Frost dates in Maryland
Across Maryland, the typical last spring frost is around Apr 5 and the first fall frost around Nov 5. Your own dates depend on where you are in the state; find your county below.
Most of the state's last spring frosts fall between Mar 27 and Apr 19, and its first fall frosts between Oct 24 and Nov 15.
These are the dates with a 50% chance of a 32°F frost on or after (spring) or on or before (fall), so plan tender crops a week or two after the spring date and keep row cover handy. For dates at your exact ZIP code, use the zone and frost date lookup; for what to plant when, see the planting guide by frost date.
Hardiness zones in Maryland: zone 6a, zone 6b, zone 7a, zone 7b, zone 8a
Frost dates by county in Maryland
| County | Last spring frost | First fall frost | Growing season |
|---|---|---|---|
| Allegany | Apr 23 | Oct 21 | About 181 days |
| Anne Arundel | Apr 5 | Nov 9 | About 218 days |
| Baltimore | Apr 2 | Nov 7 | About 219 days |
| Calvert | Apr 9 | Oct 29 | About 203 days |
| Caroline | Apr 11 | Nov 4 | About 207 days |
| Carroll | Apr 19 | Oct 25 | About 189 days |
| Cecil | Apr 7 | Nov 2 | About 209 days |
| Charles | Apr 17 | Oct 27 | About 193 days |
| Dorchester | Apr 8 | Nov 4 | About 210 days |
| Frederick | Apr 2 | Nov 6 | About 218 days |
| Garrett | Apr 29 | Oct 20 | About 174 days |
| Harford | Apr 10 | Oct 30 | About 203 days |
| Howard | Apr 10 | Nov 7 | About 211 days |
| Kent | Apr 3 | Nov 5 | About 216 days |
| Montgomery | Apr 9 | Nov 6 | About 211 days |
| Prince George's | Apr 9 | Nov 1 | About 206 days |
| Queen Anne's | Apr 3 | Nov 5 | About 216 days |
| Somerset | Mar 31 | Nov 11 | About 225 days |
| St. Mary's | Mar 30 | Nov 14 | About 229 days |
| Talbot | Apr 1 | Nov 7 | About 220 days |
| Washington | Apr 11 | Oct 28 | About 200 days |
| Wicomico | Apr 8 | Nov 4 | About 210 days |
| Worcester | Apr 7 | Nov 2 | About 209 days |
Source: NOAA NCEI U.S. Climate Normals 1991–2020, 50% probability of 32°F, from the weather station nearest each ZIP code; each county shows the middle value across its ZIP codes. Hills, valleys and cities can run a week or more earlier or later.