When to plant onions in Missouri

Onions
Plant out in Kansas City
Feb 21–Mar 14

Across Missouri the window opens between February 18 and March 8. Find your city below; the dates follow each town's own average last frost.

Start indoors, Kansas City
Jan 10–Feb 7
Plant out, Kansas City
Feb 21–Mar 14
Last frost, Kansas City
Apr 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
Kansas CityFeb 21–Mar 14
St. LouisFeb 18–Mar 11
SpringfieldFeb 21–Mar 14
ColumbiaFeb 22–Mar 15
IndependenceFeb 27–Mar 20
Lee's SummitFeb 24–Mar 17
O'FallonFeb 27–Mar 20
St. CharlesFeb 25–Mar 18
St. JosephMar 8–Mar 29
Blue SpringsFeb 24–Mar 17
St. PetersFeb 26–Mar 19
JoplinFeb 26–Mar 19
FlorissantFeb 19–Mar 12
WentzvilleFeb 27–Mar 20
ChesterfieldFeb 21–Mar 14
Jefferson CityFeb 25–Mar 18
Cape GirardeauFeb 22–Mar 15
OakvilleFeb 23–Mar 16
WildwoodMar 1–Mar 22
University CityFeb 18–Mar 11
LibertyMar 8–Mar 29
BallwinFeb 21–Mar 14
KirkwoodFeb 18–Mar 11
RaytownFeb 24–Mar 17
MehlvilleFeb 23–Mar 16
Maryland HeightsFeb 21–Mar 14
GladstoneFeb 21–Mar 14
GrandviewFeb 24–Mar 17
RaymoreMar 2–Mar 23
NixaMar 4–Mar 25
All 41 cities
CityStart indoorsPlant outLast frost
Kansas CityJan 10 to Feb 7Feb 21 to Mar 14Apr 4
St. LouisJan 7 to Feb 4Feb 18 to Mar 11Apr 1
SpringfieldJan 10 to Feb 7Feb 21 to Mar 14Apr 4
ColumbiaJan 11 to Feb 8Feb 22 to Mar 15Apr 5
IndependenceJan 16 to Feb 13Feb 27 to Mar 20Apr 10
Lee's SummitJan 13 to Feb 10Feb 24 to Mar 17Apr 7
O'FallonJan 16 to Feb 13Feb 27 to Mar 20Apr 10
St. CharlesJan 14 to Feb 11Feb 25 to Mar 18Apr 8
St. JosephJan 25 to Feb 22Mar 8 to Mar 29Apr 19
Blue SpringsJan 13 to Feb 10Feb 24 to Mar 17Apr 7
St. PetersJan 15 to Feb 12Feb 26 to Mar 19Apr 9
JoplinJan 15 to Feb 12Feb 26 to Mar 19Apr 9
FlorissantJan 8 to Feb 5Feb 19 to Mar 12Apr 2
WentzvilleJan 16 to Feb 13Feb 27 to Mar 20Apr 10
ChesterfieldJan 10 to Feb 7Feb 21 to Mar 14Apr 4
Jefferson CityJan 14 to Feb 11Feb 25 to Mar 18Apr 8
Cape GirardeauJan 11 to Feb 8Feb 22 to Mar 15Apr 5
OakvilleJan 12 to Feb 9Feb 23 to Mar 16Apr 6
WildwoodJan 18 to Feb 15Mar 1 to Mar 22Apr 12
University CityJan 7 to Feb 4Feb 18 to Mar 11Apr 1
LibertyJan 25 to Feb 22Mar 8 to Mar 29Apr 19
BallwinJan 10 to Feb 7Feb 21 to Mar 14Apr 4
KirkwoodJan 7 to Feb 4Feb 18 to Mar 11Apr 1
RaytownJan 13 to Feb 10Feb 24 to Mar 17Apr 7
MehlvilleJan 12 to Feb 9Feb 23 to Mar 16Apr 6
Maryland HeightsJan 10 to Feb 7Feb 21 to Mar 14Apr 4
GladstoneJan 10 to Feb 7Feb 21 to Mar 14Apr 4
GrandviewJan 13 to Feb 10Feb 24 to Mar 17Apr 7
RaymoreJan 19 to Feb 16Mar 2 to Mar 23Apr 13
NixaJan 21 to Feb 18Mar 4 to Mar 25Apr 15
BeltonJan 19 to Feb 16Mar 2 to Mar 23Apr 13
HazelwoodJan 8 to Feb 5Feb 19 to Mar 12Apr 2
OzarkJan 21 to Feb 18Mar 4 to Mar 25Apr 15
Webster GrovesJan 7 to Feb 4Feb 18 to Mar 11Apr 1
SedaliaJan 24 to Feb 21Mar 7 to Mar 28Apr 18
RepublicJan 15 to Feb 12Feb 26 to Mar 19Apr 9
Old JamestownJan 8 to Feb 5Feb 19 to Mar 12Apr 2
ArnoldJan 15 to Feb 12Feb 26 to Mar 19Apr 9
RollaJan 11 to Feb 8Feb 22 to Mar 15Apr 5
WarrensburgJan 20 to Feb 17Mar 3 to Mar 24Apr 14
AfftonJan 7 to Feb 4Feb 18 to Mar 11Apr 1

Questions

When should I plant onions in Missouri?

In Kansas City, plant out from February 21 to March 14. Across Missouri the window opens between February 18 and March 8, 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 Missouri

Onions in other states

Frost dates for every city in Missouri