Connecticut frost dates by county and ZIP code

Red covered bridge over a rocky stream among autumn trees at Kent Falls State Park, Connecticut — Photo: Dougtone, CC BY-SA 2.0, via Wikimedia Commons

Across 288 Connecticut ZIP codes the average last spring frost runs Apr 5 to May 11 and the average first fall frost Oct 4 to Nov 6 (50% odds, 32°F, NOAA 1991–2020 normals), with USDA hardiness zones. Download the table as CSV.

Counties

Fairfield
Hartford
Litchfield
Middlesex
New Haven
New London
Tolland
Windham

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