When to plant sunflowers in Delaware

Sunflowers
Sow outdoors in Wilmington
Apr 7–Apr 28

Across Delaware the window opens between April 4 and April 7. Find your city below; the dates follow each town's own average last frost.

Sow outdoors, Wilmington
Apr 7–Apr 28
Last sowing for a harvest
Jul 13
Last frost, Wilmington
Apr 7

Sow outdoors up to 3 weeks after the last frost. Sow every two weeks until midsummer for flowers through fall.

Sunflowers planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
JanFebMarAprMayJunJulAugSepOctNovDec
WilmingtonApr 7–Apr 28
DoverApr 4–Apr 25
NewarkApr 7–Apr 28
MiddletownApr 7–Apr 28
BearApr 7–Apr 28

Questions

When should I plant sunflowers in Delaware?

In Wilmington, sow outdoors from April 7 to April 28. Across Delaware the window opens between April 4 and April 7, 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.

More for Delaware

Sunflowers in other states

Frost dates for every city in Delaware