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.
By geography
Connecticut counties on the map.
Each polygon is a county. Click for full frost-date detail. Color shows last-spring-frost timing — sage = earliest, amber = latest.
MapList
Last spring frostEarliestMedianLatest
8 counties · click any county for full frost data