FrostCal

When to Plant Zucchini in New Hampshire

In a typical New Hampshire location, start seeds indoors Apr 12 – Apr 19, then sow outdoors May 10 – May 24, then transplant outdoors May 10 – May 17. Across the state, the outdoor planting window starts as early as Apr 28 in Salem and as late as May 21 in Berlin.

Method Direct sow
Days to maturity 45–55 days

Fast-growing squash; direct sow 1-3 weeks after last frost, or start indoors 2-3 weeks early for a head start.

Zucchini Planting Dates by City

CityStart indoorsDirect sowTransplant
ManchesterApr 9 – Apr 16May 7 – May 21May 7 – May 14
NashuaApr 9 – Apr 16May 7 – May 21May 7 – May 14
ConcordApr 17 – Apr 24May 15 – May 29May 15 – May 22
East ConcordApr 17 – Apr 24May 15 – May 29May 15 – May 22
Derry VillageApr 9 – Apr 16May 7 – May 21May 7 – May 14
DoverApr 12 – Apr 19May 10 – May 24May 10 – May 17
RochesterApr 9 – Apr 16May 7 – May 21May 7 – May 14
SalemMar 31 – Apr 7Apr 28 – May 12Apr 28 – May 5
MerrimackApr 9 – Apr 16May 7 – May 21May 7 – May 14
KeeneApr 23 – Apr 30May 21 – Jun 4May 21 – May 28
DerryApr 9 – Apr 16May 7 – May 21May 7 – May 14
PortsmouthApr 13 – Apr 20May 11 – May 25May 11 – May 18
BedfordMar 31 – Apr 7Apr 28 – May 12Apr 28 – May 5
LaconiaApr 9 – Apr 16May 7 – May 21May 7 – May 14
LebanonApr 18 – Apr 25May 16 – May 30May 16 – May 23
WindhamApr 12 – Apr 19May 10 – May 24May 10 – May 17
ClaremontApr 23 – Apr 30May 21 – Jun 4May 21 – May 28
PelhamApr 12 – Apr 19May 10 – May 24May 10 – May 17
SomersworthApr 9 – Apr 16May 7 – May 21May 7 – May 14
LondonderryMar 31 – Apr 7Apr 28 – May 12Apr 28 – May 5
DurhamApr 17 – Apr 24May 15 – May 29May 15 – May 22
HamptonApr 13 – Apr 20May 11 – May 25May 11 – May 18
BerlinApr 23 – Apr 30May 21 – Jun 4May 21 – May 28
ExeterApr 13 – Apr 20May 11 – May 25May 11 – May 18

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 zucchini in New Hampshire?

In a typical New Hampshire location, start seeds indoors Apr 12 – Apr 19, then sow outdoors May 10 – May 24, then transplant outdoors May 10 – May 17. Across the state, the outdoor planting window starts as early as Apr 28 in Salem and as late as May 21 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 zucchini take to grow?

Zucchini typically take 45–55 days from planting to harvest. Fast-growing squash; direct sow 1-3 weeks after last frost, or start indoors 2-3 weeks early for a head start.

Other Crops in New Hampshire

When to plant zucchini in other states

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