When to plant watercress in Oklahoma
Oklahoma spans USDA zones 6b–8a, so the right time to plant watercress 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 – April 18 |
| Tulsa | 7b | March 31 | November 4 | March 17 – April 14 |
| Norman | 7b | April 3 | November 3 | March 20 – April 17 |
| Broken Arrow | 7b | April 1 | November 1 | March 18 – April 15 |
| Edmond | 7b | April 10 | October 28 | March 27 – April 24 |
| Lawton | 7b | March 26 | November 7 | March 12 – April 9 |
| Moore | 7b | March 31 | November 5 | March 17 – April 14 |
| Midwest City | 7b | April 2 | November 5 | March 19 – April 16 |
Watercress in Oklahoma: FAQ
When can I plant watercress in Oklahoma?
Across Oklahoma, the time to direct-sow watercress spans roughly March 1 in Ardmore to April 4 in Guymon, each following that city's local frost dates.
Does the watercress planting date vary across Oklahoma?
Yes. Oklahoma publishes 45 cities with their own frost dates, so the right watercress 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 watercress take to grow in Oklahoma?
Watercress takes about 45–60 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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