When to plant sunflower in Utah
Utah spans USDA zones 5b–8b, so the right time to plant sunflower shifts by weeks across the state. The window to sow seed directly outdoors runs from about March 14 in St. George to June 4 in Heber — below are local dates for 67 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Direct sow |
|---|---|---|---|---|
| Salt Lake City | 7b | March 31 | November 8 | March 31 – April 21 |
| West Valley City | 7b | April 8 | October 31 | April 8 – April 29 |
| West Jordan | 7b | April 18 | October 22 | April 18 – May 9 |
| Provo | 7a | April 18 | October 21 | April 18 – May 9 |
| St. George | 8b | March 14 | November 10 | March 14 – April 4 |
| Orem | 7a | April 19 | October 19 | April 19 – May 10 |
| Sandy | 7b | April 29 | October 22 | April 29 – May 20 |
| Ogden | 6b | April 21 | October 23 | April 21 – May 12 |
Sunflower in Utah: FAQ
When can I plant sunflower in Utah?
Across Utah, the time to direct-sow sunflower spans roughly March 14 in St. George to June 4 in Heber, each following that city's local frost dates.
Does the sunflower planting date vary across Utah?
Yes. Utah publishes 67 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 Utah?
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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