When to plant thyme in Sunnyside, Grandview and Prosser, WA

Plant young thyme plants in Sunnyside, Grandview and Prosser Apr 3 – May 29.

Easy Plant young plants

Why these dates

Sunnyside, Grandview and Prosser's typical last spring frost is May 1. As a cool-season crop that handles light frost, this crop can go in about 4 weeks before that.

Columbia Basin and low eastern valleys. Hot, dry summers and quick spring warm-up. Warm crops go in earlier than west of the Cascades, and irrigation matters more than rain.

Difficulty: Easy
Sun: Full sun
Spacing: 12 inches apart
Planting depth: Plant at the depth it grew in the nursery pot
Frost: Handles light frost
First harvest: Pick lightly the first year, freely after that

Step by step

Pick a sunny spot with soil that drains well, and mix in an inch or two of compost.
Plant young thyme plants Apr 3 – May 29, 12 inches apart. Plant at the depth it grew in the nursery pot.
Water only until established; thyme prefers dry soil. Replace plants every few years when they get woody.
Harvest: Snip sprigs before the plant flowers for the best flavor. Trim lightly after flowering to keep it compact.

Varieties that do well here

English thyme
French thyme
Lemon thyme

Watch out for

Root rot in heavy, wet soil. Give it gravelly soil or a raised spot.

Drought-tolerant once established and hates wet feet. Raised beds and rocky edges suit it.

Common questions

When is the last frost in Sunnyside, Grandview and Prosser, WA?

Typically May 1. In 9 years out of 10, frost is over by May 18. These are 1991–2020 NOAA climate normals for Sunnyside.

Is it too late to plant thyme in Sunnyside, Grandview and Prosser?

The spring planting window runs through May 29. Later plantings tend to struggle in summer heat.

How long until I can pick thyme?

Pick lightly the first year, freely after that. Snip sprigs before the plant flowers for the best flavor. Trim lightly after flowering to keep it compact.

Also plant in Sunnyside, Grandview and Prosser around the same time

Planting dates for thyme in nearby areas

Yakima, WA Apr 10 – Jun 5
Tri-Cities (Pasco, Kennewick, Richland), WA Apr 1 – May 27
Walla Walla, WA Apr 1 – May 27
Moses Lake, WA Apr 1 – May 27
Ellensburg, WA Apr 15 – Jun 10
Ephrata and Quincy, WA Apr 1 – May 27

Full planting calendar for Sunnyside, Grandview and Prosser · Thyme in every city