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Maryland frost dates
Across the 9Maryland weather stations below, the average last spring frost ranges from Mar 23 in Annapolis Naf to Apr 10 in Salisbury Wicomico. The statewide middle is about Apr 7 for the last spring frost and Nov 4 for the first fall frost. Annapolis Naf has the longest growing season, about 242 days. Hardiness zones in these places: 7a, 7b, 8a.
Frost dates by city
| Place | Zone | Last spring frost | 90% safe after | First fall frost | Frost-free days |
|---|---|---|---|---|---|
| Annapolis Naf | 8a | Mar 23 | Apr 6 | Nov 20 | 242 |
| Md Sci Ctr Baltimore | 8a | Mar 24 | Apr 4 | Nov 21 | 242 |
| Patuxent River | 8a | Mar 29 | Apr 10 | Nov 15 | 231 |
| Inigoes Webster Nolf | 8a | Mar 30 | Apr 11 | Nov 14 | 229 |
| Hagerstown Washington | 7a | Apr 7 | Apr 21 | Nov 4 | 211 |
| Ocean | 8a | Apr 7 | Apr 23 | Nov 2 | 209 |
| Aberdeen Phillips | 7b | Apr 10 | Apr 30 | Oct 30 | 203 |
| Baltimore Wash | 7b | Apr 10 | Apr 25 | Oct 31 | 204 |
| Salisbury Wicomico | 7b | Apr 10 | Apr 30 | Oct 30 | 203 |
Dates are the 50% probability of a 32°F freeze (NOAA 1991–2020 normals); "90% safe after" is the date after which a later spring freeze happens in only 1 year in 10.
When to plant in Maryland
Using the statewide middle dates (last frost Apr 7, first frost Nov 4). Adjust for your town with the table above or the planting calendar.
| Plant | When to plant in Maryland |
|---|---|
| Tomatoes | Apr 14 – Apr 28 |
| Peas | Feb 24 – Mar 17; fall: Aug 12 – Sep 2 |
| Potatoes | Mar 10 – Mar 31 |
| Green beans | Apr 14 – Apr 28; fall: Aug 19 – Sep 2 |
| Garlic | Nov 4 – Dec 2 |
| Tulips | Oct 21 – Dec 2 |