When to plant swiss chard in Oklahoma
Oklahoma spans USDA zones 6b–8a, so the right time to plant swiss chard shifts by weeks across the state. The window to sow seed directly outdoors runs from about March 1 in Ardmore to April 4 in Guymon — below are local dates for 45 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Direct sow |
|---|---|---|---|---|
| Oklahoma City | 7b | April 4 | November 2 | March 21 – May 2 |
| Tulsa | 7b | March 31 | November 4 | March 17 – April 28 |
| Norman | 7b | April 3 | November 3 | March 20 – May 1 |
| Broken Arrow | 7b | April 1 | November 1 | March 18 – April 29 |
| Edmond | 7b | April 10 | October 28 | March 27 – May 8 |
| Lawton | 7b | March 26 | November 7 | March 12 – April 23 |
| Moore | 7b | March 31 | November 5 | March 17 – April 28 |
| Midwest City | 7b | April 2 | November 5 | March 19 – April 30 |
Swiss Chard in Oklahoma: FAQ
When can I plant swiss chard in Oklahoma?
Across Oklahoma, the time to direct-sow swiss chard spans roughly March 1 in Ardmore to April 4 in Guymon, each following that city's local frost dates.
Does the swiss chard planting date vary across Oklahoma?
Yes. Oklahoma publishes 45 cities with their own frost dates, so the right swiss chard planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
How long does swiss chard take to grow in Oklahoma?
Swiss Chard takes about 50–60 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.
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