Rainline Garden

When to plant kohlrabi in Spokane, WA

Plant kohlrabi in the garden in Spokane Apr 15 – May 27, either as seeds or as young plants started indoors Mar 4–18. For a fall harvest, plant again Aug 10–24.

Easy Plant seeds or young plants

Why these dates

Spokane's typical last spring frost is April 26. 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
Easy
Sun
Full sun
Spacing
Thin to 6 inches apart
Planting depth
¼ to ½ inch deep
Frost
Handles light frost
First harvest
About 55 days after planting

Step by step

  1. Start seeds indoors Mar 4–18 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, Thin to 6 inches apart. If you plant seeds instead, sow them ¼ to ½ inch deep.
  4. Water deeply once or twice a week rather than a little every day, and mulch once the soil is warm.
  5. Plant again Aug 10–24 for a fall harvest.
  6. Harvest: Cut bulbs at 2 to 3 inches across. Peel off the tough skin and eat raw or cooked.

Varieties that do well here

  • Kolibri (purple)
  • Winner
  • Kossak (large, stores well)

Watch out for

Cabbage worms chew the leaves. Insect netting keeps the white moths from laying eggs.

Pick when the bulb is about tennis-ball size; bigger ones turn woody.

Common questions

When is the last frost in Spokane, WA?

Typically April 26. In 9 years out of 10, frost is over by May 10. These are 1991–2020 NOAA climate normals for Spokane International Airport.

Is it too late to plant kohlrabi in Spokane?

The spring planting window runs through May 27. If you miss it, plant again for fall from August 10 to August 24.

When should I start kohlrabi from seed indoors in Spokane?

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

Also plant in Spokane around the same time

Planting dates for kohlrabi in nearby areas

Full planting calendar for Spokane · Kohlrabi in every city