City	Sow outdoors	Last frost
Newark	Apr 4 to Apr 25	Apr 4
Jersey City	Apr 4 to Apr 25	Apr 4
Paterson	Apr 15 to May 6	Apr 15
Elizabeth	Apr 2 to Apr 23	Apr 2
Toms River	Apr 23 to May 14	Apr 23
Trenton	Apr 17 to May 8	Apr 17
Clifton	Apr 15 to May 6	Apr 15
Bayonne	Apr 2 to Apr 23	Apr 2
East Orange	Apr 4 to Apr 25	Apr 4
Camden	Mar 30 to Apr 20	Mar 30
Passaic	Apr 3 to Apr 24	Apr 3
Lakewood	Apr 23 to May 14	Apr 23
Union City	Mar 30 to Apr 20	Mar 30
Vineland	Apr 24 to May 15	Apr 24
Hoboken	Mar 30 to Apr 20	Mar 30
Plainfield	Apr 11 to May 2	Apr 11
New Brunswick	Apr 15 to May 6	Apr 15
Perth Amboy	Apr 15 to May 6	Apr 15
West New York	Mar 30 to Apr 20	Mar 30
Sayreville	Apr 15 to May 6	Apr 15
Hackensack	Apr 3 to Apr 24	Apr 3
Linden	Apr 2 to Apr 23	Apr 2
Sicklerville	Apr 8 to Apr 29	Apr 8
Kearny	Apr 4 to Apr 25	Apr 4
Fort Lee	Apr 3 to Apr 24	Apr 3
Atlantic City	Mar 26 to Apr 16	Mar 26
Fair Lawn	Apr 3 to Apr 24	Apr 3
Garfield	Apr 3 to Apr 24	Apr 3
Long Branch	Apr 9 to Apr 30	Apr 9
Westfield	Apr 11 to May 2	Apr 11
Princeton	Apr 25 to May 16	Apr 25
Rahway	Apr 11 to May 2	Apr 11
Englewood	Apr 3 to Apr 24	Apr 3
Bergenfield	Apr 3 to Apr 24	Apr 3
Bridgeton	Apr 10 to May 1	Apr 10
Millville	Apr 24 to May 15	Apr 24
Old Bridge	Apr 17 to May 8	Apr 17
Paramus	Apr 3 to Apr 24	Apr 3
Cliffside Park	Mar 30 to Apr 20	Mar 30
Ridgewood	Apr 15 to May 6	Apr 15
Lodi	Apr 3 to Apr 24	Apr 3
Carteret	Apr 2 to Apr 23	Apr 2
South Plainfield	Apr 11 to May 2	Apr 11
Glassboro	Apr 8 to Apr 29	Apr 8
Somerset	Apr 15 to May 6	Apr 15
Summit	Apr 18 to May 9	Apr 18
Roselle	Apr 11 to May 2	Apr 11
North Plainfield	Apr 11 to May 2	Apr 11
Secaucus	Apr 3 to Apr 24	Apr 3
Hillsborough	Apr 30 to May 21	Apr 30
Harrison	Apr 4 to Apr 25	Apr 4
Lindenwold	Apr 8 to Apr 29	Apr 8
Parsippany	Apr 17 to May 8	Apr 17
Elmwood Park	Apr 3 to Apr 24	Apr 3
Pleasantville	Mar 26 to Apr 16	Mar 26
Morristown	Apr 18 to May 9	Apr 18
Palisades Park	Apr 3 to Apr 24	Apr 3
Hawthorne	Apr 15 to May 6	Apr 15
Woodbridge	Apr 11 to May 2	Apr 11

Questions

When should I plant sunflowers in New Jersey?

In Newark, sow outdoors from April 4 to April 25. Across New Jersey the window opens between March 26 and April 30, depending on the local last frost.

How is this date worked out?

Sow outdoors up to 3 weeks after the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.