When to plant sunflowers in Maine

Sow outdoors in Portland

Apr 26–May 17

Across Maine the window opens between April 25 and May 16. Find your city below; the dates follow each town's own average last frost.

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

PortlandApr 26–May 17

LewistonApr 25–May 16

BangorMay 4–May 25

South PortlandApr 26–May 17

AuburnApr 25–May 16

SanfordMay 16–Jun 6

BiddefordMay 9–May 30

WestbrookApr 26–May 17

SacoApr 26–May 17

When should I plant sunflowers in Maine?

In Portland, sow outdoors from April 26 to May 17. Across Maine the window opens between April 25 and May 16, 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.