| 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 | 203 | 10 Apr | 28 Oct | 264 |
| Clim. Div. 1 | 217 | 2 Apr | 4 Nov | 283 |
| Clim. Div. 2 | 213 | 3 Apr | 1 Nov | 276 |
| Clim. Div. 3 | 212 | 5 Apr | 2 Nov | 276 |
| Clim. Div. 4 | 206 | 8 Apr | 30 Oct | 273 |
| Clim. Div. 5 | 213 | 5 Apr | 3 Nov | 272 |
| Clim. Div. 6 | 194 | 14 Apr | 24 Oct | 256 |
| Clim. Div. 7 | 176 | 23 Apr | 15 Oct | 243 |
| Clim. Div. 8 | 149 | 9 May | 4 Oct | 218 |
| Allegany | 171 | 26 Apr | 13 Oct | 239 |
| Anne Arundel | 214 | 4 Apr | 3 Nov | 278 |
| Baltimore | 196 | 13 Apr | 24 Oct | 256 |
| Calvert | 215 | 3 Apr | 4 Nov | 277 |
| Caroline | 201 | 10 Apr | 27 Oct | 267 |
| Carroll | 182 | 20 Apr | 18 Oct | 246 |
| Cecil | 207 | 8 Apr | 31 Oct | 263 |
| Charles | 204 | 8 Apr | 29 Oct | 273 |
| Dorchester | 217 | 2 Apr | 4 Nov | 279 |
| Frederick | 188 | 17 Apr | 21 Oct | 252 |
| Garrett | 149 | 9 May | 4 Oct | 218 |
| Harford | 203 | 10 Apr | 28 Oct | 260 |
| Howard | 190 | 16 Apr | 22 Oct | 255 |
| Kent | 214 | 4 Apr | 3 Nov | 273 |
| Montgomery | 192 | 15 Apr | 23 Oct | 262 |
| Prince George's | 202 | 9 Apr | 28 Oct | 269 |
| Queen Anne's | 210 | 6 Apr | 1 Nov | 271 |
| Saint Mary's | 218 | 2 Apr | 5 Nov | 280 |
| Somerset | 223 | 31 Mar | 8 Nov | 288 |
| Talbot | 221 | 31 Mar | 7 Nov | 281 |
| Washington | 182 | 19 Apr | 17 Oct | 247 |
| Wicomico | 207 | 8 Apr | 31 Oct | 276 |
| Worcester | 218 | 3 Apr | 5 Nov | 286 |
| Baltimore City | 214 | 4 Apr | 3 Nov | 275 |