Frost Dates & Planting Calendars in Maine

Typical last spring frost, first fall frost, and growing-season length for 21 cities in Maine, based on NOAA 1991–2020 climate normals. Click a city for its full frost-date summary, monthly temperature chart, and 42-crop planting calendar.

CityLast Spring Frost (typical)First Fall Frost (typical)Growing SeasonUSDA Zone
Portland April 26 October 15 170 days 6a
Lewiston April 25 October 19 177 days 5b
Bangor May 4 October 4 152 days 5a
West Scarborough April 26 October 15 170 days 6a
South Portland April 26 October 15 170 days 6a
South Portland Gardens April 26 October 15 170 days 6a
Auburn April 25 October 19 177 days 5b
Biddeford May 9 October 3 146 days 5b
Sanford May 16 September 30 136 days 5b
Saco May 9 October 3 146 days 5b
Augusta April 27 October 16 172 days 5b
Westbrook April 26 October 15 170 days 5b
Waterville May 2 October 10 159 days 5b
Brunswick May 2 October 10 160 days 5b
York Beach May 1 October 14 165 days 6a
Wells Beach Station May 9 October 3 146 days 6a
Orono May 1 October 6 157 days 5a
Lisbon May 15 October 2 139 days 5b
North Bath May 10 October 6 149 days 5b
Brewer May 4 October 4 152 days 5a
Presque Isle May 14 September 26 131 days 4a