FrostCal

When to Plant Sweet Potatoes in New Hampshire

In a typical New Hampshire location, plant outdoors May 17 – May 31. Across the state, the outdoor planting window starts as early as May 5 in Salem and as late as May 28 in Berlin.

Method Plant out (slips, crowns, or tubers)
Days to maturity 90–120 days

Set out slips 2-4 weeks after last frost once soil is thoroughly warm (65F+); very frost/cold sensitive.

Sweet Potatoes Planting Dates by City

CityPlant outdoors
ManchesterMay 14 – May 28
NashuaMay 14 – May 28
ConcordMay 22 – Jun 5
East ConcordMay 22 – Jun 5
Derry VillageMay 14 – May 28
DoverMay 17 – May 31
RochesterMay 14 – May 28
SalemMay 5 – May 19
MerrimackMay 14 – May 28
KeeneMay 28 – Jun 11
DerryMay 14 – May 28
PortsmouthMay 18 – Jun 1
BedfordMay 5 – May 19
LaconiaMay 14 – May 28
LebanonMay 23 – Jun 6
WindhamMay 17 – May 31
ClaremontMay 28 – Jun 11
PelhamMay 17 – May 31
SomersworthMay 14 – May 28
LondonderryMay 5 – May 19
DurhamMay 22 – Jun 5
HamptonMay 18 – Jun 1
BerlinMay 28 – Jun 11
ExeterMay 18 – Jun 1

Showing the 24 most populous of 24 New Hampshire cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all New Hampshire cities.

Frequently Asked Questions

When should I plant sweet potatoes in New Hampshire?

In a typical New Hampshire location, plant outdoors May 17 – May 31. Across the state, the outdoor planting window starts as early as May 5 in Salem and as late as May 28 in Berlin.

When is the last frost in New Hampshire?

The average last spring frost in New Hampshire ranges from April 21 in Salem to May 14 in Berlin, based on NOAA 1991–2020 climate normals.

How long do sweet potatoes take to grow?

Sweet Potatoes typically take 90–120 days from planting to harvest. Set out slips 2-4 weeks after last frost once soil is thoroughly warm (65F+); very frost/cold sensitive.

Other Crops in New Hampshire

When to plant sweet potatoes in other states

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