When to plant Spinach in Washington

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

In fall, from May 15 – July 1 in Cheney to Oct 1 – Dec 1 in Woodinville.

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

Spinach planting dates by place in Washington
PlaceSpringFall
AberdeenFeb 1 – Mar 20Sept 15 – Nov 1Now
Airway HeightsMar 20 – Apr 20Aug 1 – Sept 1
AnacortesJan 15 – Mar 10Oct 1 – Dec 1Now
ArlingtonMar 1 – Apr 15Aug 20 – Sept 10
AuburnJan 15 – Mar 15Sept 15 – Nov 1Now
Bainbridge IslandFeb 1 – Mar 20Sept 15 – Nov 1Now
Battle GroundMar 20 – Apr 20Aug 20 – Sept 10
BellevueJan 15 – Mar 10Oct 1 – Dec 1Now
BellinghamFeb 1 – Mar 20Sept 1 – Oct 1
Bonney LakeFeb 15 – Apr 1Sept 1 – Oct 1
BothellJan 15 – Mar 10Oct 1 – Dec 1Now
BremertonFeb 1 – Mar 20Sept 15 – Nov 1Now
BurienJan 1 – Mar 1Oct 1 – Dec 1Now
BurlingtonJan 15 – Mar 15Sept 1 – Oct 1
CamasJan 15 – Mar 15Oct 1 – Dec 1Now
CentraliaMar 1 – Apr 15Sept 1 – Oct 1
CheneyApr 20 – June 15May 15 – July 1
CovingtonMar 1 – Apr 15Aug 20 – Sept 10
Des MoinesJan 1 – Mar 1Oct 1 – Dec 1Now
East WenatcheeFeb 1 – Mar 20Sept 1 – Oct 1
EdgewoodJan 15 – Mar 10Sept 15 – Nov 1Now
EdmondsJan 15 – Mar 10Oct 1 – Dec 1Now
EllensburgApr 1 – June 15July 1 – Aug 15
EnumclawFeb 15 – Apr 1Sept 1 – Oct 1
EverettJan 15 – Mar 15Sept 1 – Oct 1
Federal WayJan 15 – Mar 10Sept 15 – Nov 1Now
FerndaleFeb 1 – Mar 20Sept 1 – Oct 1
FifeJan 15 – Mar 10Sept 15 – Nov 1Now
Gig HarborJan 15 – Mar 10Oct 1 – Dec 1Now
GrandviewMar 20 – Apr 20Aug 1 – Sept 1
IssaquahJan 15 – Mar 10Oct 1 – Dec 1Now
KelsoFeb 15 – Apr 1Sept 15 – Nov 1Now
KenmoreJan 15 – Mar 10Oct 1 – Dec 1Now
KennewickFeb 1 – Mar 20Sept 1 – Oct 1
KentJan 15 – Mar 15Sept 15 – Nov 1Now
KirklandJan 15 – Mar 10Oct 1 – Dec 1Now
LaceyMar 20 – Apr 20Aug 1 – Sept 1
Lake Forest ParkJan 15 – Mar 10Oct 1 – Dec 1Now
Lake StevensJan 15 – Mar 15Sept 1 – Oct 1
LakewoodJan 15 – Mar 10Oct 1 – Dec 1Now
Liberty LakeMar 20 – Apr 20Aug 1 – Sept 1
LongviewFeb 15 – Apr 1Sept 15 – Nov 1Now
LyndenMar 1 – Apr 15Aug 20 – Sept 10
LynnwoodJan 15 – Mar 10Oct 1 – Dec 1Now
Maple ValleyMar 1 – Apr 15Aug 20 – Sept 10
MarysvilleJan 15 – Mar 15Sept 1 – Oct 1
Mercer IslandJan 15 – Mar 10Oct 1 – Dec 1Now
Mill CreekJan 15 – Mar 10Oct 1 – Dec 1Now
MonroeMar 1 – Apr 15Aug 20 – Sept 10
Moses LakeMar 20 – Apr 20Aug 1 – Sept 1
Mount VernonJan 15 – Mar 15Sept 1 – Oct 1
Mountlake TerraceJan 15 – Mar 10Oct 1 – Dec 1Now
MukilteoJan 15 – Mar 10Oct 1 – Dec 1Now
NewcastleJan 15 – Mar 10Oct 1 – Dec 1Now
Oak HarborJan 15 – Mar 10Sept 15 – Nov 1Now
OlympiaMar 20 – Apr 20Aug 1 – Sept 1
PascoMar 20 – Apr 20Aug 1 – Sept 1
Port AngelesJan 15 – Mar 10Oct 1 – Dec 1Now
Port OrchardFeb 1 – Mar 20Sept 15 – Nov 1Now
Port TownsendJan 1 – Mar 1Oct 1 – Dec 31Now
PoulsboFeb 1 – Mar 20Sept 15 – Nov 1Now
PullmanApr 1 – June 15July 1 – Aug 15
PuyallupFeb 15 – Apr 1Sept 1 – Oct 1
RedmondJan 15 – Mar 10Oct 1 – Dec 1Now
RentonJan 15 – Mar 10Oct 1 – Dec 1Now
RichlandFeb 15 – Apr 1Aug 20 – Sept 10
RidgefieldMar 20 – Apr 20Aug 20 – Sept 10
SammamishFeb 1 – Mar 20Sept 15 – Nov 1Now
SeaTacJan 1 – Mar 1Oct 1 – Dec 1Now
SeattleJan 15 – Mar 10Oct 1 – Dec 1Now
Sedro-WoolleyFeb 1 – Mar 20Sept 15 – Nov 1Now
SheltonMar 20 – Apr 20Aug 20 – Sept 10
ShorelineJan 15 – Mar 10Oct 1 – Dec 1Now
SnohomishJan 15 – Mar 15Sept 1 – Oct 1
SnoqualmieFeb 1 – Mar 20Sept 15 – Nov 1Now
SpokaneMar 20 – Apr 20Aug 1 – Sept 1
Spokane ValleyMar 20 – Apr 20Aug 1 – Sept 1
SumnerFeb 15 – Apr 1Sept 1 – Oct 1
SunnysideMar 20 – Apr 20Aug 1 – Sept 1
TacomaJan 15 – Mar 10Sept 15 – Nov 1Now
TukwilaJan 1 – Mar 1Oct 1 – Dec 1Now
TumwaterMar 20 – Apr 20Aug 1 – Sept 1
University PlaceJan 15 – Mar 10Oct 1 – Dec 1Now
VancouverFeb 1 – Mar 20Sept 15 – Nov 1Now
Walla WallaFeb 1 – Mar 20Sept 1 – Oct 1
WashougalFeb 1 – Mar 20Oct 1 – Dec 1Now
WenatcheeFeb 1 – Mar 20Sept 1 – Oct 1
West RichlandFeb 15 – Apr 1Aug 20 – Sept 10
WoodinvilleJan 15 – Mar 10Oct 1 – Dec 1Now
YakimaFeb 15 – Apr 1Aug 20 – Sept 10
YelmMar 20 – Apr 20Aug 1 – Sept 1

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 spinach.