Rainline Garden

When to plant Brussels sprouts in Omak and Okanogan, WA

Start Brussels sprouts from seed indoors Feb 18 – Mar 4, then plant the young plants in the garden in Omak and Okanogan Apr 15 – May 27.

Moderate Plant young plants (starts)

Why these dates

Omak and Okanogan's typical last spring frost is April 30. 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 inches apart
Planting depth
Plant starts at the depth they grew in the pot
Frost
Handles light frost
First harvest
About 100 days after planting

Step by step

  1. Start seeds indoors Feb 18 – Mar 4 in trays or small pots under a grow light or in your sunniest window. Or skip this step and buy young plants (starts) at a garden center.
  2. Harden off the young plants: about a week before planting, set them outside for a few hours a day, a little longer each day.
  3. Plant them in the garden Apr 15 – May 27, 24 inches apart. Plant starts at the depth they grew in the pot.
  4. Water deeply once or twice a week rather than a little every day, and mulch once the soil is warm.
  5. Harvest: Pick sprouts from the bottom of the stalk up once they're firm and about an inch across. Frost improves the flavor.

Varieties that do well here

  • Long Island Improved
  • Diablo
  • Churchill

Watch out for

Aphids cluster on the sprouts in late summer. Knock them off with a strong spray of water every few days.

A long-season crop picked in fall and winter, when frost sweetens the sprouts. West of the Cascades, plants keep producing well into winter.

Common questions

When is the last frost in Omak and Okanogan, WA?

Typically April 30. In 9 years out of 10, frost is over by May 15. These are 1991–2020 NOAA climate normals for Omak Airport.

Is it too late to plant Brussels sprouts in Omak and Okanogan?

The spring planting window runs through May 27. Later plantings tend to struggle in summer heat.

When should I start Brussels sprouts from seed indoors in Omak and Okanogan?

February 18 to March 4, which is 8 to 6 weeks before the April 15 planting date. Or buy young plants at a garden center instead.

Also plant in Omak and Okanogan around the same time

Planting dates for Brussels sprouts in nearby areas

Full planting calendar for Omak and Okanogan · Brussels sprouts in every city