When to plant sweet potatoes in New Hampshire

Sweet potatoes
Plant out in Manchester
May 21–Jun 4

Across New Hampshire the window opens between May 20 and June 4. Find your city below; the dates follow each town's own average last frost.

Plant out, Manchester
May 21–Jun 4
Last sowing for a harvest
May 30
Last frost, Manchester
Apr 30

Plant out 3–5 weeks after the last frost. Set out slips when the soil is warm, around 65°F. They need a long, hot season.

Sweet potatoes planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
JanFebMarAprMayJunJulAugSepOctNovDec
ManchesterMay 21–Jun 4
NashuaMay 20–Jun 3
ConcordMay 29–Jun 12
DoverMay 24–Jun 7
RochesterMay 21–Jun 4
KeeneJun 4–Jun 18
PortsmouthMay 25–Jun 8
DerryMay 21–Jun 4

Questions

When should I plant sweet potatoes in New Hampshire?

In Manchester, plant out from May 21 to June 4. Across New Hampshire the window opens between May 20 and June 4, depending on the local last frost.

How is this date worked out?

Plant out 3–5 weeks after the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for New Hampshire

Sweet potatoes in other states

Frost dates for every city in New Hampshire