When to plant onion in Texas
Texas spans USDA zones 7a–10a, so the right time to plant onion shifts by weeks across the state. The window to transplant seedlings outdoors runs from about December 11 in Edinburg to March 24 in Dumas — below are local dates for 267 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Houston | 9b | February 2 | December 25 | January 5 – January 19 |
| San Antonio | 9a | February 25 | November 28 | January 28 – February 11 |
| Dallas | 8b | March 2 | November 29 | February 2 – February 16 |
| Austin | 9a | February 20 | December 3 | January 23 – February 6 |
| Fort Worth | 8b | March 5 | November 24 | February 5 – February 19 |
| El Paso | 8b | March 2 | November 20 | February 2 – February 16 |
| Arlington | 8b | March 9 | November 21 | February 9 – February 23 |
| Corpus Christi | 10a | January 22 | January 4 | December 25 – January 8 |
Onion in Texas: FAQ
When can I plant onion in Texas?
Across Texas, the time to transplant onion spans roughly December 11 in Edinburg to March 24 in Dumas, each following that city's local frost dates.
Does the onion planting date vary across Texas?
Yes. Texas publishes 267 cities with their own frost dates, so the right onion 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 onion take to grow in Texas?
Onion takes about 90–110 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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