When to plant potatoes in Michigan
Michigan’s average last spring frost is May 10, and the first fall frost typically arrives around October 5 — about 148 frost-free days (USDA zones 4a, 4b, 5a, 5b, 6a, 6b). Potato needs 70–120 days to mature, which fits comfortably within Michigan's growing season.
Michigan covers a wide range of climates, so your exact frost dates may differ from the state average by two weeks or more. For dates tuned to your town, use the calendar generator.
When to plant potatoes in Michigan: the short answer
For a spring planting, sow Apr 21 – May 10. Seeds germinate in soil from 45 to 80°F.
Windows are ~1–2 week bands around each date. Frost dates are a statewide average from NOAA/NCEI normals; your town may differ by two weeks or more. Calendar year 2026.
How to grow potatoes in Michigan, step by step
- Prepare the bed. They need at least six to eight hours of direct sun a day and loose soil at least 18 inches deep, with a pH between 4.8 and 6.5. Dig in compost before planting.
- Sow outdoors (Apr 21 – May 10). Space plants about 12 inches apart in rows 32 inches apart, sowing seed 4 inches deep. It tolerates a light frost but not a hard freeze. As a cool-season crop it does best before summer heat arrives in Michigan.
- Water and feed. Give it steady, even moisture, about an inch of water a week from rain or the hose.
- Watch for pests and problems. Pests: Colorado potato beetle, flea beetle, wireworm, aphids. Diseases and disorders: late blight, early blight, common scab, blackleg.
- Harvest (from about Jul 5 – Aug 24). Potato takes 70-120 days to reach harvest. Plant certified seed potatoes, not grocery-store ones. Hill soil or mulch over the stems as they grow to stop greening. New potatoes ~10 weeks in; storage potatoes after the tops die back.
Figures come from our crop data; dates use Michigan’s average frost dates. More in the full potato growing guide.
Potato planting dates by USDA zone in Michigan
Michigan spans USDA zones 4a, 4b, 5a, 5b, 6a, 6b. Colder zones, usually higher or further inland, have a later last spring frost and an earlier first fall frost than the state average, so the potato dates shift with them.
When to plant potatoes in nearby states
Questions gardeners in Michigan ask
When is the best time to plant potatoes in Michigan?
Sow potatoes in Michigan between April 21 and May 10. That timing is set by Michigan's average last spring frost of May 10; Michigan spans several climates, so cooler and higher parts of the state run later.
When will potatoes planted in Michigan be ready to harvest?
Planted on time, potatoes are usually ready from about July 5 to August 24, 70-120 days after sowing.
When is the last frost in Michigan?
On average around May 10, with the first fall frost around October 5 - about 148 frost-free days. Your town may differ by two weeks or more.