When to Plant Sweet Corn in Maryland
In Maryland, the time to sow sweet corn outside runs from Mar 31 – Apr 14 in Baltimore to May 6 – May 20 in Frostburg. In Baltimore, it's Mar 31 – Apr 14. The average last spring frost differs by about 5 weeks across the state (Mar 24 in Baltimore, Apr 29 in Frostburg), so use the dates for the town nearest you.
Sow corn in blocks rather than single rows so it pollinates well. Wait for soil around 60°F.
- Sow outside: 1–3 weeks after the last frost.
Sweet Corn planting dates in Maryland by city
| City | Zone | Sow outside |
|---|---|---|
| Aberdeen | 7b | Apr 17 – May 1 |
| Annapolis | 8a | Apr 3 – Apr 17 |
| Baltimore | 8a | Mar 31 – Apr 14 |
| Bel Air | 7b | Apr 17 – May 1 |
| Bladensburg | 7b | Apr 5 – Apr 19 |
| Bowie | 7a | Apr 29 – May 13 |
| Brunswick | 7a | May 3 – May 17 |
| Cambridge | 8a | Apr 8 – Apr 22 |
| Chesapeake Beach | 8a | Apr 16 – Apr 30 |
| Cheverly | 7b | Apr 5 – Apr 19 |
| College Park | 7b | Apr 17 – May 1 |
| Cumberland | 7a | Apr 22 – May 6 |
| District Heights | 7b | Apr 5 – Apr 19 |
| Easton | 8a | Apr 8 – Apr 22 |
| Elkton | 7b | Apr 14 – Apr 28 |
| Frederick | 7b | Apr 9 – Apr 23 |
| Frostburg | 6b | May 6 – May 20 |
| Fruitland | 7b | Apr 10 – Apr 24 |
| Gaithersburg | 7b | Apr 8 – Apr 22 |
| Glenarden | 7b | Apr 29 – May 13 |
| Greenbelt | 7b | Apr 17 – May 1 |
| Hagerstown | 7a | Apr 18 – May 2 |
| Hampstead | 7a | Apr 26 – May 10 |
| Havre de Grace | 7b | Apr 17 – May 1 |
| Hyattsville | 7b | Apr 5 – Apr 19 |
| La Plata | 7b | Apr 24 – May 8 |
| Laurel | 7b | Apr 12 – Apr 26 |
| Mount Airy | 7a | Apr 21 – May 5 |
| Mount Rainier | 7b | Apr 5 – Apr 19 |
| New Carrollton | 7b | Apr 29 – May 13 |
| Ocean City | 8a | Apr 14 – Apr 28 |
| Poolesville | 7b | Apr 20 – May 4 |
| Riverdale Park | 7b | Apr 5 – Apr 19 |
| Rockville | 7b | Apr 8 – Apr 22 |
| Salisbury | 7b | Apr 10 – Apr 24 |
| Takoma Park | 7b | Apr 5 – Apr 19 |
| Taneytown | 7a | Apr 29 – May 13 |
| Thurmont | 7a | Apr 21 – May 5 |
| Walkersville | 7a | Apr 9 – Apr 23 |
| Westminster | 7a | May 1 – May 15 |
Calculated from each town's average (50%) frost dates, from the nearest NOAA station (1991–2020). Typical dates for the 2027 planting season, based on NOAA's 1991–2020 averages. They are long-term odds, not a forecast: always check your local forecast before planting. Zones: 2023 USDA Plant Hardiness Zone Map (USDA-ARS and Oregon State University). Not the official map; see planthardiness.ars.usda.gov.
See all frost dates in Maryland, or the general guide to when to plant sweet corn.
Getting beds ready? Work out how much raised bed soil, compost or mulch you need with our sister site, Yard Coverage.