Oregon · zones 6a–9a
When to plant carrots in Oregon.
Sow between Mar 8 to Apr 10 in a typical year, keyed to Oregon's median last frost around Apr 15. A second, fall sowing fits Jul 30 to Aug 25. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Carrots dates for a typical Oregon season.
Direct sow
Mar 8 to Apr 10
Keyed to the ~Apr 15 last frost. Sow 0.25" deep, 2" apart.
Fall round
Jul 30 to Aug 25
Counted back from the ~Oct 25 first frost.
Harvest
~68 days later
~0.2 lb per plant over ~2 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
A carrot here takes 68 days and gets as many as six turns in the ground, and the pest that decides whether the roots come up clean tracks the state's damp side far more than its dry one.
Six rounds, timed by the calendar instead of the thermometer
A quarter inch of soil is all that covers a carrot seed here, sown direct into the row and thinned to 2 inches apart once the true leaves show. That thin a covering dries out fast in full sun, and a carrot seed that dries out even once during germination usually stalls rather than resuming when it's watered again. The overcast, misty spring that has warm-season gardeners waiting impatiently to set out transplants is doing a carrot a favor here, keeping that top layer damp without anyone standing over it with a hose.
The state's frost-free stretch runs 193 days, and a 68-day carrot fits into it as many as six separate times. Spread evenly, that works out to a fresh row roughly once a month, a slower rhythm than the faster salad greens in this same garden get, since a root this size spends more than twice as long underground as a quick leaf crop does. A Nantes type that turns sweet on a late sowing, Napoli is one example, is worth favoring for the last round or two.
The fly that ruins a root nobody sees coming
Carrot rust fly is the pest that decides more harvests here than any other. The adult lays eggs at the soil line right next to the leaf stems, and the larvae that hatch tunnel into the root from the shoulder down, leaving rust brown, corky trails that usually go unnoticed until the carrot is out of the ground and sliced lengthwise near the top. Because the fly is a weak, low flier that moves at ground level rather than riding the wind, a physical barrier beats a spray: fine mesh or row cover laid over the bed from the day it's sown, sealed at the edges so nothing can crawl in underneath, keeps the female from reaching the soil to lay.
This fly tracks cool, damp weather, which puts more pressure on gardens in the misty valley and coastal half of the state than on the hot, dry ground east of the mountains, where a short season and thin soil are the bigger fight. Even on the wet side, a root sown for a fall harvest often comes up cleaner than a spring one, since the fly's heaviest activity lines up with the coolest, wettest stretch of the year rather than late summer, when the soil has had more of a chance to dry between rounds.
A caterpillar worth sparing, and a leaf disease that decides how the roots get pulled
Parsleyworm looks alarming the first time it turns up, a fat caterpillar banded in green, black, and yellow, feeding openly on the ferny top growth. It's the larva of the black swallowtail butterfly, and most gardeners who recognize it move it to a spare stand of dill or parsley rather than squash it, since carrot foliage usually absorbs some feeding without the root underneath losing much size. Aphids cluster in that same ferny growth, tucked in close enough to the stem that a light infestation is easy to miss until the leaves start looking dull.
Alternaria leaf blight is the one that changes how harvest goes. It starts as small, dark, irregular lesions on the oldest outer leaves and works inward, and a bad case can leave too little sound leaf to grip, forcing a fork under the row instead of a clean pull by the tops. At roughly a fifth of a pound per root, no single carrot looks like much, but six rounds through a 2-inch-spaced row add up to a fairly reliable trickle across most of the year instead of one glut and a long gap.
In Oregon: watch for
The pests that find carrots here.
A middle-length season, about 193 frost-free days, means carrot overlaps carrot rust fly for a stretch each summer. Check plants every week or two and treat early.
Rusty tunnels in the roots and stunted tops.
Organic fix: Cover the row; rotate away from last year's carrots.
Big green-and-black striped caterpillars on the foliage.
Organic fix: Handpick (or leave for swallowtails); Bt if heavy.
Brown spots ringed in yellow on the oldest leaves first, darkening until the tops look scorched.
Organic fix: Water at the base rather than overhead, turn under old carrot tops, and leave 2 years between carrot crops.
Your season math: Oregon gives carrots about 193 frost-free days, and it needs roughly 68 days to a first harvest. That fits about 6 re-sown rounds across the season, so you can keep it coming instead of picking once.
Planting carrots in Oregon: questions
When should I plant carrots in Oregon?+
In a typical Oregon year, sow carrots between Mar 8 to Apr 10, keyed to the state's median last frost around Apr 15. There's also a fall window: Jul 30 to Aug 25. Your exact dates shift with your ZIP code and microclimate.
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 carrots 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.