FrostCal

When to Plant Zucchini in Washington

In a typical Washington location, start seeds indoors Mar 3 – Mar 10, then sow outdoors Mar 31 – Apr 14, then transplant outdoors Mar 31 – Apr 7. Across the state, the outdoor planting window starts as early as Mar 8 in Port Townsend and as late as Jun 6 in Cheney.

Method Direct sow
Days to maturity 45–55 days

Fast-growing squash; direct sow 1-3 weeks after last frost, or start indoors 2-3 weeks early for a head start.

Zucchini Planting Dates by City

CityStart indoorsDirect sowTransplant
SeattleFeb 20 – Feb 27Mar 20 – Apr 3Mar 20 – Mar 27
Tri-CitiesApr 6 – Apr 13May 4 – May 18May 4 – May 11
SpokaneApr 5 – Apr 12May 3 – May 17May 3 – May 10
TacomaFeb 15 – Feb 22Mar 15 – Mar 29Mar 15 – Mar 22
VancouverMar 8 – Mar 15Apr 5 – Apr 19Apr 5 – Apr 12
BellevueFeb 15 – Feb 22Mar 15 – Mar 29Mar 15 – Mar 22
KentFeb 27 – Mar 6Mar 27 – Apr 10Mar 27 – Apr 3
EverettMar 3 – Mar 10Mar 31 – Apr 14Mar 31 – Apr 7
RentonFeb 20 – Feb 27Mar 20 – Apr 3Mar 20 – Mar 27
Federal WayFeb 15 – Feb 22Mar 15 – Mar 29Mar 15 – Mar 22
Spokane ValleyApr 5 – Apr 12May 3 – May 17May 3 – May 10
YakimaApr 17 – Apr 24May 15 – May 29May 15 – May 22
KirklandFeb 15 – Feb 22Mar 15 – Mar 29Mar 15 – Mar 22
BellinghamMar 11 – Mar 18Apr 8 – Apr 22Apr 8 – Apr 15
KennewickMar 7 – Mar 14Apr 4 – Apr 18Apr 4 – Apr 11
AuburnFeb 27 – Mar 6Mar 27 – Apr 10Mar 27 – Apr 3
PascoMar 7 – Mar 14Apr 4 – Apr 18Apr 4 – Apr 11
MarysvilleMar 3 – Mar 10Mar 31 – Apr 14Mar 31 – Apr 7
RedmondFeb 15 – Feb 22Mar 15 – Mar 29Mar 15 – Mar 22
LakewoodFeb 18 – Feb 25Mar 18 – Apr 1Mar 18 – Mar 25
OlympiaApr 8 – Apr 15May 6 – May 20May 6 – May 13
ShorelineFeb 15 – Feb 22Mar 15 – Mar 29Mar 15 – Mar 22
RichlandMar 16 – Mar 23Apr 13 – Apr 27Apr 13 – Apr 20
South HillMar 21 – Mar 28Apr 18 – May 2Apr 18 – Apr 25
SammamishFeb 15 – Feb 22Mar 15 – Mar 29Mar 15 – Mar 22
BurienFeb 9 – Feb 16Mar 9 – Mar 23Mar 9 – Mar 16
LaceyApr 8 – Apr 15May 6 – May 20May 6 – May 13
City of SammamishMar 9 – Mar 16Apr 6 – Apr 20Apr 6 – Apr 13
BothellFeb 15 – Feb 22Mar 15 – Mar 29Mar 15 – Mar 22
EdmondsFeb 16 – Feb 23Mar 16 – Mar 30Mar 16 – Mar 23

Showing the 30 most populous of 133 Washington cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all Washington cities.

Frequently Asked Questions

When should I plant zucchini in Washington?

In a typical Washington location, start seeds indoors Mar 3 – Mar 10, then sow outdoors Mar 31 – Apr 14, then transplant outdoors Mar 31 – Apr 7. Across the state, the outdoor planting window starts as early as Mar 8 in Port Townsend and as late as Jun 6 in Cheney.

When is the last frost in Washington?

The average last spring frost in Washington ranges from March 1 in Port Townsend to May 30 in Cheney, based on NOAA 1991–2020 climate normals.

How long do zucchini take to grow?

Zucchini typically take 45–55 days from planting to harvest. Fast-growing squash; direct sow 1-3 weeks after last frost, or start indoors 2-3 weeks early for a head start.

Other Crops in Washington

When to plant zucchini in other states

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