Massachusetts Frost Dates & Growing Zones by City
Boston is the only Massachusetts city with frost dates on this site so far. Its typical (50%) last spring frost is Apr 4, and its typical frost-free season is 218 days.
By the 2023 USDA hardiness map, these cities are in zones 6b and 7a.
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 |
|---|---|---|---|---|---|---|
| Boston frost dates | Apr 4 | Nov 9 | 218 | 6b–7a | High | Boston planting calendar |
Station match, data and rules: methodology. Long-term odds, not a forecast.