Maryland Frost Dates & Growing Zones by City
So far we cover one Maryland city with frost dates, Baltimore. Its typical (50%) last spring frost is Mar 24, and its typical frost-free season is 244 days.
By the 2023 USDA hardiness map, these cities are in zones 7b and 8a.
Dates come from the nearest NOAA station to each city that meets our quality rules, as the methodology explains.
| City | Last frost (50%) | First frost (50%) | Season (days, 50%) | Zone 2023 | Confidence | Planting calendar |
|---|---|---|---|---|---|---|
| Baltimore frost dates | Mar 24 | Nov 21 | 244 | 7b–8a | Medium | Baltimore planting calendar |
Station match, data and rules: methodology. Long-term odds, not a forecast.