Rainline Garden

When to plant rosemary in Ellensburg, WA

Plant young rosemary plants in Ellensburg Apr 15 – Jun 3.

Moderate Plant young plants

Why these dates

Ellensburg's typical last spring frost is April 28. As a cool-season crop that handles light frost, this crop doesn't need to wait for that date. In the Inland Northwest, though, the soil usually isn't ready to work until about April 15.

Inland Northwest. Higher, colder interior valleys. Cold springs and an earlier fall mean a shorter season; quick-maturing varieties pay off.

Difficulty
Moderate
Sun
Full sun
Spacing
24 to 36 inches apart
Planting depth
Plant at the depth it grew in the nursery pot
Frost
Handles light frost; wet winter soil is the bigger risk
First harvest
Pick sprigs a few weeks after planting, once new growth appears

Step by step

  1. Pick a sunny spot with soil that drains well, and mix in an inch or two of compost.
  2. Plant young rosemary plants Apr 15 – Jun 3, 24 to 36 inches apart. Plant at the depth it grew in the nursery pot.
  3. Water until established, then only in dry spells. In cold eastern areas, grow it in a pot and move it to a cool, bright spot for winter.
  4. Harvest: Snip sprig tips as needed. Don't cut back into bare wood; it won't regrow.

Varieties that do well here

  • Arp (selected for cold hardiness)
  • Hill Hardy
  • Tuscan Blue

Watch out for

Wet winter soil kills more rosemary than cold does. Plant in fast-draining soil or a raised bed.

Needs sharp drainage. It survives many west-side winters in a well-drained, sheltered spot; in colder eastern areas, grow it in a pot and bring it in for winter.

Common questions

When is the last frost in Ellensburg, WA?

Typically April 28. In 9 years out of 10, frost is over by May 12. These are 1991–2020 NOAA climate normals for Ellensburg Bowers Field.

Is it too late to plant rosemary in Ellensburg?

The spring planting window runs through June 3. Later plantings tend to struggle in summer heat.

How long until I can pick rosemary?

Pick sprigs a few weeks after planting, once new growth appears. Snip sprig tips as needed. Don't cut back into bare wood; it won't regrow.

Also plant in Ellensburg around the same time

Planting dates for rosemary in nearby areas

Full planting calendar for Ellensburg · Rosemary in every city