When to plant sunflowers in South Dakota

Sunflowers
Sow outdoors in Sioux Falls
Apr 26–May 17

Across South Dakota the window opens between April 26 and May 8. Find your city below; the dates follow each town's own average last frost.

Sow outdoors, Sioux Falls
Apr 26–May 17
Last sowing for a harvest
Jun 21
Last frost, Sioux Falls
Apr 26

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
Sioux FallsApr 26–May 17
Rapid CityMay 3–May 24
AberdeenMay 8–May 29
BrookingsMay 6–May 27
WatertownMay 7–May 28

Questions

When should I plant sunflowers in South Dakota?

In Sioux Falls, sow outdoors from April 26 to May 17. Across South Dakota the window opens between April 26 and May 8, 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 South Dakota

Sunflowers in other states

Frost dates for every city in South Dakota