When to plant sunflower in Oklahoma
Oklahoma spans USDA zones 6b–8a, so the right time to plant sunflower shifts by weeks across the state. The window to sow seed directly outdoors runs from about March 15 in Ardmore to April 18 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 | April 4 – April 25 |
| Tulsa | 7b | March 31 | November 4 | March 31 – April 21 |
| Norman | 7b | April 3 | November 3 | April 3 – April 24 |
| Broken Arrow | 7b | April 1 | November 1 | April 1 – April 22 |
| Edmond | 7b | April 10 | October 28 | April 10 – May 1 |
| Lawton | 7b | March 26 | November 7 | March 26 – April 16 |
| Moore | 7b | March 31 | November 5 | March 31 – April 21 |
| Midwest City | 7b | April 2 | November 5 | April 2 – April 23 |
Sunflower in Oklahoma: FAQ
When can I plant sunflower in Oklahoma?
Across Oklahoma, the time to direct-sow sunflower spans roughly March 15 in Ardmore to April 18 in Guymon, each following that city's local frost dates.
Does the sunflower planting date vary across Oklahoma?
Yes. Oklahoma publishes 45 cities with their own frost dates, so the right sunflower 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 sunflower take to grow in Oklahoma?
Sunflower takes about 70–100 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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