Frost dates and growing zones in Maine

2 town pages so far. Zones from the 2023 USDA Plant Hardiness Zone Map, frost dates from NOAA 1991-2020 normals at the nearest weather station.

Towns covered so far in Maine fall in USDA zones 5a, 6a. Median dates mean frost comes later (spring) or earlier (fall) in half of years.

Towns

Town	Zone	Median last frost	Median first frost
Portland	6a	Apr 26	Oct 15
Bangor	5a	May 4	Oct 4