When to Plant Carrots

Updated August 2026 · Garden Advice Guide

Direct sow carrot seed 2 to 3 weeks before your last spring frost, then sow again in mid to late summer for a fall crop. Carrots must be direct sown, never transplanted, because disturbing the taproot at any stage produces a forked, stunted, or twisted root instead of a straight one. Young carrot seedlings handle frost down to about 28°F, which is why they can go in well before tomatoes.

Not sure of your dates? Our free frost date lookup turns your zip code into a spring and fall sowing window in a couple of seconds.

The Fall Crop Is the Better Crop, and Late August Is the Window

If you only grow carrots once a year, grow them in fall. They're measurably sweeter, and there's real plant physiology behind it rather than folklore.

When soil and air temperatures drop toward freezing, a carrot converts stored starch in its root into sugars. Sugars lower the freezing point of the cell sap, so the plant is essentially making its own antifreeze to protect its tissue through cold nights. You get the benefit: a carrot pulled after two or three light frosts tastes noticeably sweeter than the same variety pulled in July.

The rest of the fall advantages stack up fast:

• Cooling soil, not heating soil. Spring sowings often germinate into a bed that's getting hotter and drier by the day. Fall sowings germinate in warm soil and then finish in cool weather, which is exactly backwards from what carrots hate.
• Fewer pests. Carrot rust fly pressure and weed competition both drop off in September and October.
• No bolting risk. A carrot that gets chilled hard as a young seedling in spring can bolt to seed. Fall crops never face that.
• They keep in the ground. A fall carrot bed is a root cellar you don't have to build. More on that below.

Timing the fall sowing: count back from your first fall frost by the variety's days to maturity, then add 2 to 3 weeks, because growth slows sharply as day length shortens in October. For a 70-day carrot in a zone 6 garden with an October 15 first frost, that's October 15 minus 70 days (August 6) minus 3 weeks (mid July). In practice, late July through mid August is the fall window for most of zones 5 through 7, and it runs into September for zones 8 and 9.

Late August is still fine in zones 7 through 9. In zones 5 and 6, sow immediately and choose a fast variety in the 55 to 65 day range. For everything else going in the ground right now, see our guide to what to plant in September.

Why Carrots Must Be Direct Sown

A carrot is its taproot. Unlike a tomato or a lettuce, where the root system is just plumbing, the carrot's root is the harvest, and it forms early. Within about 10 days of germination the seedling has already sent down a slim primary root that will thicken into the carrot you eventually pull.

Bend it, break it, or crowd it at that stage and it responds by forking, kinking, or splitting into two or three stubby roots. Transplanting almost guarantees it, because lifting a seedling from a cell inevitably curls the tip.

There is no workaround worth the trouble. Soil blocks and paper pots reduce the damage but don't remove it, and the seedlings gain so little from a 3-week head start that it isn't worth the failure rate. Sow where they'll grow.

This is the opposite of most spring crops, and it's a genuinely useful thing to know when you're planning a bed. Carrots, parsnips, beets, radishes, and turnips go in the ground as seed. Tomatoes, peppers, and brassicas come in as transplants.

Soil Temperature: 45 to 85°F Germinates, 70 to 75°F Is the Sweet Spot

Carrot seed is more forgiving on temperature than most people expect and much less forgiving on moisture.

Oregon State University Extension's soil temperature data for vegetable seed germination lists carrots as germinating across roughly 45 to 85°F, with the fastest emergence in the upper part of that range. In practice, 70 to 75°F is the number to aim for: fast enough to beat the seed rotting, cool enough that the surface doesn't dry out every two hours.

An inexpensive soil thermometer pushed 1 inch deep, read mid-morning for three days running, tells you more than any calendar.

The Germination Problem That Defeats Most Gardeners

More carrot crops are lost in the first three weeks than at any other point. Three things are working against you at once.

1. The seed is tiny and shallow. Carrot seed gets sown only 1/4 inch deep, which puts it in the exact layer of soil that dries out first. There is no moisture reserve down there.

2. It takes 14 to 21 days. That's a long time to keep a surface layer continuously damp. Radish is up in 4 days. Carrot makes you wait, and one hot dry afternoon in the middle of that stretch kills the whole sowing.

3. Soil crusting. This is the invisible killer. Rain or overhead watering on bare soil, followed by sun, forms a hard crust on the surface. The carrot seedling emerges with a thread-thin shoot that simply cannot push through it. The seed germinated. It just died an inch from daylight.

Here's what actually solves all three:

• Cover the seed with vermiculite, not soil. Sow into the furrow, then fill it with a 1/4 inch layer of fine vermiculite or sifted compost instead of garden soil. Neither one crusts, both hold moisture, and this single change fixes more carrot failures than anything else on the list.
• Lay a board over the row. A plank, a piece of cardboard, or burlap laid directly on the sown row holds moisture almost perfectly. Check underneath daily starting on day 6 and lift it the moment you see the first white shoots. Leave it a day too long and you'll get pale, stretched seedlings.
• Water gently, twice a day. Use a fine rose on a watering can or a mister, not a hose jet, which blasts seed out of the furrow and packs the surface. Morning and evening in warm weather.
• Sow radish as a marker crop. Mix a few radish seeds into the carrot row. Radish is up in 4 days, so it marks the row while you're still weeding blind, and its faster growth breaks any crust for the carrots following behind. Pull the radishes at 25 to 30 days, before they crowd anything.
• Never let the bed dry out. Not once. This is the whole game.

Soil: Loose, Stone-Free, and 12 Inches Deep

Carrot shape is decided entirely by soil, and this is where honest advice matters more than encouragement.

The target is loose, well-drained soil worked to 12 inches deep with no stones, no clods, and no compacted layer. A carrot root that meets a pebble forks around it. A root that hits a compacted pan at 6 inches stops there and thickens into a stump.

If you garden on heavy clay or rocky ground, you will not grow a 10-inch Imperator carrot. No amount of amendment fixes that in one season. Rather than fighting it, do one of these:

• Grow short varieties. 'Paris Market' is a golf-ball-shaped carrot that needs about 4 inches of soil. 'Danvers Half Long' is a stubby 6 to 7 inch cone that pushes through heavier ground better than anything else. 'Chantenay' types are broad-shouldered and short for the same reason.
• Build a raised bed. Ten to twelve inches of screened topsoil and compost over your native ground grows perfect carrots regardless of what's underneath.
• Double dig one bed. Loosen the lower spit with a fork without turning it over. Worth doing once, not annually.

Do not add fresh manure, and go easy on nitrogen. This is the second big carrot mistake. Fresh manure and high-nitrogen fertilizer both cause forking and a dense fuzz of hairy feeder roots along the carrot, and they push leafy top growth at the expense of the root. Carrots want a bed that was manured the previous season, plus modest phosphorus and potassium. If you're feeding at all, a low-nitrogen fertilizer around 5-10-10 is the right shape.

Aim for a soil pH of 6.0 to 6.8. Our guide to how to test garden soil covers reading your own pH and texture before you sow, which is the single most useful hour you can spend on a carrot bed.

When to Plant Carrots by Zone

Spring sowings go in 2 to 3 weeks before the last frost. Sow again every 2 to 3 weeks until temperatures climb past the mid 80s, then stop and wait for the fall window.

Two adjustments worth knowing. In zones 8 through 10, a midsummer sowing is a waste of seed, because carrots grown through sustained heat above 85°F turn bitter and woody. And in zones 3 through 6, a very early spring sowing into cold soil can cause young plants to bolt later, so waiting for 50°F soil beats rushing.

For how carrots slot in alongside the rest of the season, our planting calendar by zone lays out the full sequence, and when to plant potatoes follows a similar early-spring, cool-soil logic.

Thinning: The Step Everyone Skips

This is why most home-grown carrots are pencil-thin. Carrot seed is so small that everybody sows too thickly, and then nobody can bring themselves to pull healthy seedlings out.

Pull them anyway. A carrot needs 2 to 3 inches of clear space or it simply cannot expand sideways. Crowded carrots stay skinny no matter how long you leave them, and they twist around each other.

Thin twice:

• First thinning, at 2 inches tall (roughly 3 weeks after emergence): thin to 1 inch apart. Snip at the soil line with small scissors instead of pulling, because pulling drags the neighbors' roots.
• Second thinning, at 4 to 5 inches tall (roughly 6 weeks): thin to a final 2 to 3 inches apart. These pulls are big enough to eat as baby carrots, so it feels less wasteful.

Water right after thinning, and firm the soil back around the remaining plants. Bruised carrot foliage releases a smell that attracts carrot rust fly, so thin in the evening and remove the trimmings from the bed rather than leaving them lying there.

Hill the shoulders. As carrots size up, the tops push out of the soil and turn green and bitter where light hits them. Draw an inch of soil or mulch over the row every few weeks.

Carrot Varieties: Match the Type to Your Soil

For a first fall crop in average garden soil, 'Danvers Half Long' or a Nantes type like 'Bolero' are the safest picks. 'Bolero' in particular holds well in the ground through cold weather. For a container or a bed over rubble, grow 'Parisienne' and stop fighting.

How Long Do Carrots Take to Grow, and When to Harvest Them

Most carrots run 60 to 80 days from sowing to harvest, with round types as fast as 50 days and big storage types up to 85. Add 2 to 3 weeks to any packet number for a fall crop, because shortening days slow everything down.

How to tell they're ready without pulling one:

• Check the shoulder. Brush the soil away from the top of the root with your finger. If the crown is 3/4 inch to 1 inch across, it's a usable carrot. Push the soil back if it isn't.
• Finger thickness is the practical minimum. Anything from there up is worth pulling. Bigger isn't always better, since oversized carrots can get woody cores.
• Don't judge by the tops. Lush foliage often means too much nitrogen and a small root underneath.

Harvest technique: water the bed first, then loosen underneath with a fork before pulling, particularly in heavy soil. Pulling a dry, tight carrot straight up snaps it and leaves the bottom half in the ground.

Let the frost hit them. Wait until after two or three light frosts before harvesting a fall crop. That's the starch-to-sugar conversion doing its work, and the difference in taste is obvious.

Storing carrots in the ground. In zones 5 and warmer, a fall carrot bed under 12 to 18 inches of straw, shredded leaves, or hay stays diggable well into winter. Cover the bed after the first hard frost but before the ground freezes, and pull what you need. This works better than any refrigerator and needs no equipment. In zones 3 and 4 the ground freezes too solidly, so lift the crop and store it.

Storing carrots in the fridge. Cut the tops off within an hour of harvest, leaving about 1/2 inch of stem. Leafy tops keep pulling moisture out of the root and it goes limp within days. Don't wash them for storage, just brush off loose soil. Put them in a perforated bag or a container of barely damp sand in the crisper, and they'll hold for 2 to 4 months.

Worked Example: A Zone 6 Fall Crop, Sown August 4

Here's a full fall carrot crop with the arithmetic shown, for a zone 6 garden with a first fall frost of October 15.

The setup. Variety is 'Danvers Half Long', 70 days to maturity. Soil is a raised bed worked to 11 inches, no fresh manure, a light dressing of 5-10-10 raked in a week ahead.

The date math. October 15 minus 70 days is August 6. Add 3 weeks for slowing fall growth and the ideal sowing date is mid July. This gardener is running late at August 4, which is fine, because a fall carrot doesn't need to finish before frost. It only needs to be big enough to be worth pulling, and it keeps sizing up slowly through October.

August 4, sowing. Soil temperature reads 78°F at 1 inch. Two rows, 12 inches apart, seed sown thinly at 1/4 inch deep. The furrows are backfilled with vermiculite instead of soil. A dozen radish seeds are scattered along each row. Boards laid over both rows.

August 5 to 12. Watered gently morning and evening. Boards lifted daily to check. Radishes are up on August 8.

August 13. First carrot shoots visible under the boards, day 9. Boards come off that morning. Watering drops to once a day.

September 3. Seedlings are 2 inches tall. First thinning to 1 inch apart, snipped with scissors in the evening. Radishes pulled and eaten.

September 24. Plants are 5 inches tall. Second thinning to 3 inches apart. The pulls are finger-thin baby carrots, and they're already good. Soil drawn up over the shoulders.

October 13. First light frost, 30°F. Nothing to do. Tops are undamaged.

October 21 and 28. Two more frosts, one at 27°F. Now the sugar conversion has happened.

November 2, first real harvest. August 4 plus 70 days was October 13, but the extra three weeks of cool weather have made these both bigger and sweeter. Shoulders are running 1 to 1.25 inches. Bed loosened with a fork, carrots pulled, tops cut off in the garden.

November 8. The remaining half of the bed gets covered with 14 inches of shredded leaves held down with chicken wire. The gardener digs carrots from under it through late January.

Total result: one sowing in early August, about 12 weeks of near-zero maintenance, and fresh carrots from November into midwinter.

FAQ

When do you plant carrots in spring?

Two to three weeks before your last spring frost, once soil has reached at least 45°F. Carrot seedlings tolerate frost down to roughly 28°F, so they go in long before warm-season crops. Sow again every 2 to 3 weeks until daytime highs reach the mid 80s.

Can you transplant carrot seedlings?

No, not with good results. The taproot forms within about 10 days of germination and any disturbance to its tip causes forking, kinking, or splitting. Carrots, parsnips, beets, and radishes all belong in the direct-sown group.

How deep do you plant carrot seeds?

A quarter inch, and no deeper. Because that layer dries so fast, cover the furrow with vermiculite or sifted compost rather than garden soil, and keep it damp for the full 14 to 21 days it takes to emerge.

Why are my carrots forked and stunted?

Three usual causes: stones or clods in the soil, fresh manure or too much nitrogen, or crowding from skipped thinning. Compacted subsoil is a fourth. Short varieties like 'Paris Market' or 'Chantenay' sidestep the soil problem entirely.

Why didn't my carrot seeds come up?

Almost always drying out or soil crusting. Carrot seed takes 14 to 21 days and sits only 1/4 inch deep, so one hot dry afternoon in the middle of that window kills the sowing. Cover the row with a board or burlap, water gently twice a day, and use vermiculite over the furrow.

How long do carrots take to grow?

Sixty to 80 days for most varieties, 50 days for round types like 'Parisienne', and up to 85 for large storage carrots. Add 2 to 3 weeks for fall crops, because growth slows as days shorten.

Do carrots really get sweeter after frost?

Yes. Cold triggers the plant to convert stored starch in the root into sugars, which act as antifreeze in the cell sap. Two or three light frosts make a clear difference in taste, and it's the main reason to grow a fall crop.

Can you grow carrots in containers?

Yes, with the right variety and depth. Use a pot at least 12 inches deep for Nantes or Danvers types, or 6 inches for round 'Parisienne'. Fill with a loose, stone-free potting mix, thin to 2 inches apart, and expect to water daily in warm weather since containers dry out fast.

Updated August 2026

A note on numbers. This page gives you timing, quantities and spacing, not dollar figures. Seed, plant and material pricing varies by region, by supplier and by season, and we do not set any of it. Work out what you need here, then price the list at two or three local suppliers.