When to Plant Scallions in Shiawassee County, MI
Scallions (green onions) are mild-flavored alliums harvested for their slender green tops and white bases. They are quick-growing and perfect for succession planting.
Shiawassee County, Michigan is in USDA Zone 5b. The average last spring frost is April 29 and the first fall frost is October 14, giving you a growing season of approximately 168 days.
At an elevation of 803 feet, Shiawassee County receives approximately 30.8 inches of rainfall annually with predominantly silt loam soil. Summer highs average 87°F, providing good warmth for Scallions during the growing season.
Shiawassee County Soil Profile
Soil Type
Silt Loam
Soil pH
5.7-6.8
Drainage
Well Drained
Plant Planting Risk Windows
Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.
Plant Water Budget
Scallions Planting Timeline — Shiawassee County, MI
Scallions Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 25 | Mar 25 – Apr 8 |
| Transplant Outdoors | April 29 | Apr 29 – May 13 |
| Direct Sow | April 15 | Apr 15 – May 6 |
| Fall Sowing | August 5 | Aug 5 – Aug 19 |
| Harvest | June 24 | Jun 24 – Jul 22 |
Plant 0.5" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors |
| April | Start Indoors Transplant Outdoors Direct Sow |
| May | Transplant Outdoors Direct Sow |
| June | Harvest |
| July | Harvest |
| August | Fall Sowing |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
Sun
Full Sun (6-8+ hours)
Water
Moderate — regular watering
Days to Maturity
50–70 days
Soil pH
6 – 7
USDA Zone
Zone 5b
Growing Season
168 days
Growing Tips for Shiawassee County
Direct sow every 3 weeks for continuous harvest. Thin to 1 inch apart or grow in clusters. Harvest when pencil-thick by pulling or cutting at soil level.
Companion Planting
Good Companions
Avoid Planting Near
Level Up Your Garden
Scallions in Other Locations
Frequently Asked Questions
When should I plant Scallions in Shiawassee County, MI?
Shiawassee County is in Zone 5b with an average last frost of April 29. Plan your Scallions planting based on this frost date — see the calendar above for exact timing.
What planting zone is Shiawassee County, MI?
Shiawassee County, Michigan is in USDA Hardiness Zone 5b. The average last spring frost is April 29 and first fall frost is October 14.
Plan Your Garden with Confidence
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