When to Plant Carrots in Oregon
Published: April 21, 2026
Oregon gardeners in Zone 4b have a 21-week frost-free window for carrot (May 7 to October 1). Cool-season crops like carrot do well here because the short, cool summers match the plant's temperature preferences naturally. This guide gives exact dates for Oregon based on your local frost calendar.
Carrot Planting Dates for Oregon
| Start seeds indoors | Year-round |
| Last frost (average) | May 7 |
| Direct sow outdoors | April 9–19 |
| Expect first harvest | June 18 – June 28 |
| Fall crop start | July 23–August 2 |
| Fall harvest | October 1 |
| First fall frost (average) | October 1 |
Dates above assume Zone 4b, the most common zone in Oregon. Gardeners in cooler Portland (Zone 4b) plant 1–2 weeks later; warmer Medford (Zone 5b) can plant 1–2 weeks earlier.
Growing Carrots in Oregon's Climate
Oregon's cold Zone 4b climate is close to ideal for carrot. The cool springs and moderate summers match the plant's natural temperature preferences, producing crisp, sweet, slow-bolting harvests that hot-climate gardeners cannot grow.
The fall carrot crop in Oregon is often better than the spring crop. Plants mature as temperatures cool in September and October, concentrating sugars and tightening heads or roots. Light frost can improve flavor; hard frost signals harvest time.
Common carrot pests to watch for in Oregon include Carrot Fly and Wireworm. The first line of defense is companion planting: Tomato and Onion planted nearby discourage several of these pests by confusing host-plant identification or repelling adults before they can lay eggs. Weekly garden walks in the early morning catch problems when they're still manageable.
Carrot Garden Calendar for Oregon
| Month | Task | Notes |
|---|---|---|
| January | — | Dormant season |
| February | — | Dormant season |
| March | — | Dormant season |
| April | Direct sow seeds | Sow seeds 1/4–1/2 inch deep, 3 inches apart |
| May ← | Watch for bolting | Harvest promptly; spring heat arrives quickly |
| June | First harvest window opens | Carrot begins producing 70–80 days after transplant |
| July | Fall crop planting | Transplant or direct sow for fall harvest before frost |
| August | — | Dormant season |
| September | — | Dormant season |
| October | First frost approaches | Harvest remaining carrot; cover plants on frost nights |
| November | — | Dormant season |
| December | — | Dormant season |
Carrot Growing Tips for Oregon Gardeners
- •Direct sow ONLY — transplanting carrots causes forked, misshapen roots every time.
- •Soil must be loose and rock-free to at least 12 inches deep; raised beds are ideal.
- •Oregon's short growing season means start seeds indoors under grow lights — don't rely on windowsill light which produces leggy, weak seedlings that struggle outdoors.
- •Cover young transplants with floating row covers for the first 2–3 weeks outside. The 3–5°F of protection reduces frost damage risk and accelerates early growth.
- •Thin to 3-inch spacing aggressively — crowded carrots fork and grow stunted.
Companion Planting for Carrots in Oregon
In Oregon's cold climate, planting carrot with Tomato and Onion helps deter pests and improve soil. Avoid planting near Dill and Parsnip, which inhibit carrot growth through root chemistry or shared pest pressure. See the full carrot companion planting guide for the complete list.
Carrots Planting Dates by City in Oregon
Top cities in Oregon — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant carrot in Oregon?
In Oregon (Zone 4b), start carrot seeds indoors around Year-round and transplant outdoors around null — 0 weeks after the state's average last frost of May 7.
What is the last frost date in Oregon?
Oregon's average last frost date is May 7 in the state's most common Zone 4b. Frost dates vary by city — higher elevations and northern counties run 1 to 3 weeks later than the state average. See the city list below for city-level frost dates.
Can I grow carrot year-round in Oregon?
carrot is a cool-season crop in Oregon, with spring and fall windows. Summer heat bolts the plants before they can produce a harvestable crop. Succession planting every 2–3 weeks stretches the harvest window.
What carrot varieties grow best in Oregon?
For Oregon's Zone 4b, Danvers 126 and Chantenay tolerate heavy soils and store well through winter.
When do I start carrot seeds indoors in Oregon?
Carrot does not need indoor starting in Oregon — direct sow around April 9–19 once soil reaches 45°F. Indoor starting is not recommended for this crop because carrot transplants poorly.