| Region | Duration of the Growing Season (days) | Start of the Growing Season | End of the Growing Season | Number of Days in the year with Minimum Temperature Above Freezing |
|---|---|---|---|---|
| Statewide | 233 | 26 Mar | 13 Nov | 297 |
| Clim. Div. 1 | 247 | 26 Mar | 27 Nov | 299 |
| Clim. Div. 2 | 251 | 24 Mar | 29 Nov | 304 |
| Clim. Div. 3 | 249 | 26 Mar | 29 Nov | 303 |
| Clim. Div. 4 | 249 | 26 Mar | 29 Nov | 302 |
| Clim. Div. 5 | 233 | 26 Mar | 13 Nov | 301 |
| Clim. Div. 6 | 231 | 27 Mar | 12 Nov | 293 |
| Clim. Div. 7 | 215 | 27 Mar | 27 Oct | 280 |
| Clim. Div. 8 | 170 | 24 Apr | 10 Oct | 248 |
| Allegany | 186 | 24 Apr | 26 Oct | 276 |
| Anne Arundel | 249 | 26 Mar | 29 Nov | 307 |
| Baltimore | 232 | 26 Mar | 12 Nov | 294 |
| Calvert | 249 | 26 Mar | 29 Nov | 304 |
| Caroline | 233 | 26 Mar | 13 Nov | 297 |
| Carroll | 215 | 27 Mar | 27 Oct | 289 |
| Cecil | 233 | 26 Mar | 13 Nov | 297 |
| Charles | 248 | 27 Mar | 29 Nov | 297 |
| Dorchester | 249 | 24 Mar | 27 Nov | 303 |
| Frederick | 231 | 27 Mar | 12 Nov | 291 |
| Garrett | 170 | 24 Apr | 10 Oct | 248 |
| Harford | 233 | 26 Mar | 13 Nov | 295 |
| Howard | 215 | 27 Mar | 27 Oct | 292 |
| Kent | 235 | 24 Mar | 13 Nov | 301 |
| Montgomery | 231 | 27 Mar | 12 Nov | 301 |
| Prince George's | 249 | 26 Mar | 29 Nov | 300 |
| Queen Anne's | 233 | 26 Mar | 13 Nov | 301 |
| Saint Mary's | 249 | 26 Mar | 29 Nov | 299 |
| Somerset | 249 | 24 Mar | 27 Nov | 303 |
| Talbot | 272 | 3 Mar | 29 Nov | 309 |
| Washington | 215 | 27 Mar | 27 Oct | 284 |
| Wicomico | 217 | 26 Mar | 28 Oct | 296 |
| Worcester | 249 | 24 Mar | 27 Nov | 303 |
| Baltimore City | 249 | 26 Mar | 29 Nov | 303 |