When to plant swiss chard in San Jose
Common questions
When can I sow swiss chard outdoors in San Jose?
Direct-sow around late December (Dec 25–Jan 15) in San Jose, based on its local frost dates. Confidence 80%.
When will swiss chard be ready to harvest in San Jose?
Expect to harvest from around mid February (Feb 13–Feb 23) in San Jose, based on its local frost dates. Confidence 74%.
When should I start swiss chard seeds indoors in San Jose?
Start seeds indoors around mid January (Jan 15–Feb 5) in San Jose, based on its local frost dates. Confidence 78%.
When can I transplant swiss chard outdoors in San Jose?
Transplant outdoors around late December (Dec 25–Jan 15) in San Jose, based on its local frost dates. Confidence 80%.
Can I plant swiss chard in autumn in San Jose?
Yes — San Jose supports a second, autumn sowing of swiss chard around late August (Aug 28–Sep 11), timed to mature before the first fall frost.
How long is the growing season in San Jose?
San Jose has roughly 294 frost-free days, which is enough time to grow swiss chard to maturity outdoors.
Sow swiss chard 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 San Jose's frost dates.