When to plant leeks in Coos Bay and North Bend, OR

Start leeks from seed indoors Jan 21 – Feb 4, then plant the young plants in the garden in Coos Bay and North Bend Apr 1 – May 13.

Easy Plant young plants (starts)

Why these dates

Coos Bay and North Bend's typical last spring frost is February 21. On the coast, the soil is usually ready for leeks around April 1.

Coast. Mild winters but cool, foggy summers. Frost is rarely the problem; warmth is. Pick early, cool-tolerant varieties of tomatoes and squash.

Difficulty: Easy
Sun: Full sun
Spacing: 6 inches apart
Planting depth: Set seedlings in a hole about 6 inches deep so the stems grow long and white
Frost: Handles light frost
First harvest: About 120 days after planting

Start seeds indoors Jan 21 – Feb 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.
Harden off the young plants: about a week before planting, set them outside for a few hours a day, a little longer each day.
Plant them in the garden Apr 1 – May 13, 6 inches apart. Set seedlings in a hole about 6 inches deep so the stems grow long and white.
Water deeply once or twice a week rather than a little every day, and mulch once the soil is warm.
Harvest: Dig whenever stems are an inch or more across. West of the Cascades you can leave them in the ground and harvest all winter.

Weeds crowd young leeks. Mulch and weed regularly while the plants are small.

Slow but nearly foolproof. West of the Cascades they stand in the garden all winter, ready to dig as you need them.

When is the last frost in Coos Bay and North Bend, OR?

Typically February 21. In 9 years out of 10, frost is over by March 25. These are 1991–2020 NOAA climate normals for North Bend Regional Airport.

Is it too late to plant leeks in Coos Bay and North Bend?

The spring planting window runs through May 13. Later plantings tend to struggle in summer heat.

When should I start leeks from seed indoors in Coos Bay and North Bend?

January 21 to February 4, which is 10 to 8 weeks before the April 1 planting date. Or buy young plants at a garden center instead.