Rainline Garden

When to plant bok choy in Olympia, WA

Plant bok choy in the garden in Olympia Mar 18 – Apr 22, either as seeds or as young plants started indoors Feb 11–25. For a fall harvest, plant again Aug 19 – Sep 2.

Easy Plant seeds or young plants

Why these dates

Olympia's typical last spring frost is April 29. As a cool-season crop that handles light frost, this crop can go in about 6 weeks before that.

West-side valleys. The Willamette Valley, Puget Sound and southern Oregon valleys. Long frost-free seasons, but soil stays cold and wet into May, so warm crops wait for warm soil, not just the last frost.

Difficulty
Easy
Sun
Full sun to part shade
Spacing
6 to 10 inches apart
Planting depth
¼ inch deep
Frost
Handles light frost
First harvest
About 45 days after planting

Step by step

  1. Start seeds indoors Feb 11–25 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 Mar 18 – Apr 22, 6 to 10 inches apart. If you plant seeds instead, sow them ¼ 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 19 – Sep 2 for a fall harvest.
  6. Harvest: Cut baby bok choy at about 6 inches tall, or whole heads at full size. Harvest before a flower stalk appears.

Varieties that do well here

  • Joi Choi
  • Toy Choy (baby size)
  • Mei Qing Choi

Watch out for

Flea beetles and slugs chew the leaves. Row cover and iron phosphate slug bait handle both.

Bolts as days lengthen, so get spring sowings in early. Fall crops are the easiest.

Common questions

When is the last frost in Olympia, WA?

Typically April 29. In 9 years out of 10, frost is over by May 15. These are 1991–2020 NOAA climate normals for Olympia Airport.

Is it too late to plant bok choy in Olympia?

The spring planting window runs through April 22. If you miss it, plant again for fall from August 19 to September 2.

When should I start bok choy from seed indoors in Olympia?

February 11 to February 25, which is 5 to 3 weeks before the March 18 planting date. Or buy young plants at a garden center instead.

Also plant in Olympia around the same time

Planting dates for bok choy in nearby areas

Full planting calendar for Olympia · Bok choy in every city