When to plant Celery in Delaware
In spring, from Mar 15 – Apr 15 in Dover to Apr 1 – 20 in Wilmington.
In fall, June 15 – Aug 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 |
|---|---|---|
| Dover | Mar 15 – Apr 15 | June 15 – Aug 15 |
| Middletown | Apr 1 – 20 | June 15 – Aug 15 |
| Milford | Apr 1 – 20 | June 15 – Aug 15 |
| Newark | Apr 1 – 20 | June 15 – Aug 15 |
| Smyrna | Mar 15 – Apr 15 | June 15 – Aug 15 |
| Wilmington | Apr 1 – 20 | June 15 – Aug 15 |
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 celery and celeriac.