When to plant swiss chard in Minnesota
Minnesota’s average last spring frost is May 6, and the first fall frost typically arrives around September 28 — about 145 frost-free days (USDA zones 3a, 3b, 4a, 4b, 5a). Swiss Chard needs 50–60 days to mature, which fits comfortably within Minnesota's growing season.
When to plant swiss chard in Minnesota: the short answer
For a spring planting, plant out Apr 15 – May 2, with seeds started indoors Apr 1 – Apr 15. Seeds germinate in soil from 40 to 85°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 swiss chard in Minnesota, step by step
- Start seeds indoors (Apr 1 – Apr 15). Sow seeds 0.75 inch deep in seed-starting mix under bright light. They take 5-14 days to sprout, fastest in soil around 70°F. Harden seedlings off for a week before they go outside.
- Prepare the bed. It needs six or more hours of sun for the best growth, though four to six hours in partial shade is enough and loose soil at least 12 inches deep, with a pH between 6.0 and 7.5. Dig in compost before planting.
- Plant out (Apr 15 – May 2). Space plants about 9 inches apart in rows 18 inches apart. It tolerates a light frost but not a hard freeze. As a cool-season crop it does best before summer heat arrives in Minnesota.
- 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: leaf miner, aphids, flea beetle. Diseases and disorders: cercospora leaf spot, downy mildew.
- Harvest (from about Jun 11 – Jun 21). Swiss Chard takes 50-60 days to reach harvest. One of the most heat-tolerant leafy greens - a single spring sowing usually carries through summer into fall if kept picked.
Figures come from our crop data; dates use Minnesota’s average frost dates. More in the full swiss chard growing guide.
Swiss Chard planting dates by USDA zone in Minnesota
Minnesota spans USDA zones 3a, 3b, 4a, 4b, 5a. 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 swiss chard dates shift with them.
When to plant swiss chard in nearby states
Questions gardeners in Minnesota ask
When is the best time to plant swiss chard in Minnesota?
Plant swiss chard transplants outdoors in Minnesota between April 15 and May 2. That timing is set by Minnesota's average last spring frost of May 6.
When should I start swiss chard seeds indoors in Minnesota?
Start seeds indoors between April 1 and April 15, about 4 weeks before the last frost, so the seedlings are ready to plant out from April 15.
Can I plant swiss chard in the fall in Minnesota?
Yes. For a fall crop, sow between July 10 and July 27, so the crop matures in cool weather before Minnesota's first frost around September 28.
When will swiss chard planted in Minnesota be ready to harvest?
Planted on time, swiss chard is usually ready from about June 11 to June 21, 50-60 days after planting.
When is the last frost in Minnesota?
On average around May 6, with the first fall frost around September 28 - about 145 frost-free days. Your town may differ by two weeks or more.