When to plant Sweet corn in Washington

In spring, from Mar 1 – Apr 15 in Burien to May 20 – June 1 in Cheney.

In fall, June 1 – Aug 15.

USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.

Sweet corn planting dates by place in Washington
PlaceSpringFall
AberdeenMar 25 – May 15June 1 – Aug 15
Airway HeightsMay 10 – June 15June 1 – July 10
AnacortesMar 10 – Apr 15June 1 – Sept 1
ArlingtonApr 25 – June 15June 1 – July 20
AuburnMar 15 – May 1June 1 – Aug 15
Bainbridge IslandMar 25 – May 15June 1 – Aug 15
Battle GroundMay 10 – June 15June 1 – July 20
BellevueMar 10 – Apr 15June 1 – Sept 1
BellinghamMar 25 – May 15June 1 – Aug 1
Bonney LakeApr 10 – June 1June 1 – Aug 1
BothellMar 10 – Apr 15June 1 – Sept 1
BremertonMar 25 – May 15June 1 – Aug 15
BurienMar 1 – Apr 15June 1 – Sept 1
BurlingtonMar 15 – May 1June 1 – Aug 1
CamasMar 15 – May 1June 1 – Sept 1
CentraliaApr 25 – June 15June 1 – Aug 1
CheneyMay 20 – June 1Not listed
CovingtonApr 25 – June 15June 1 – July 20
Des MoinesMar 1 – Apr 15June 1 – Sept 1
East WenatcheeMar 25 – May 15June 1 – Aug 1
EdgewoodMar 10 – Apr 15June 1 – Aug 15
EdmondsMar 10 – Apr 15June 1 – Sept 1
EllensburgMay 10 – June 1June 1 – July 1
EnumclawApr 10 – June 1June 1 – Aug 1
EverettMar 15 – May 1June 1 – Aug 1
Federal WayMar 10 – Apr 15June 1 – Aug 15
FerndaleMar 25 – May 15June 1 – Aug 1
FifeMar 10 – Apr 15June 1 – Aug 15
Gig HarborMar 10 – Apr 15June 1 – Sept 1
GrandviewMay 10 – June 15June 1 – July 10
IssaquahMar 10 – Apr 15June 1 – Sept 1
KelsoApr 10 – June 1June 1 – Aug 15
KenmoreMar 10 – Apr 15June 1 – Sept 1
KennewickMar 25 – May 15June 1 – Aug 1
KentMar 15 – May 1June 1 – Aug 15
KirklandMar 10 – Apr 15June 1 – Sept 1
LaceyMay 10 – June 15June 1 – July 10
Lake Forest ParkMar 10 – Apr 15June 1 – Sept 1
Lake StevensMar 15 – May 1June 1 – Aug 1
LakewoodMar 10 – Apr 15June 1 – Sept 1
Liberty LakeMay 10 – June 15June 1 – July 10
LongviewApr 10 – June 1June 1 – Aug 15
LyndenApr 25 – June 15June 1 – July 20
LynnwoodMar 10 – Apr 15June 1 – Sept 1
Maple ValleyApr 25 – June 15June 1 – July 20
MarysvilleMar 15 – May 1June 1 – Aug 1
Mercer IslandMar 10 – Apr 15June 1 – Sept 1
Mill CreekMar 10 – Apr 15June 1 – Sept 1
MonroeApr 25 – June 15June 1 – July 20
Moses LakeMay 10 – June 15June 1 – July 10
Mount VernonMar 15 – May 1June 1 – Aug 1
Mountlake TerraceMar 10 – Apr 15June 1 – Sept 1
MukilteoMar 10 – Apr 15June 1 – Sept 1
NewcastleMar 10 – Apr 15June 1 – Sept 1
Oak HarborMar 10 – Apr 15June 1 – Aug 15
OlympiaMay 10 – June 15June 1 – July 10
PascoMay 10 – June 15June 1 – July 10
Port AngelesMar 10 – Apr 15June 1 – Sept 1
Port OrchardMar 25 – May 15June 1 – Aug 15
Port TownsendMar 1 – Apr 15Not listed
PoulsboMar 25 – May 15June 1 – Aug 15
PullmanMay 10 – June 1June 1 – July 1
PuyallupApr 10 – June 1June 1 – Aug 1
RedmondMar 10 – Apr 15June 1 – Sept 1
RentonMar 10 – Apr 15June 1 – Sept 1
RichlandApr 10 – June 1June 1 – July 20
RidgefieldMay 10 – June 15June 1 – July 20
SammamishMar 25 – May 15June 1 – Aug 15
SeaTacMar 1 – Apr 15June 1 – Sept 1
SeattleMar 10 – Apr 15June 1 – Sept 1
Sedro-WoolleyMar 25 – May 15June 1 – Aug 15
SheltonMay 10 – June 15June 1 – July 20
ShorelineMar 10 – Apr 15June 1 – Sept 1
SnohomishMar 15 – May 1June 1 – Aug 1
SnoqualmieMar 25 – May 15June 1 – Aug 15
SpokaneMay 10 – June 15June 1 – July 10
Spokane ValleyMay 10 – June 15June 1 – July 10
SumnerApr 10 – June 1June 1 – Aug 1
SunnysideMay 10 – June 15June 1 – July 10
TacomaMar 10 – Apr 15June 1 – Aug 15
TukwilaMar 1 – Apr 15June 1 – Sept 1
TumwaterMay 10 – June 15June 1 – July 10
University PlaceMar 10 – Apr 15June 1 – Sept 1
VancouverMar 25 – May 15June 1 – Aug 15
Walla WallaMar 25 – May 15June 1 – Aug 1
WashougalMar 25 – May 15June 1 – Sept 1
WenatcheeMar 25 – May 15June 1 – Aug 1
West RichlandApr 10 – June 1June 1 – July 20
WoodinvilleMar 10 – Apr 15June 1 – Sept 1
YakimaApr 10 – June 1June 1 – July 20
YelmMay 10 – June 15June 1 – July 10

Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. “—” means the place's frost date is outside the table. The full USDA table for sweet corn.