Maryland frost dates: Last spring and first autumn frost at every NOAA station, 1991-2020
Across Maryland's 43 NOAA stations with frost dates, the median last spring frost (32°F) runs from March 22 in Solomons to May 9 in Sines Deep Creek; for half of its places it comes after April 10.
- Typical last spring frost
- April 10median of 26 places
- Typical first autumn frost
- October 31median of 26 places
- Earliest last frost
- March 22Solomons
- Latest last frost
- May 9Sines Deep Creek
When is the last frost in Maryland, town by town?
Each date is NOAA's: "after April 10 in half of years" means the last 32°F night of spring came after April 10 in half of the years 1991-2020. By the 1-in-10 date, the last frost has passed in nine years out of ten.
Find your town in the list, or look up a ZIP code for the stations nearest it.
| Place or station | Last frost (median) | 1 in 10 after | First frost (median) | 1 in 10 before | Growing season | Zone |
|---|---|---|---|---|---|---|
| Solomons | March 22 | April 5 | November 26 | November 10 | 248 days | – |
| AnnapolisAnnapolis Naf | March 23 | April 6 | November 20 | November 4 | 241 days | 8a |
| Maryland Science Center Baltimore | March 24 | April 4 | November 21 | November 7 | 244 days | 8a |
| Annapolis Police Barracks | March 27 | April 9 | November 13 | November 1 | 234 days | – |
| National Arboretum DC | March 29 | April 11 | November 8 | October 26 | 224 days | 8a |
| Patuxent River Naval Air Station | March 29 | April 10 | November 15 | November 1 | 230 days | 8a |
| Stevensville2 mi SW | March 29 | April 8 | November 12 | October 29 | 228 days | – |
| St Inigoes Webster NOLF | March 30 | April 11 | November 14 | October 29 | 229 days | – |
| Assateague | March 31 | April 13 | November 15 | November 1 | 228 days | 8a |
| Rockville1 mi NE | April 1 | April 15 | November 6 | October 24 | 219 days | 7b |
| Royal Oak (2 mi SSW) | April 1 | April 15 | November 7 | October 24 | 220 days | 8a |
| Cylburn | April 2 | April 13 | November 7 | October 27 | 220 days | – |
| FrederickFrederick Police Barracks | April 2 | April 15 | November 6 | October 23 | 218 days | – |
| Salisbury (2 mi N) | April 2 | April 16 | November 10 | October 29 | 222 days | – |
| Chestertown | April 3 | April 16 | November 5 | October 24 | 217 days | 7b |
| Conowingo Dam | April 3 | April 18 | November 6 | October 26 | 217 days | – |
| Oxon Hill | April 3 | April 15 | November 8 | October 24 | 217 days | 8a |
| Salisbury station | April 3 | April 25 | November 7 | October 27 | 217 days | 8a |
| Laurel3 mi W | April 5 | April 19 | November 9 | October 27 | 218 days | 7b |
| HagerstownHagerstown Regional Airport | April 7 | April 21 | November 4 | October 22 | 209 days | 7b |
| Ocean CityOcean City Municipal Airport | April 7 | April 23 | November 2 | October 20 | 209 days | 7b |
| Vienna | April 8 | April 23 | November 4 | October 22 | 209 days | – |
| Dalecarlia Reservoir | April 9 | April 26 | October 31 | October 16 | 202 days | 7b |
| Upper Marlboro3 mi NNW | April 9 | April 24 | October 29 | October 14 | 203 days | 7b |
| AberdeenAberdeen Phillips Field | April 10 | April 30 | October 30 | October 14 | 201 days | – |
| BaltimoreBaltimore Wash International Airport | April 10 | April 25 | October 31 | October 17 | 204 days | 7b |
| Beltsville | April 10 | May 1 | November 1 | October 16 | 202 days | 7b |
| SalisburySalisbury-Wicomico Regional Airport | April 10 | April 30 | October 30 | October 15 | 201 days | 7b |
| Snow Hill4 mi N | April 10 | April 28 | October 31 | October 16 | 202 days | 7b |
| Hagerstown (1 mi E) | April 11 | April 27 | October 28 | October 14 | 199 days | 7a |
| Catoctin Mountain Park | April 14 | April 30 | October 30 | October 14 | 197 days | 7a |
| Damascus3 mi SSW | April 14 | May 2 | October 29 | October 13 | 196 days | 7a |
| CumberlandCumberland 2 | April 15 | May 5 | October 24 | October 9 | 190 days | 7a |
| Mechanicsville5 mi NE | April 17 | May 2 | October 27 | October 12 | 195 days | 7b |
| Millers (4 mi NE) | April 19 | May 8 | October 25 | October 8 | 188 days | 7a |
| Emmitsburg2 mi SE | April 22 | May 9 | October 20 | October 7 | 179 days | 7a |
| Glenn DaleGlenn Dale Bell Station | April 22 | May 9 | October 22 | October 7 | 183 days | – |
| Smithsburg2 mi NW | April 25 | May 11 | October 19 | October 6 | 176 days | – |
| Sharpsburg5 mi S | April 26 | May 15 | October 18 | October 5 | 175 days | – |
| FrostburgFrostburg 2 | April 29 | May 15 | October 18 | October 5 | 171 days | 6b |
| Savage River Dam | April 29 | May 15 | October 20 | October 4 | 174 days | 6b |
| Oakland1 mi SE | May 6 | May 23 | October 9 | September 26 | 156 days | 6a |
| Sines Deep Creek | May 9 | May 30 | October 11 | September 27 | 155 days | – |
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities, growing-season length); station daily lows via ACIS (zone). Growing season: NOAA's median number of days between the last spring and first autumn 32°F night. Zone: the USDA's plant hardiness rule applied to the station's own 1991-2020 coldest nights.