Frost dates across Maryland
Typical last spring frost, first fall frost, and USDA zone for 6 Maryland cities, from 30-year NOAA climate normals. Every date is a 50 percent odds line, not a promise. Pick a city for the full frost window and what is plantable there now.
Not on the list? Any Maryland ZIP works.
| City | Last spring frost | First fall frost | Season length | Zone |
|---|---|---|---|---|
| Baltimore | Mar 24 | Nov 21 | about 242 days | 8a |
| Frederick | Apr 2 | Nov 6 | about 218 days | 7b |
| Gaithersburg | Apr 1 | Nov 6 | about 219 days | 7b |
| Rockville | Apr 1 | Nov 6 | about 219 days | 7b |
| Salisbury | Apr 2 | Nov 10 | about 222 days | 7b |
| Cumberland | Apr 15 | Oct 24 | about 192 days | 7a |
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