Maryland frost dates
Across 43 NOAA climate stations in Maryland, the median last spring frost (32°F) ranges from Mar 22 at Solomons to May 9 at Sines Deep Creek; the typical station sees its last frost around Apr 8 and its first fall frost around Nov 2.
“Median” dates have a 50% chance of a later spring frost or an earlier fall frost. “10% risk” dates are the safer choice for tender plants: only 1 year in 10 has frost beyond them. Source: NOAA NCEI 1991–2020 Climate Normals. Elevation matters: within a state, frost dates can differ by a month or more between valleys and hills.
| Station | Elevation | Last frost (median) | Last frost (10% risk) | First frost (median) | First frost (10% risk) | Growing season |
|---|---|---|---|---|---|---|
| Aberdeen Phillips Fld | 57 ft | Apr 10 | Apr 30 | Oct 30 | Oct 14 | 201 days |
| Annapolis Naf | 8 ft | Mar 23 | Apr 6 | Nov 20 | Nov 4 | 241 days |
| Annapolis Police Brks | 25 ft | Mar 27 | Apr 9 | Nov 13 | Nov 1 | 234 days |
| Assateague | 10 ft | Mar 31 | Apr 13 | Nov 15 | Nov 1 | 228 days |
| Baltimore Wash Intl AP | 156 ft | Apr 10 | Apr 25 | Oct 31 | Oct 17 | 204 days |
| Beltsville | 145 ft | Apr 10 | May 1 | Nov 1 | Oct 16 | 202 days |
| Catoctin Mtn Park | 1,610 ft | Apr 14 | Apr 30 | Oct 30 | Oct 14 | 197 days |
| Chestertown | 40 ft | Apr 3 | Apr 16 | Nov 5 | Oct 24 | 217 days |
| Conowingo Dam | 40 ft | Apr 3 | Apr 18 | Nov 6 | Oct 26 | 217 days |
| Cumberland 2 | 730 ft | Apr 15 | May 5 | Oct 24 | Oct 9 | 190 days |
| Cylburn | 235 ft | Apr 2 | Apr 13 | Nov 7 | Oct 27 | 220 days |
| Dalecarlia Rsvr | 150 ft | Apr 9 | Apr 26 | Oct 31 | Oct 16 | 202 days |
| Damascus 3 Ssw | 700 ft | Apr 14 | May 2 | Oct 29 | Oct 13 | 196 days |
| Emmitsburg 2 Se | 403 ft | Apr 22 | May 9 | Oct 20 | Oct 7 | 179 days |
| Frederick Police Brks | 380 ft | Apr 2 | Apr 15 | Nov 6 | Oct 23 | 218 days |
| Frostburg 2 | 2,170 ft | Apr 29 | May 15 | Oct 18 | Oct 5 | 171 days |
| Glenn Dale Bell Stn | 150 ft | Apr 22 | May 9 | Oct 22 | Oct 7 | 183 days |
| Hagerstown 1 E | 532 ft | Apr 11 | Apr 27 | Oct 28 | Oct 14 | 199 days |
| Hagerstown Washington Co AP | 698 ft | Apr 7 | Apr 21 | Nov 4 | Oct 22 | 209 days |
| Laurel 3 W | 400 ft | Apr 5 | Apr 19 | Nov 9 | Oct 27 | 218 days |
| Md Sci Ctr Baltimore | 20 ft | Mar 24 | Apr 4 | Nov 21 | Nov 7 | 244 days |
| Mechanicsville 5 Ne | 100 ft | Apr 17 | May 2 | Oct 27 | Oct 12 | 195 days |
| Millers 4 Ne | 860 ft | Apr 19 | May 8 | Oct 25 | Oct 8 | 188 days |
| Natl Arboretum Dc | 50 ft | Mar 29 | Apr 11 | Nov 8 | Oct 26 | 224 days |
| Oakland 1 Se | 2,420 ft | May 6 | May 23 | Oct 9 | Sep 26 | 156 days |
| Ocean City Muni AP | 12 ft | Apr 7 | Apr 23 | Nov 2 | Oct 20 | 209 days |
| Oxon Hill | 190 ft | Apr 3 | Apr 15 | Nov 8 | Oct 24 | 217 days |
| Patuxent River Nas | 39 ft | Mar 29 | Apr 10 | Nov 15 | Nov 1 | 230 days |
| Rockville 1 Ne | 440 ft | Apr 1 | Apr 15 | Nov 6 | Oct 24 | 219 days |
| Royal Oak 2 Ssw | 10 ft | Apr 1 | Apr 15 | Nov 7 | Oct 24 | 220 days |
| Salisbury | 10 ft | Apr 3 | Apr 25 | Nov 7 | Oct 27 | 217 days |
| Salisbury 2N | 20 ft | Apr 2 | Apr 16 | Nov 10 | Oct 29 | 222 days |
| Salisbury Wicomico Rgnl AP | 48 ft | Apr 10 | Apr 30 | Oct 30 | Oct 15 | 201 days |
| Savage Rvr Dam | 1,495 ft | Apr 29 | May 15 | Oct 20 | Oct 4 | 174 days |
| Sharpsburg 5 S | 400 ft | Apr 26 | May 15 | Oct 18 | Oct 5 | 175 days |
| Sines Deep Creek | 2,040 ft | May 9 | May 30 | Oct 11 | Sep 27 | 155 days |
| Smithsburg 2NW | 670 ft | Apr 25 | May 11 | Oct 19 | Oct 6 | 176 days |
| Snow Hill 4 N | 30 ft | Apr 10 | Apr 28 | Oct 31 | Oct 16 | 202 days |
| Solomons | 12 ft | Mar 22 | Apr 5 | Nov 26 | Nov 10 | 248 days |
| St Inigoes Webster Nolf | 21 ft | Mar 30 | Apr 11 | Nov 14 | Oct 29 | 229 days |
| Stevensville 2SW | 10 ft | Mar 29 | Apr 8 | Nov 12 | Oct 29 | 228 days |
| Upper Marlboro 3 Nnw | 130 ft | Apr 9 | Apr 24 | Oct 29 | Oct 14 | 203 days |
| Vienna | 10 ft | Apr 8 | Apr 23 | Nov 4 | Oct 22 | 209 days |
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