When to plant Onions in Maryland
In spring, from Feb 10 – Mar 10 in Baltimore to Mar 15 – Apr 10 in Westminster.
In fall, from Sept 1 – Oct 15 in Annapolis to Oct 1 – Dec 31 in Baltimore.
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 |
|---|---|---|
| Aberdeen | Mar 1 – Apr 1 | Not listed |
| Annapolis | Feb 15 – Mar 15 | Sept 1 – Oct 15 |
| Baltimore | Feb 10 – Mar 10 | Oct 1 – Dec 31Now |
| Bel Air | Mar 1 – Apr 1 | Not listed |
| Bowie | Mar 15 – Apr 10 | Spring-planted |
| Cambridge | Feb 15 – Mar 15 | Sept 1 – Oct 15 |
| College Park | Mar 1 – Apr 1 | Not listed |
| Cumberland | Mar 1 – Apr 1 | Spring-planted |
| Easton | Feb 15 – Mar 15 | Sept 1 – Oct 15 |
| Elkton | Mar 1 – Apr 1 | Not listed |
| Frederick | Feb 15 – Mar 15 | Sept 1 – Oct 15 |
| Gaithersburg | Feb 15 – Mar 15 | Sept 1 – Oct 15 |
| Greenbelt | Mar 1 – Apr 1 | Not listed |
| Hagerstown | Mar 1 – Apr 1 | Not listed |
| Havre de Grace | Mar 1 – Apr 1 | Not listed |
| Hyattsville | Feb 15 – Mar 15 | Sept 1 – Oct 15 |
| La Plata | Mar 15 – Apr 10 | Not listed |
| Laurel | Mar 1 – Apr 1 | Sept 1 – Oct 15 |
| New Carrollton | Mar 15 – Apr 10 | Spring-planted |
| Rockville | Feb 15 – Mar 15 | Sept 1 – Oct 15 |
| Salisbury | Feb 15 – Mar 15 | Sept 1 – Oct 15 |
| Takoma Park | Feb 15 – Mar 15 | Sept 1 – Oct 15 |
| Westminster | Mar 15 – Apr 10 | 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.