplant seedlings outdoors starting April 27 – May 10 after the last frost | Direct sow seeds outdoors from April 26 – May 20 | Harvest scallions from June 26 through October 17 |
| Zone 5b | Start seeds indoors from March 1 – March 15, ~6–8 weeks before May 8 | Transplant seedlings outdoors starting May 9 – May 15 after the last frost | Direct sow seeds outdoors from May 8 – June 1 | Harvest scallions from July 7 through October 6 |
| Zone 5a | Start seeds indoors from March 15 – March 30, ~6–8 weeks before May 30 | Transplant seedlings outdoors starting May 31 – June 10 after the last frost | Direct sow seeds outdoors from May 30 – June 15 | Harvest scallions from July 29 through September 23 |
Scallions Planting Windows in Michigan
- Indoor start: For Michigan gardeners, the ideal window to start seeds indoors is from mid-February to early March, giving seedlings enough time to establish before being transplanted outside.
- Transplant outdoors: Transplanting scallion seedlings outdoors should occur between late April and mid-May in warmer areas, while in cooler regions, aim for late May to early June.
- Harvest: Scallions can be harvested from mid-June through mid-October, depending on the zone, allowing for teenaged plants that withstand some autumn chill.
Common Mistakes Growing Scallions in Michigan
- One common mistake is planting scallions too early in Michigan's frost-prone regions, leading to frost damage. Be sure to adhere to local frost dates to avoid losing your plants during unexpected cold snaps.
- Overcrowding is another mistake; many gardeners underestimate how much space scallions need to thrive. Remember to thin your sowings to promote healthy growth and ensure they have enough room for their roots to expand.
- Many Michigan gardeners forget to succession-sow their scallions for a continuous harvest. Planting all seeds at once may lead to a large gap in production, so aim for new seedlings every few weeks for ongoing supplies.
- Ignoring soil conditions can be detrimental—Michigan soils vary, and some areas may have high clay content or alkaline levels. Conducting a soil test can help you understand your nutrient needs and prevent inadequate growth for your scallions.
- Lastly, be cautious of late spring snowstorms that can occur in Michigan, resulting in frost damage even after the average last frost date. Always have some protection on standby, like row covers, to shield your crops from unexpected weather.
Frequently Asked Questions
What if I'm in a cold pocket of Michigan?
If you're located in a colder region of Michigan, make sure to adjust your planting dates accordingly. Start seeds indoors earlier and use protective coverings to shield seedlings from late frosts. Always pay attention to local weather patterns.
Can I still plant scallions in May?
Yes, you can plant scallions in May, especially in areas with a last frost date of May 8. However, ensure that temperatures are consistently warm before sowing outdoors to avoid frost damage.
How much space do scallions need?
Scallions can be planted relatively closely together, about 1-2 inches apart. However, for optimal growth, ensure they have enough space to develop their roots and thin as necessary to promote health and productivity.
Can scallions survive light frost?
Yes, scallions are hardy and can tolerate light frost conditions. They can survive temperatures down to 28°F with minimal damage, making them a great choice for Michigan's fluctuating temperatures in spring and fall.
How do I extend my scallion harvest?
To extend your scallion harvest, practice succession planting every 3 to 4 weeks throughout the season. Additionally, consider replanting the white base of scallions you purchase or harvest to encourage new growth.
Keep Learning
City guides in Michigan
Other crops in Michigan
Typical fall sowing window for Scallions in Michigan: July 27 – August 17.