When to plant onions in North Dakota

Plant out in Fargo

Mar 23–Apr 13

Across North Dakota the window opens between March 23 and April 9. Find your city below; the dates follow each town's own average last frost.

Start indoors, Fargo: Feb 9–Mar 9
Plant out, Fargo: Mar 23–Apr 13
Last frost, Fargo: May 4

Start seeds indoors 8–12 weeks before the last frost; plant out 3–6 weeks before the last frost. Northern gardens need long-day varieties and southern gardens need short-day ones. A wrong pick gives small bulbs.

Onions planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost

JanFebMarAprMayJunJulAugSepOctNovDec

FargoMar 23–Apr 13

BismarckMar 29–Apr 19

Grand ForksMar 29–Apr 19

MinotMar 29–Apr 19

West FargoMar 23–Apr 13

WillistonApr 9–Apr 30

DickinsonApr 8–Apr 29

MandanApr 1–Apr 22

Questions

When should I plant onions in North Dakota?

In Fargo, plant out from March 23 to April 13. Across North Dakota the window opens between March 23 and April 9, depending on the local last frost.

How is this date worked out?

Start seeds indoors 8–12 weeks before the last frost; plant out 3–6 weeks before the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for North Dakota

Onions in other states

Frost dates for every city in North Dakota