Frost dates · Massachusetts
Massachusetts frost dates,
county by county.
Last spring frost and first fall frost probability data for all 14 counties in Massachusetts, computed from the NOAA 1991–2020 Climate Normals. Every county page surfaces the full probability table at three temperature thresholds plus crop-specific planting guidance.
Variation across Massachusetts
30 days separate the earliest and latest counties.
The median last spring frost in Suffolk County is March 28 — 30 days earlier than Berkshire County at April 27. Statewide averages aren't useful planting tools; pick your county below for the data that actually applies to your fields.
By frost timing
Counties sorted by last spring frost.
Latest at top, earliest at bottom. In most states this matches the north-to-south gradient.
- Berkshire CountySpring Apr 27·Fall Oct 15171-day season
- Dukes CountySpring Apr 26·Fall Oct 25182-day season
- Essex CountySpring Apr 23·Fall Oct 25185-day season
- Hampshire CountySpring Apr 23·Fall Oct 21181-day season
- Hampden CountySpring Apr 21·Fall Oct 20182-day season
- Middlesex CountySpring Apr 21·Fall Oct 18180-day season
- Franklin CountySpring Apr 18·Fall Oct 25190-day season
- Bristol CountySpring Apr 15·Fall Oct 28196-day season
- Worcester CountySpring Apr 11·Fall Nov 1204-day season
- Norfolk CountySpring Apr 8·Fall Oct 23198-day season
- Plymouth CountySpring Apr 3·Fall Nov 13224-day season
- Barnstable CountySpring Apr 1·Fall Nov 17230-day season
- Nantucket CountySpring Mar 31·Fall Nov 23237-day season
- Suffolk CountySpring Mar 28·Fall Nov 21238-day season