When to plant Turnips in New Hampshire

In spring, from Mar 20 – May 1 in Dover to Apr 1 – June 1 in Lebanon.

In fall, from June 1 – Aug 1 in Claremont to July 15 – Aug 15 in Laconia.

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

Turnips planting dates by place in New Hampshire
PlaceSpringFall
ClaremontApr 1 – June 1June 1 – Aug 1
ConcordApr 1 – June 1June 1 – Aug 1
DoverMar 20 – May 1July 1 – Aug 1
KeeneApr 1 – June 1June 1 – Aug 1
LaconiaMar 20 – May 1July 15 – Aug 15
LebanonApr 1 – June 1July 1 – Aug 1
ManchesterMar 20 – May 1July 1 – Aug 1
NashuaMar 20 – May 1July 1 – Aug 1
PortsmouthMar 20 – May 1July 1 – Aug 1
RochesterMar 20 – May 1July 1 – Aug 1
SomersworthMar 20 – May 1July 1 – Aug 1

Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. The full USDA table for turnips.