When to plant kale in Boston
Common questions
When can I sow kale outdoors in Boston?
Direct-sow around early April (Apr 5–Apr 26) in Boston, based on its local frost dates. Confidence 86%.
When will kale be ready to harvest in Boston?
Expect to harvest from around late May (May 30–Jun 19) in Boston, based on its local frost dates. Confidence 80%.
When should I start kale seeds indoors in Boston?
Start seeds indoors around late February (Feb 21–Mar 14) in Boston, based on its local frost dates. Confidence 85%.
When can I transplant kale outdoors in Boston?
Transplant outdoors around early April (Apr 5–Apr 26) in Boston, based on its local frost dates. Confidence 86%.
Can I plant kale in autumn in Boston?
Yes — Boston supports a second, autumn sowing of kale around early August (Aug 5–Aug 19), timed to mature before the first fall frost.
How long is the growing season in Boston?
Boston has roughly 220 frost-free days, which is enough time to grow kale to maturity outdoors.
Sow kale as soon as the soil is workable — it tolerates cool weather and light frost. Every date on this page is derived from that rule and Boston's frost dates.