Oregon · zones 6a–9a
When to plant kale in Oregon.
Sow or transplant between Mar 8 to Apr 5 in a typical year, keyed to Oregon's median last frost around Apr 15. A second, fall sowing fits Jul 25 to Sep 9. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Kale dates for a typical Oregon season.
1 · Start indoors
Jan 25 to Feb 22
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Mar 8 to Apr 5
Keyed to the ~Apr 15 last frost. Sow 0.25" deep, 16" apart.
Fall round
Jul 25 to Sep 9
Counted back from the ~Oct 25 first frost.
Harvest
~45 days later
~2 lb per plant over ~16 weeks.
Oregon spans more than one climate: Zone 8 is the most common zone, but the state runs 6a to 9a. That's why the planner works from your ZIP code's frost dates, not your zone: mountain and coastal gardens in the same state can be three weeks apart.
Oregon growing notes
Kale here needs only one planting a year, and west of the Cascades that single transplant can keep producing leaves clear through winter, a trick the cold side of the state can't repeat.
One planting built to outlast the season it started in
A transplant, not direct seed, is how kale starts here, begun a quarter inch deep indoors and moved out once it carries a real set of leaves, then spaced 16 inches apart in the row, room for a plant that keeps producing long after crops sown the same week have finished. One planting a year is what this crop calls for: it isn't restarted, it's kept alive and cut again and again.
Forty-five days gets a transplant to a size worth cutting from, and that first harvest starts the relationship rather than ending it. Taking the lower, older leaves a few at a time and leaving the central growing point untouched keeps a plant producing new leaves for months past that mark, adding up to around 2 pounds of leaves off a single plant.
Why the mild side of the state turns this crop from annual to nearly year-round
This is the crop where the marine half of the state pulls ahead. A transplant set out for the fall window here can stand through winter in the valley and along the coast, producing leaves through the cold months instead of dying back, so a single fall planting often works as a year-round leaf supply. East of the mountains, winter cold runs hard and long enough that the same plant doesn't get that option, and the growing year there looks like the bounded stretch most vegetables get everywhere, without the mild side's long tail into winter.
A plant that winters over this way still reaches the end of its life on its own schedule. By mid-spring, the same plant sends up a central flower stalk as it shifts into its second year, and the remaining leaves turn bitter fast once that stalk appears. That's the plant finishing naturally, not a mistake in how it was grown, and it's the moment to pull it rather than wait for it to recover.
Pests that matter more on a plant that stands all year than on one harvested once
Because a kale plant here can stand in the same spot for most of a year, pests get more time to build up on it than on a crop gone from the ground in a couple of months. Cabbage root maggot hits earliest, a soil-dwelling larva that tunnels into a young transplant's roots during the same cool, damp spring that makes this climate mild; a wilting transplant that lifts free of the soil with almost no root left is the sign, and a collar of cardboard or fabric fitted around the stem at planting keeps the egg-laying fly from reaching the soil. Aphids are the long-game pest here, tucking into the crease where each leaf meets the stem; a water spray aimed into those creases, not just across the leaf surface, is what reaches them.
Cabbage worms and loopers chew ragged holes through the leaves all season, cosmetic rather than crop-ending on a plant grown for leaf rather than a single head, though a heavy population can still slow it down. Flea beetles show up hardest on young transplants in the driest stretch of late summer, peppering new leaves with small round holes before a plant destined to stand all winter has the size to shrug it off. Black rot is the one worth watching closest: yellow, wedge-shaped patches run in from the leaf edge with the veins gone black, and cutting an affected leaf's main vein crosswise shows a blackened ring once infection reaches the vascular system, and that plant should come out rather than infect its neighbors.
In Oregon: watch for
The pests that find kale here.
A middle-length season, about 193 frost-free days, means kale overlaps cabbage worms & loopers for a stretch each summer. Check plants every week or two and treat early.
Green caterpillars chewing ragged holes; green droppings.
Organic fix: Handpick, cover with netting, spray Bt.
Gray-green clusters tucked into the leaf folds.
Organic fix: Blast with water, then insecticidal soap.
Tiny holes peppering the young leaves.
Organic fix: Row cover from day one; diatomaceous earth.
Black rot
Yellow V-shaped wedges cutting in from the leaf edge, veins blackening inside.
Organic fix: Pull infected plants, water at the base, keep brassicas out of that bed 3 years.
Seedlings wilt, yellow and stall for no reason; white maggots tunnel the roots.
Organic fix: Row cover before the flies are up, when yellow rocket blooms; rotate the bed.
Your season math: Oregon gives kale about 193 frost-free days, and it needs roughly 45 days to a first harvest. It's a one-planting crop, so time that single sowing well.
Planting kale in Oregon: questions
When should I plant kale in Oregon?+
In a typical Oregon year, sow kale or set out transplants between Mar 8 to Apr 5, keyed to the state's median last frost around Apr 15. There's also a fall window: Jul 25 to Sep 9. Your exact dates shift with your ZIP code and microclimate.
When do I start kale seeds indoors in Oregon?+
Start seeds inside about 6 weeks before set-out: roughly Jan 25 to Feb 22 for a typical Oregon season.
What USDA zone is Oregon?+
Oregon spans zones 6a–9a, mostly zone 8. But frost dates, not zones, set planting time. The free planner uses your ZIP code's actual frost dates.
How many kale plants do I need?+
Depends who you're feeding. The crop page has exact counts per household size, or the free planner does the math for your family in about 60 seconds.