Maine frost dates by county and ZIP code

Autumn trees reflected in a misty pond in Acadia National Park, Maine — Photo: National Park Service / uncredited derivative work: User:Maps and stuff (cropped, Public domain, via Wikimedia Commons

Across 427 Maine ZIP codes the average last spring frost runs Apr 21 to Jun 2 and the average first fall frost Sep 13 to Oct 26 (50% odds, 32°F, NOAA 1991–2020 normals), with USDA hardiness zones. Download the table as CSV.

Counties

Androscoggin
Aroostook
Cumberland
Franklin
Hancock
Kennebec
Knox
Lincoln
Oxford
Penobscot
Piscataquis
Sagadahoc
Somerset
Waldo
Washington
York

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