When to plant in West Lake Sammamish, WA

Planting dates worked out from West Lake Sammamish's own frost records, not a generic zone chart.

Safe to plant out

Apr 2

1 year in 10 has a later frost

Average last frost

Mar 14

about a 50% chance of a later one

Average first fall frost

Nov 14

1 year in 10 by Oct 28

Frost-free days

238

median, 1991–2020

Station used: Renton Muni Ap · 12.5 km away · station 6 m, town 9 m. How we match towns to stations

This season

Plan your garden.

Crop	Start indoors	Plant out or sow	Harvest from
Tomato	Mar 4 – Mar 18	Apr 29 – May 13	Jun 23
Sweet pepper	Feb 18 – Mar 4	Apr 29 – May 13	Jun 28
Lettuce (leaf)	Jan 10 – Jan 17	Feb 14 – Feb 28	Mar 26
Peas	—	Jan 31 – Feb 28	Mar 27
Bush beans	—	Apr 18 – May 9	Jun 7
Carrot	—	Mar 14 – Apr 25	May 13
Beet	—	Mar 14 – Apr 25	May 3
Potato	—	Mar 14 – Apr 4	May 23
Kale	Jan 3 – Jan 17	Feb 14 – Feb 28	Mar 29
Broccoli	Jan 3 – Jan 17	Feb 14 – Mar 7	Apr 15
Cucumber	Apr 1 – Apr 8	Apr 29 – May 13	Jun 18
Summer squash and zucchini	Apr 1 – Apr 8	Apr 29 – May 13	Jun 13
Winter squash	Apr 1 – Apr 8	Apr 29 – May 13	Jul 18
Sweet corn	—	Apr 18 – May 9	Jun 17
Onion (from sets)	—	Feb 14 – Mar 7	May 15
Garlic	—	Oct 18 – Nov 15 (fall)	following summer
Spinach	—	Jan 31 – Feb 28	Mar 10
Basil	Mar 18 – Apr 1	Apr 29 – May 13	Jun 25

How the growing season has shifted here, year by year, from the station's own records.

Each year's last spring frostLong-term trend

See the data as a table

Each year's frost-free daysLong-term trend

See the data as a table

Each year's average temperature, April to SeptemberLong-term trend

See the data as a table

What this means for you: This station's record is too short to show a reliable trend yet.

Source: daily records from Renton Muni Ap (NOAA GHCN-Daily). Years with too many missing days are left out.