New Hampshire frost dates by county and ZIP code

Bright red and orange fall foliage reflected in a pond in the White Mountains, New Hampshire — Photo: Rene Schwietzke, CC BY 2.0, via Wikimedia Commons

Across 246 New Hampshire ZIP codes the average last spring frost runs Apr 13 to May 31 and the average first fall frost Sep 18 to Oct 28 (50% odds, 32°F, NOAA 1991–2020 normals), with USDA hardiness zones. Download the table as CSV.

Counties

Belknap
Carroll
Cheshire
Coos
Grafton
Hillsborough
Merrimack
Rockingham
Strafford
Sullivan

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