Growing swiss chard in zone 6
Unlike spinach and lettuce, chard tolerates heat — one spring planting can produce until hard frost if you keep picking outer stalks. Each "seed" is a cluster, so thin seedlings early.
Zone 6 covers mid-Atlantic, Ohio Valley, Kansas, inland Pacific Northwest — nearly 200 frost-free days — almost everything grows, and fall gardens are easy. Zone dates are medians: frost timing varies within a zone with elevation and terrain, so treat these windows as a solid default and refine them with your own city’s dates below.
Make it local
These windows use zone 6's typical frost dates (last frost ~Apr 10, first frost ~Oct 22). For windows computed from your frost dates, run the ZIP code frost lookup and open the planting calendar — it remembers your city. The seed starting scheduler turns the whole seed rack into one printable, date-sorted list.
Frequently asked questions
When do I plant swiss chard in zone 6?
Transplant Mar 27 – Apr 10, counted from zone 6's typical last frost around Apr 10. It handles a light frost but not a hard freeze, so watch the forecast early in the window.
When should I start seeds indoors for swiss chard in zone 6?
Sow indoors Mar 6 – Mar 20 — that's 5 to 3 weeks before the typical Apr 10 last frost, giving sturdy transplants exactly when the garden is ready for them.
Can I direct sow swiss chard in zone 6?
Yes — direct sow Mar 27 – Apr 10. Transplants buy a head start, but direct-sown plants catch up quickly once soil warms.
Can I plant swiss chard for a fall harvest in zone 6?
Yes — sow Aug 13 – Aug 27, counted back from the typical Oct 22 first frost so plants mature before serious cold. Time it so harvest wraps up before the first frost.