When to plant onions in Kansas

Plant out in Wichita

Feb 28–Mar 21

Across Kansas the window opens between February 21 and March 17. Find your city below; the dates follow each town's own average last frost.

Start indoors, Wichita: Jan 17–Feb 14
Plant out, Wichita: Feb 28–Mar 21
Last frost, Wichita: Apr 11

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

WichitaFeb 28–Mar 21

Overland ParkFeb 27–Mar 20

Kansas CityFeb 21–Mar 14

OlatheFeb 27–Mar 20

TopekaMar 5–Mar 26

LawrenceMar 1–Mar 22

ShawneeMar 5–Mar 26

LenexaFeb 27–Mar 20

ManhattanMar 5–Mar 26

SalinaMar 7–Mar 28

HutchinsonMar 7–Mar 28

LeavenworthMar 1–Mar 22

LeawoodFeb 25–Mar 18

Dodge CityMar 10–Mar 31

Garden CityMar 17–Apr 7

DerbyMar 3–Mar 24

GardnerMar 2–Mar 23

EmporiaMar 4–Mar 25

Prairie VillageFeb 21–Mar 14

Junction CityMar 1–Mar 22

HaysMar 8–Mar 29

PittsburgFeb 24–Mar 17

Questions

When should I plant onions in Kansas?

In Wichita, plant out from February 28 to March 21. Across Kansas the window opens between February 21 and March 17, 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 Kansas

Onions in other states

Frost dates for every city in Kansas