When to plant sunflowers in Washington

Sunflowers
Sow outdoors in Seattle
Mar 8–Mar 29

Across Washington the window opens between March 2 and May 8. Find your city below; the dates follow each town's own average last frost.

Sow outdoors, Seattle
Mar 8–Mar 29
Last sowing for a harvest
Aug 1
Last frost, Seattle
Mar 8

Sow outdoors up to 3 weeks after the last frost. Sow every two weeks until midsummer for flowers through fall.

Sunflowers planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
JanFebMarAprMayJunJulAugSepOctNovDec
SeattleMar 8–Mar 29
SpokaneApr 26–May 17
TacomaMar 8–Mar 29
VancouverMar 29–Apr 19
BellevueMar 8–Mar 29
KentMar 20–Apr 10
EverettMar 24–Apr 14
Spokane ValleyApr 26–May 17
RentonMar 13–Apr 3
Federal WayMar 8–Mar 29
YakimaApr 8–Apr 29
KirklandMar 8–Mar 29
BellinghamApr 1–Apr 22
KennewickMar 28–Apr 18
AuburnMar 20–Apr 10
PascoApr 27–May 18
RedmondMar 8–Mar 29
MarysvilleMar 24–Apr 14
South HillApr 11–May 2
ShorelineMar 8–Mar 29
SammamishMar 30–Apr 20
RichlandApr 6–Apr 27
LakewoodMar 11–Apr 1
LaceyApr 29–May 20
OlympiaApr 29–May 20
BothellMar 8–Mar 29
BurienMar 2–Mar 23
BremertonMar 29–Apr 19
EdmondsMar 9–Mar 30
PuyallupApr 11–May 2
All 76 cities
CitySow outdoorsLast frost
SeattleMar 8 to Mar 29Mar 8
SpokaneApr 26 to May 17Apr 26
TacomaMar 8 to Mar 29Mar 8
VancouverMar 29 to Apr 19Mar 29
BellevueMar 8 to Mar 29Mar 8
KentMar 20 to Apr 10Mar 20
EverettMar 24 to Apr 14Mar 24
Spokane ValleyApr 26 to May 17Apr 26
RentonMar 13 to Apr 3Mar 13
Federal WayMar 8 to Mar 29Mar 8
YakimaApr 8 to Apr 29Apr 8
KirklandMar 8 to Mar 29Mar 8
BellinghamApr 1 to Apr 22Apr 1
KennewickMar 28 to Apr 18Mar 28
AuburnMar 20 to Apr 10Mar 20
PascoApr 27 to May 18Apr 27
RedmondMar 8 to Mar 29Mar 8
MarysvilleMar 24 to Apr 14Mar 24
South HillApr 11 to May 2Apr 11
ShorelineMar 8 to Mar 29Mar 8
SammamishMar 30 to Apr 20Mar 30
RichlandApr 6 to Apr 27Apr 6
LakewoodMar 11 to Apr 1Mar 11
LaceyApr 29 to May 20Apr 29
OlympiaApr 29 to May 20Apr 29
BothellMar 8 to Mar 29Mar 8
BurienMar 2 to Mar 23Mar 2
BremertonMar 29 to Apr 19Mar 29
EdmondsMar 9 to Mar 30Mar 9
PuyallupApr 11 to May 2Apr 11
LynnwoodMar 9 to Mar 30Mar 9
Lake StevensMar 24 to Apr 14Mar 24
IssaquahMar 13 to Apr 3Mar 13
ParklandMar 8 to Mar 29Mar 8
LongviewApr 8 to Apr 29Apr 8
WenatcheeApr 4 to Apr 25Apr 4
University PlaceMar 11 to Apr 1Mar 11
Mount VernonMar 24 to Apr 14Mar 24
GrahamApr 11 to May 2Apr 11
SeaTacMar 2 to Mar 23Mar 2
SpanawayApr 11 to May 2Apr 11
Walla WallaMar 27 to Apr 17Mar 27
PullmanMay 6 to May 27May 6
Des MoinesMar 2 to Mar 23Mar 2
OrchardsApr 26 to May 17Apr 26
Maple ValleyApr 20 to May 11Apr 20
TumwaterApr 29 to May 20Apr 29
CamasMar 16 to Apr 6Mar 16
Moses LakeApr 27 to May 18Apr 27
Mill Creek EastMar 9 to Mar 30Mar 9
Mountlake TerraceMar 8 to Mar 29Mar 8
Mercer IslandMar 13 to Apr 3Mar 13
Bainbridge IslandMar 29 to Apr 19Mar 29
KenmoreMar 8 to Mar 29Mar 8
FredericksonApr 11 to May 2Apr 11
Oak HarborMar 13 to Apr 3Mar 13
North LynnwoodMar 9 to Mar 30Mar 9
Battle GroundApr 26 to May 17Apr 26
EastmontMar 9 to Mar 30Mar 9
Union Hill-Novelty HillMar 8 to Mar 29Mar 8
Cottage LakeApr 17 to May 8Apr 17
Hazel DellApr 26 to May 17Apr 26
Martha LakeMar 9 to Mar 30Mar 9
Bonney LakeApr 11 to May 2Apr 11
ArlingtonApr 22 to May 13Apr 22
TukwilaMar 2 to Mar 23Mar 2
Silver FirsMar 9 to Mar 30Mar 9
CovingtonApr 20 to May 11Apr 20
Five CornersApr 26 to May 17Apr 26
EllensburgMay 8 to May 29May 8
MukilteoMar 9 to Mar 30Mar 9
SilverdaleMar 29 to Apr 19Mar 29
Bothell WestMar 9 to Mar 30Mar 9
Mill CreekMar 9 to Mar 30Mar 9
Port AngelesMar 12 to Apr 2Mar 12
MonroeApr 17 to May 8Apr 17

Questions

When should I plant sunflowers in Washington?

In Seattle, sow outdoors from March 8 to March 29. Across Washington the window opens between March 2 and May 8, depending on the local last frost.

How is this date worked out?

Sow outdoors up to 3 weeks after the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for Washington

Sunflowers in other states

Frost dates for every city in Washington