When to plant Cauliflower in Illinois

In spring, from Feb 20 – Mar 20 in Alton to Apr 10 – May 10 in Zion.

In fall, from June 1 – July 25 in Bartlett to Aug 1 – Sept 1 in Wood River.

Dates are for setting out plants. USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.

Cauliflower planting dates by place in Illinois
PlaceSpringFall
AddisonMar 15 – Apr 20July 15 – Aug 15
AlgonquinApr 10 – May 10July 1 – Aug 5
AlsipMar 1 – 20July 15 – Aug 15
AltonFeb 20 – Mar 20Aug 1 – Sept 1
AntiochMar 15 – Apr 20July 1 – Aug 5
Arlington HeightsMar 15 – Apr 20July 15 – Aug 15
AuroraMar 15 – Apr 20July 1 – Aug 5
BarringtonMar 15 – Apr 20July 1 – Aug 5
BartlettApr 10 – May 10June 1 – July 25
BataviaMar 15 – Apr 20July 1 – Aug 5
Beach ParkApr 10 – May 10July 1 – Aug 5
BellevilleMar 1 – 20July 1 – Aug 5
BellwoodMar 15 – Apr 20July 15 – Aug 15
BelvidereMar 15 – Apr 20July 1 – Aug 5
BensenvilleMar 15 – Apr 20July 15 – Aug 15
BerwynMar 1 – 20July 15 – Aug 15
BloomingdaleApr 10 – May 10June 1 – July 25
BloomingtonMar 15 – Apr 20July 1 – Aug 5
Blue IslandMar 1 – 20July 15 – Aug 15
BolingbrookMar 15 – Apr 20July 1 – Aug 5
BourbonnaisMar 15 – Apr 20July 1 – Aug 5
BradleyMar 15 – Apr 20July 1 – Aug 5
BridgeviewMar 1 – 20July 15 – Aug 15
BrookfieldMar 1 – 20July 15 – Aug 15
Buffalo GroveMar 15 – Apr 20July 15 – Aug 15
BurbankMar 1 – 20July 15 – Aug 15
Burr RidgeMar 15 – Apr 20July 1 – Aug 5
Cahokia HeightsMar 1 – 20July 15 – Aug 15
Calumet CityMar 15 – Apr 20July 1 – Aug 5
Campton HillsMar 15 – Apr 20July 1 – Aug 5
CantonMar 15 – Apr 20July 1 – Aug 5
CarbondaleMar 1 – 20July 1 – Aug 5
Carol StreamMar 15 – Apr 20July 1 – Aug 5
CarpentersvilleApr 10 – May 10July 1 – Aug 5
CaryApr 10 – May 10June 1 – July 25
CentraliaMar 1 – 20July 1 – Aug 5
ChampaignMar 1 – 20July 1 – Aug 5
ChannahonMar 15 – Apr 20July 15 – Aug 15
CharlestonMar 1 – 20July 1 – Aug 5
ChathamMar 1 – 20July 1 – Aug 5
ChicagoMar 1 – 20Aug 1 – Sept 1
Chicago HeightsMar 15 – Apr 20July 1 – Aug 5
Chicago RidgeMar 1 – 20July 15 – Aug 15
CiceroMar 1 – 20July 15 – Aug 15
CollinsvilleMar 1 – 20July 15 – Aug 15
ColumbiaMar 1 – 20July 15 – Aug 15
Country Club HillsMar 15 – Apr 20July 1 – Aug 5
Crest HillMar 15 – Apr 20July 1 – Aug 5
CrestwoodMar 1 – 20July 15 – Aug 15
Crystal LakeMar 15 – Apr 20July 1 – Aug 5
DanvilleMar 15 – Apr 20July 1 – Aug 5
DarienMar 15 – Apr 20July 1 – Aug 5
DecaturMar 1 – 20July 1 – Aug 5
DeerfieldApr 10 – May 10July 1 – Aug 5
DeKalbMar 15 – Apr 20July 1 – Aug 5
Des PlainesMar 15 – Apr 20July 15 – Aug 15
DixonMar 15 – Apr 20July 1 – Aug 5
DoltonMar 15 – Apr 20July 1 – Aug 5
Downers GroveApr 10 – May 10July 1 – Aug 5
East MolineMar 15 – Apr 20July 1 – Aug 5
East PeoriaMar 15 – Apr 20July 1 – Aug 5
East St. LouisMar 1 – 20July 15 – Aug 15
EdwardsvilleFeb 20 – Mar 20Aug 1 – Sept 1
EffinghamMar 1 – 20July 1 – Aug 5
ElginApr 10 – May 10July 1 – Aug 5
Elk Grove VillageMar 15 – Apr 20July 15 – Aug 15
ElmhurstMar 15 – Apr 20July 15 – Aug 15
Elmwood ParkMar 15 – Apr 20July 15 – Aug 15
EvanstonApr 10 – May 10July 1 – Aug 5
Evergreen ParkMar 1 – 20July 15 – Aug 15
Fairview HeightsMar 1 – 20July 15 – Aug 15
Forest ParkMar 1 – 20July 15 – Aug 15
Fox LakeMar 15 – Apr 20July 1 – Aug 5
FrankfortMar 15 – Apr 20July 1 – Aug 5
Franklin ParkMar 15 – Apr 20July 15 – Aug 15
FreeportApr 10 – May 10June 1 – July 25
GalesburgMar 15 – Apr 20July 1 – Aug 5
GenevaMar 15 – Apr 20July 1 – Aug 5
Glen CarbonFeb 20 – Mar 20Aug 1 – Sept 1
Glen EllynApr 10 – May 10July 1 – Aug 5
Glendale HeightsApr 10 – May 10July 1 – Aug 5
GlenviewApr 10 – May 10July 1 – Aug 5
GodfreyFeb 20 – Mar 20Aug 1 – Sept 1
Granite CityFeb 20 – Mar 20Aug 1 – Sept 1
GrayslakeApr 10 – May 10July 1 – Aug 5
GurneeApr 10 – May 10July 1 – Aug 5
Hanover ParkApr 10 – May 10June 1 – July 25
HarveyMar 15 – Apr 20July 1 – Aug 5
Hazel CrestMar 15 – Apr 20July 1 – Aug 5
HerrinMar 1 – 20July 1 – Aug 5
Hickory HillsMar 15 – Apr 20July 1 – Aug 5
HighlandMar 1 – 20July 1 – Aug 5
Highland ParkApr 10 – May 10July 1 – Aug 5
HinsdaleMar 15 – Apr 20July 1 – Aug 5
Hoffman EstatesApr 10 – May 10June 1 – July 25
Homer GlenMar 15 – Apr 20July 1 – Aug 5
HomewoodMar 15 – Apr 20July 1 – Aug 5
HuntleyMar 15 – Apr 20July 1 – Aug 5
JacksonvilleMar 15 – Apr 20July 1 – Aug 5
JolietMar 15 – Apr 20July 1 – Aug 5
JusticeMar 1 – 20July 15 – Aug 15
KankakeeMar 15 – Apr 20July 1 – Aug 5
KewaneeMar 15 – Apr 20July 1 – Aug 5
La GrangeMar 1 – 20July 15 – Aug 15
La Grange ParkMar 1 – 20July 15 – Aug 15
Lake ForestApr 10 – May 10July 1 – Aug 5
Lake in the HillsMar 15 – Apr 20July 1 – Aug 5
Lake ZurichApr 10 – May 10July 1 – Aug 5
LansingMar 15 – Apr 20July 1 – Aug 5
LemontMar 15 – Apr 20July 1 – Aug 5
LibertyvilleApr 10 – May 10July 1 – Aug 5
LincolnMar 15 – Apr 20July 1 – Aug 5
LincolnwoodApr 10 – May 10July 1 – Aug 5
LindenhurstMar 15 – Apr 20July 1 – Aug 5
LisleApr 10 – May 10July 1 – Aug 5
LockportMar 15 – Apr 20July 1 – Aug 5
LombardApr 10 – May 10July 1 – Aug 5
Loves ParkMar 15 – Apr 20July 1 – Aug 5
LyonsMar 1 – 20July 15 – Aug 15
Machesney ParkApr 10 – May 10June 1 – July 25
MacombMar 15 – Apr 20July 1 – Aug 5
MahometMar 15 – Apr 20June 1 – July 25
ManhattanMar 15 – Apr 20July 1 – Aug 5
MarionMar 1 – 20July 1 – Aug 5
MarkhamMar 15 – Apr 20July 1 – Aug 5
MattesonMar 15 – Apr 20July 1 – Aug 5
MattoonMar 1 – 20July 15 – Aug 15
MaywoodMar 1 – 20July 15 – Aug 15
McHenryApr 10 – May 10June 1 – July 25
Melrose ParkMar 15 – Apr 20July 15 – Aug 15
MidlothianMar 1 – 20July 15 – Aug 15
MinookaMar 15 – Apr 20July 15 – Aug 15
MokenaMar 15 – Apr 20July 1 – Aug 5
MolineMar 15 – Apr 20July 1 – Aug 5
MontgomeryMar 15 – Apr 20July 1 – Aug 5
MorrisMar 15 – Apr 20July 1 – Aug 5
MortonMar 15 – Apr 20July 1 – Aug 5
Morton GroveApr 10 – May 10July 1 – Aug 5
Mount ProspectMar 15 – Apr 20July 15 – Aug 15
Mount VernonMar 1 – 20July 1 – Aug 5
MundeleinApr 10 – May 10July 1 – Aug 5
NapervilleApr 10 – May 10July 1 – Aug 5
New LenoxMar 15 – Apr 20July 1 – Aug 5
NilesMar 15 – Apr 20July 15 – Aug 15
NormalMar 15 – Apr 20July 1 – Aug 5
NorridgeMar 15 – Apr 20July 15 – Aug 15
North AuroraMar 15 – Apr 20July 1 – Aug 5
North ChicagoApr 10 – May 10July 1 – Aug 5
NorthbrookApr 10 – May 10July 1 – Aug 5
NorthlakeMar 15 – Apr 20July 15 – Aug 15
O'FallonMar 1 – 20July 1 – Aug 5
Oak ForestMar 15 – Apr 20July 1 – Aug 5
Oak LawnMar 1 – 20July 15 – Aug 15
Oak ParkMar 1 – 20July 15 – Aug 15
Orland ParkMar 15 – Apr 20July 1 – Aug 5
OswegoMar 15 – Apr 20July 1 – Aug 5
OttawaApr 10 – May 10July 1 – Aug 5
PalatineMar 15 – Apr 20July 1 – Aug 5
Palos HeightsMar 1 – 20July 15 – Aug 15
Palos HillsMar 15 – Apr 20July 1 – Aug 5
Park ForestMar 15 – Apr 20July 1 – Aug 5
Park RidgeMar 15 – Apr 20July 15 – Aug 15
PekinMar 15 – Apr 20July 1 – Aug 5
PeoriaMar 15 – Apr 20July 1 – Aug 5
Pingree GroveApr 10 – May 10July 1 – Aug 5
PlainfieldMar 15 – Apr 20July 1 – Aug 5
PlanoApr 10 – May 10June 1 – July 25
PontiacMar 15 – Apr 20July 1 – Aug 5
Prospect HeightsMar 15 – Apr 20July 15 – Aug 15
QuincyMar 1 – 20July 15 – Aug 15
RantoulMar 15 – Apr 20July 1 – Aug 5
Richton ParkMar 15 – Apr 20July 1 – Aug 5
River ForestMar 1 – 20July 15 – Aug 15
River GroveMar 15 – Apr 20July 15 – Aug 15
RiverdaleMar 1 – 20July 15 – Aug 15
Rock IslandMar 15 – Apr 20July 1 – Aug 5
RockfordMar 15 – Apr 20July 1 – Aug 5
Rolling MeadowsMar 15 – Apr 20July 15 – Aug 15
RomeovilleMar 15 – Apr 20July 1 – Aug 5
RoscoeApr 10 – May 10June 1 – July 25
RoselleApr 10 – May 10June 1 – July 25
Round LakeApr 10 – May 10July 1 – Aug 5
Round Lake BeachMar 15 – Apr 20July 1 – Aug 5
SchaumburgApr 10 – May 10June 1 – July 25
Schiller ParkMar 15 – Apr 20July 15 – Aug 15
ShilohMar 1 – 20July 1 – Aug 5
ShorewoodMar 15 – Apr 20July 1 – Aug 5
SkokieApr 10 – May 10July 1 – Aug 5
South ElginApr 10 – May 10July 1 – Aug 5
South HollandMar 15 – Apr 20July 1 – Aug 5
SpringfieldMar 1 – 20July 1 – Aug 5
St. CharlesMar 15 – Apr 20July 1 – Aug 5
SterlingMar 15 – Apr 20July 1 – Aug 5
StreamwoodApr 10 – May 10June 1 – July 25
StreatorMar 1 – 20July 15 – Aug 15
SummitMar 1 – 20July 15 – Aug 15
SwanseaMar 1 – 20July 1 – Aug 5
SycamoreMar 15 – Apr 20July 1 – Aug 5
TaylorvilleMar 1 – 20July 1 – Aug 5
Tinley ParkMar 15 – Apr 20July 1 – Aug 5
TroyMar 1 – 20July 1 – Aug 5
UrbanaMar 1 – 20July 1 – Aug 5
Vernon HillsApr 10 – May 10July 1 – Aug 5
Villa ParkApr 10 – May 10July 1 – Aug 5
WarrenvilleApr 10 – May 10July 1 – Aug 5
WashingtonMar 15 – Apr 20July 1 – Aug 5
WaterlooMar 1 – 20July 15 – Aug 15
WaucondaApr 10 – May 10July 1 – Aug 5
WaukeganApr 10 – May 10July 1 – Aug 5
West ChicagoMar 15 – Apr 20July 1 – Aug 5
WestchesterMar 1 – 20July 15 – Aug 15
Western SpringsMar 15 – Apr 20July 1 – Aug 5
WestmontApr 10 – May 10July 1 – Aug 5
WheatonApr 10 – May 10July 1 – Aug 5
WheelingMar 15 – Apr 20July 15 – Aug 15
WilmetteApr 10 – May 10July 1 – Aug 5
WinfieldMar 15 – Apr 20July 1 – Aug 5
WinnetkaApr 10 – May 10July 1 – Aug 5
Wood DaleMar 15 – Apr 20July 15 – Aug 15
Wood RiverFeb 20 – Mar 20Aug 1 – Sept 1
WoodridgeApr 10 – May 10July 1 – Aug 5
WoodstockMar 15 – Apr 20July 1 – Aug 5
WorthMar 1 – 20July 15 – Aug 15
YorkvilleApr 10 – May 10June 1 – July 25
ZionApr 10 – May 10July 1 – Aug 5

Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. The full USDA table for cauliflower.