FrostCal

Frost Dates & Planting Calendars in New Hampshire

In New Hampshire, the average last spring frost ranges from April 21 in Salem to May 14 in Berlin, and the average first fall frost from September 30 in Berlin to October 21 in Salem. Pick a city for its full frost-date summary and 42-crop planting calendar.

CityLast Spring Frost (typical)First Fall Frost (typical)Growing SeasonUSDA Zone
Manchester April 30 October 11 164 days 6a
Nashua April 30 October 12 165 days 6a
Concord May 8 October 3 146 days 5b
East Concord May 8 October 3 146 days 5b
Derry Village April 30 October 11 162 days 6a
Dover May 3 October 10 158 days 6a
Rochester April 30 October 9 161 days 6a
Salem April 21 October 21 182 days 6a
Merrimack April 30 October 12 165 days 6a
Keene May 14 October 1 138 days 5b
Derry April 30 October 11 162 days 6a
Portsmouth May 4 October 8 157 days 6a
Bedford April 21 October 19 180 days 6a
Laconia April 30 October 18 170 days 5b
Lebanon May 9 October 6 148 days 5a
Windham May 3 October 8 156 days 6a
Claremont May 14 October 1 140 days 5b
Pelham May 3 October 8 156 days 6a
Somersworth April 30 October 9 161 days 6a
Londonderry April 21 October 19 180 days 6a
Durham May 8 October 4 148 days 6a
Hampton May 4 October 8 157 days 6a
Berlin May 14 September 30 135 days 4b
Exeter May 4 October 8 157 days 6a

When to Plant in New Hampshire