| 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 | 217 | 1 Apr | 3 Nov | 275 |
| Clim. Div. 1 | 226 | 28 Mar | 9 Nov | 292 |
| Clim. Div. 2 | 225 | 29 Mar | 8 Nov | 286 |
| Clim. Div. 3 | 224 | 31 Mar | 8 Nov | 287 |
| Clim. Div. 4 | 221 | 31 Mar | 7 Nov | 284 |
| Clim. Div. 5 | 224 | 30 Mar | 8 Nov | 281 |
| Clim. Div. 6 | 211 | 6 Apr | 1 Nov | 268 |
| Clim. Div. 7 | 188 | 19 Apr | 23 Oct | 254 |
| Clim. Div. 8 | 163 | 3 May | 12 Oct | 229 |
| Allegany | 182 | 23 Apr | 20 Oct | 250 |
| Anne Arundel | 229 | 28 Mar | 11 Nov | 288 |
| Baltimore | 212 | 5 Apr | 2 Nov | 268 |
| Calvert | 226 | 29 Mar | 10 Nov | 287 |
| Caroline | 215 | 2 Apr | 3 Nov | 278 |
| Carroll | 198 | 12 Apr | 26 Oct | 258 |
| Cecil | 218 | 2 Apr | 5 Nov | 274 |
| Charles | 220 | 31 Mar | 5 Nov | 284 |
| Dorchester | 227 | 29 Mar | 9 Nov | 289 |
| Frederick | 203 | 9 Apr | 28 Oct | 264 |
| Garrett | 163 | 3 May | 12 Oct | 229 |
| Harford | 214 | 5 Apr | 4 Nov | 270 |
| Howard | 208 | 7 Apr | 30 Oct | 268 |
| Kent | 225 | 29 Mar | 8 Nov | 282 |
| Montgomery | 209 | 6 Apr | 1 Nov | 274 |
| Prince George's | 220 | 1 Apr | 5 Nov | 280 |
| Queen Anne's | 223 | 30 Mar | 7 Nov | 281 |
| Saint Mary's | 228 | 28 Mar | 11 Nov | 288 |
| Somerset | 230 | 27 Mar | 11 Nov | 296 |
| Talbot | 229 | 27 Mar | 11 Nov | 290 |
| Washington | 195 | 13 Apr | 24 Oct | 258 |
| Wicomico | 221 | 31 Mar | 6 Nov | 285 |
| Worcester | 227 | 28 Mar | 10 Nov | 295 |
| Baltimore City | 227 | 29 Mar | 10 Nov | 285 |