When to plant Sweet potatoes in Washington

In spring, from Mar 20 – June 1 in Burien to May 20 – June 10 in Yelm.

In fall, from May 20 – June 10 in Airway Heights to June 1 – 15 in Yakima.

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

Sweet potatoes planting dates by place in Washington
PlaceSpringFall
AberdeenApr 20 – June 1June 1 – July 1
Airway HeightsMay 20 – June 10May 20 – June 10
AnacortesApr 1 – June 1June 1 – July 1
ArlingtonMay 10 – June 10June 1 – 15
AuburnApr 10 – June 1June 1 – July 1
Bainbridge IslandApr 20 – June 1June 1 – July 1
Battle GroundMay 20 – June 10June 1 – 15
BellevueApr 1 – June 1June 1 – July 1
BellinghamApr 20 – June 1June 1 – 15
Bonney LakeMay 1 – June 1June 1 – 15
BothellApr 1 – June 1June 1 – July 1
BremertonApr 20 – June 1June 1 – July 1
BurienMar 20 – June 1June 1 – July 1
BurlingtonApr 10 – June 1June 1 – 15
CamasApr 10 – June 1June 1 – July 1
CentraliaMay 10 – June 10June 1 – 15
CheneyNot listedNot listed
CovingtonMay 10 – June 10June 1 – 15
Des MoinesMar 20 – June 1June 1 – July 1
East WenatcheeApr 20 – June 1June 1 – 15
EdgewoodApr 1 – June 1June 1 – July 1
EdmondsApr 1 – June 1June 1 – July 1
EllensburgNot listedNot listed
EnumclawMay 1 – June 1June 1 – 15
EverettApr 10 – June 1June 1 – 15
Federal WayApr 1 – June 1June 1 – July 1
FerndaleApr 20 – June 1June 1 – 15
FifeApr 1 – June 1June 1 – July 1
Gig HarborApr 1 – June 1June 1 – July 1
GrandviewMay 20 – June 10May 20 – June 10
IssaquahApr 1 – June 1June 1 – July 1
KelsoMay 1 – June 1June 1 – July 1
KenmoreApr 1 – June 1June 1 – July 1
KennewickApr 20 – June 1June 1 – 15
KentApr 10 – June 1June 1 – July 1
KirklandApr 1 – June 1June 1 – July 1
LaceyMay 20 – June 10May 20 – June 10
Lake Forest ParkApr 1 – June 1June 1 – July 1
Lake StevensApr 10 – June 1June 1 – 15
LakewoodApr 1 – June 1June 1 – July 1
Liberty LakeMay 20 – June 10May 20 – June 10
LongviewMay 1 – June 1June 1 – July 1
LyndenMay 10 – June 10June 1 – 15
LynnwoodApr 1 – June 1June 1 – July 1
Maple ValleyMay 10 – June 10June 1 – 15
MarysvilleApr 10 – June 1June 1 – 15
Mercer IslandApr 1 – June 1June 1 – July 1
Mill CreekApr 1 – June 1June 1 – July 1
MonroeMay 10 – June 10June 1 – 15
Moses LakeMay 20 – June 10May 20 – June 10
Mount VernonApr 10 – June 1June 1 – 15
Mountlake TerraceApr 1 – June 1June 1 – July 1
MukilteoApr 1 – June 1June 1 – July 1
NewcastleApr 1 – June 1June 1 – July 1
Oak HarborApr 1 – June 1June 1 – July 1
OlympiaMay 20 – June 10May 20 – June 10
PascoMay 20 – June 10May 20 – June 10
Port AngelesApr 1 – June 1June 1 – July 1
Port OrchardApr 20 – June 1June 1 – July 1
Port TownsendMar 20 – June 1June 1 – July 1
PoulsboApr 20 – June 1June 1 – July 1
PullmanNot listedNot listed
PuyallupMay 1 – June 1June 1 – 15
RedmondApr 1 – June 1June 1 – July 1
RentonApr 1 – June 1June 1 – July 1
RichlandMay 1 – June 1June 1 – 15
RidgefieldMay 20 – June 10June 1 – 15
SammamishApr 20 – June 1June 1 – July 1
SeaTacMar 20 – June 1June 1 – July 1
SeattleApr 1 – June 1June 1 – July 1
Sedro-WoolleyApr 20 – June 1June 1 – July 1
SheltonMay 20 – June 10June 1 – 15
ShorelineApr 1 – June 1June 1 – July 1
SnohomishApr 10 – June 1June 1 – 15
SnoqualmieApr 20 – June 1June 1 – July 1
SpokaneMay 20 – June 10May 20 – June 10
Spokane ValleyMay 20 – June 10May 20 – June 10
SumnerMay 1 – June 1June 1 – 15
SunnysideMay 20 – June 10May 20 – June 10
TacomaApr 1 – June 1June 1 – July 1
TukwilaMar 20 – June 1June 1 – July 1
TumwaterMay 20 – June 10May 20 – June 10
University PlaceApr 1 – June 1June 1 – July 1
VancouverApr 20 – June 1June 1 – July 1
Walla WallaApr 20 – June 1June 1 – 15
WashougalApr 20 – June 1June 1 – July 1
WenatcheeApr 20 – June 1June 1 – 15
West RichlandMay 1 – June 1June 1 – 15
WoodinvilleApr 1 – June 1June 1 – July 1
YakimaMay 1 – June 1June 1 – 15
YelmMay 20 – June 10May 20 – June 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 potatoes.