When to plant Sweet potatoes in New Hampshire

In spring, May 20 – June 10.

In fall, from May 20 – June 10 in Dover to June 1 – 15 in Laconia.

USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.

Sweet potatoes planting dates by place in New Hampshire
PlaceSpringFall
ClaremontNot listedNot listed
ConcordNot listedNot listed
DoverMay 20 – June 10May 20 – June 10
KeeneNot listedNot listed
LaconiaMay 20 – June 10June 1 – 15
LebanonNot listedMay 20 – June 10
ManchesterMay 20 – June 10May 20 – June 10
NashuaMay 20 – June 10May 20 – June 10
PortsmouthMay 20 – June 10May 20 – June 10
RochesterMay 20 – June 10May 20 – June 10
SomersworthMay 20 – June 10May 20 – June 10

Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. “—” means the place's frost date is outside the table. The full USDA table for sweet potatoes.