When to plant Onions in Missouri
In spring, from Feb 15 – Mar 15 in Ballwin to Mar 15 – Apr 10 in West Plains.
In fall, Sept 1 – Oct 15.
Dates are for setting out plants. USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.
| Place | Spring | Fall |
|---|---|---|
| Arnold | Mar 1 – Apr 1 | Not listed |
| Ballwin | Feb 15 – Mar 15 | Not listed |
| Bellefontaine Neighbors | Feb 15 – Mar 15 | Not listed |
| Belton | Mar 1 – Apr 1 | Not listed |
| Blue Springs | Mar 1 – Apr 1 | Not listed |
| Bolivar | Mar 1 – Apr 1 | Spring-planted |
| Branson | Mar 1 – Apr 1 | Not listed |
| Bridgeton | Feb 15 – Mar 15 | Not listed |
| Cape Girardeau | Mar 1 – Apr 1 | Spring-planted |
| Carthage | Feb 15 – Mar 15 | Not listed |
| Chesterfield | Feb 15 – Mar 15 | Not listed |
| Clayton | Feb 15 – Mar 15 | Not listed |
| Columbia | Mar 1 – Apr 1 | Not listed |
| Crestwood | Feb 15 – Mar 15 | Not listed |
| Creve Coeur | Feb 15 – Mar 15 | Not listed |
| Dardenne Prairie | Mar 1 – Apr 1 | Not listed |
| Ellisville | Mar 1 – Apr 1 | Spring-planted |
| Eureka | Mar 1 – Apr 1 | Spring-planted |
| Excelsior Springs | Mar 15 – Apr 10 | Spring-planted |
| Farmington | Mar 1 – Apr 1 | Spring-planted |
| Ferguson | Feb 15 – Mar 15 | Not listed |
| Festus | Mar 1 – Apr 1 | Not listed |
| Florissant | Feb 15 – Mar 15 | Not listed |
| Fulton | Mar 1 – Apr 1 | Spring-planted |
| Gladstone | Feb 15 – Mar 15 | Not listed |
| Grain Valley | Mar 1 – Apr 1 | Not listed |
| Grandview | Mar 1 – Apr 1 | Not listed |
| Hannibal | Mar 1 – Apr 1 | Not listed |
| Hazelwood | Feb 15 – Mar 15 | Not listed |
| Independence | Mar 1 – Apr 1 | Not listed |
| Jackson | Mar 1 – Apr 1 | Not listed |
| Jefferson City | Mar 1 – Apr 1 | Not listed |
| Jennings | Feb 15 – Mar 15 | Not listed |
| Joplin | Mar 1 – Apr 1 | Not listed |
| Kansas City | Feb 15 – Mar 15 | Not listed |
| Kearney | Mar 15 – Apr 10 | Spring-planted |
| Kennett | Feb 15 – Mar 15 | Not listed |
| Kirksville | Mar 15 – Apr 10 | Spring-planted |
| Kirkwood | Feb 15 – Mar 15 | Not listed |
| Lake St. Louis | Mar 1 – Apr 1 | Not listed |
| Lebanon | Mar 15 – Apr 10 | Spring-planted |
| Lee's Summit | Mar 1 – Apr 1 | Not listed |
| Liberty | Mar 15 – Apr 10 | Spring-planted |
| Manchester | Feb 15 – Mar 15 | Not listed |
| Marshall | Mar 1 – Apr 1 | Spring-planted |
| Maryland Heights | Feb 15 – Mar 15 | Not listed |
| Maryville | Mar 15 – Apr 10 | Spring-planted |
| Mexico | Mar 1 – Apr 1 | Spring-planted |
| Moberly | Mar 1 – Apr 1 | Spring-planted |
| Monett | Mar 1 – Apr 1 | Not listed |
| Neosho | Mar 1 – Apr 1 | Not listed |
| Nixa | Mar 1 – Apr 1 | Spring-planted |
| O'Fallon | Mar 1 – Apr 1 | Not listed |
| Overland | Feb 15 – Mar 15 | Not listed |
| Ozark | Mar 1 – Apr 1 | Spring-planted |
| Poplar Bluff | Feb 15 – Mar 15 | Sept 1 – Oct 15 |
| Raymore | Mar 1 – Apr 1 | Not listed |
| Raytown | Mar 1 – Apr 1 | Not listed |
| Republic | Mar 1 – Apr 1 | Not listed |
| Rolla | Mar 1 – Apr 1 | Not listed |
| Sedalia | Mar 15 – Apr 10 | Spring-planted |
| Sikeston | Feb 15 – Mar 15 | Sept 1 – Oct 15 |
| Smithville | Mar 15 – Apr 10 | Spring-planted |
| Springfield | Feb 15 – Mar 15 | Not listed |
| St. Ann | Feb 15 – Mar 15 | Not listed |
| St. Charles | Mar 1 – Apr 1 | Not listed |
| St. Joseph | Mar 15 – Apr 10 | Spring-planted |
| St. Louis | Feb 15 – Mar 15 | Not listed |
| St. Peters | Mar 1 – Apr 1 | Not listed |
| Town and Country | Feb 15 – Mar 15 | Not listed |
| Troy | Mar 1 – Apr 1 | Spring-planted |
| Union | Mar 1 – Apr 1 | Spring-planted |
| University City | Feb 15 – Mar 15 | Not listed |
| Warrensburg | Mar 1 – Apr 1 | Spring-planted |
| Washington | Mar 1 – Apr 1 | Spring-planted |
| Webb City | Mar 1 – Apr 1 | Not listed |
| Webster Groves | Feb 15 – Mar 15 | Not listed |
| Wentzville | Mar 1 – Apr 1 | Not listed |
| West Plains | Mar 15 – Apr 10 | Spring-planted |
| Wildwood | Mar 1 – Apr 1 | Spring-planted |
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. “—” means the place's frost date is outside the table. The full USDA table for onion plants.