Frost dates · Connecticut
Connecticut frost dates,
county by county.
Last spring frost and first fall frost probability data for all 9 counties in Connecticut, 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 Connecticut
25 days separate the earliest and latest counties.
The median last spring frost in Greater Bridgeport Planning Region is March 26 — 25 days earlier than Northwest Hills Planning Region at April 20. Statewide averages aren't useful planting tools; pick your county below for the data that actually applies to your fields.
Alphabetical
All Connecticut counties — A to Z.
- Capitol Planning Region
- Greater Bridgeport Planning Region
- Lower Connecticut River Valley Planning Region
- Naugatuck Valley Planning Region
- Northeastern Connecticut Planning Region
- Northwest Hills Planning Region
- South Central Connecticut Planning Region
- Southeastern Connecticut Planning Region
- Western Connecticut Planning Region