When to plant cauliflower in New Hampshire

Cauliflower
Plant out in Manchester
Apr 16–Apr 30

Across New Hampshire the window opens between April 15 and April 30. Find your city below; the dates follow each town's own average last frost.

Start indoors, Manchester
Feb 19–Mar 5
Plant out, Manchester
Apr 16–Apr 30
Fall planting, Manchester
Jul 19–Aug 2
Last frost, Manchester
Apr 30

Start seeds indoors 8–10 weeks before the last frost; plant out up to 2 weeks before the last frost; sow again for fall 10–12 weeks before the first frost. When heads reach the size of an egg, tie the leaves over them to keep them white.

Cauliflower planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
JanFebMarAprMayJunJulAugSepOctNovDec
ManchesterApr 16–Apr 30
NashuaApr 15–Apr 29
ConcordApr 24–May 8
DoverApr 19–May 3
RochesterApr 16–Apr 30
KeeneApr 30–May 14
PortsmouthApr 20–May 4
DerryApr 16–Apr 30

Questions

When should I plant cauliflower in New Hampshire?

In Manchester, plant out from April 16 to April 30. Across New Hampshire the window opens between April 15 and April 30, depending on the local last frost.

How is this date worked out?

Start seeds indoors 8–10 weeks before the last frost; plant out up to 2 weeks before the last frost; sow again for fall 10–12 weeks before the first frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for New Hampshire

Cauliflower in other states

Frost dates for every city in New Hampshire