Rainline Garden

When to plant radishes in Gresham, OR

Plant radishes from seed, directly in the garden in Gresham, Mar 1 – Apr 26. For a fall harvest, plant again Sep 3–17.

Easy Plant seeds in the ground

Why these dates

Gresham's typical last spring frost is March 16. As a cool-season crop that handles light frost, this crop doesn't need to wait for that date. In the west-side valleys, though, the soil usually isn't ready to work until about March 1.

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; tolerates light shade
Spacing
1 inch apart (thin to 2 inches)
Planting depth
½ inch deep
Frost
Handles light frost
First harvest
About 28 days after planting

Step by step

  1. Prepare the bed: loosen the soil and mix in an inch or two of compost.
  2. Plant seeds Mar 1 – Apr 26, ½ inch deep, 1 inch apart (thin to 2 inches).
  3. Keep the soil evenly moist until sprouts appear, which can take one to three weeks in cool soil.
  4. Plant again Sep 3–17 for a fall harvest.
  5. Harvest: Most are ready in about four weeks. Pull them while they're small; they turn woody if left too long.

Varieties that do well here

  • Cherry Belle
  • French Breakfast
  • Easter Egg

Watch out for

Cabbage root maggots tunnel into roots in cool, wet springs. Row cover laid on at sowing keeps the flies off.

Sow a short row every two weeks for a steady supply.

Common questions

When is the last frost in Gresham, OR?

Typically March 16. In 9 years out of 10, frost is over by April 12. These are 1991–2020 NOAA climate normals for Portland-Troutdale Airport.

Is it too late to plant radishes in Gresham?

The spring planting window runs through April 26. If you miss it, plant again for fall from September 3 to September 17.

How long until I can harvest radishes?

About 28 days after planting. Most are ready in about four weeks. Pull them while they're small; they turn woody if left too long.

Also plant in Gresham around the same time

Planting dates for radishes in nearby areas

Full planting calendar for Gresham · Radishes in every city