Growing Carrots: A Complete Profile
By Growing Home Greens Team · July 16, 2026
Carrots are almost never transplanted, their taproot resents disturbance and will fork or stunt if moved once it’s started growing. Every carrot in a garden should go from seed packet directly into its final spot in the ground.
Soil that determines the shape of the root
Loose, rock-free, well-worked soil to a depth of at least the carrot variety’s mature length is the single biggest factor in straight, well-formed roots. Compacted or rocky soil produces short, forked, or twisted carrots, still edible, just less photogenic. Carrot seeds are tiny and slow to germinate (up to three weeks), so keep the soil consistently moist during that stretch; a light layer of straw or vermiculite over the row helps prevent the surface from crusting over.
Thin them, even though it feels wasteful
Thin, pale carrots usually mean the seedlings were never thinned. Carrots need spacing between roots (about the width of the mature carrot itself) to size up properly. It feels wasteful to pull healthy-looking seedlings, but crowded carrots stay small no matter how long you wait.
The densest square in the grid
Onions and carrots are a well-known pest-confusing pair. See the full companion guide for carrots. At 16 plants per square foot, carrots are the densest crop in the Garden Designer’s grid, which makes them an efficient use of bed space once the soil prep is right.
Companion planting guide for Carrot · Find your planting dates
Typically viable in USDA zones 2-10. Not sure your zone? Look it up by ZIP code.
Mature height: 0.5-1 ft
Method: Direct sow: Direct-sow outside. It doesn't transplant well, or doesn't need the extra time indoors.
When to plant carrot, by zone
Every zone carrot grows in. Pick your zone in the header and it will be highlighted here. Each zone links to its full page.
| Zone | Start indoors | Sow or plant out | Harvest |
|---|---|---|---|
| 2a & 2b | Not usually | Apr 29–May 6 | Jul 8–Jul 15 |
| 3a & 3b | Not usually | May 9–May 16 | Jul 18–Jul 25 |
| 4a & 4b | Not usually | Apr 24–May 1 | Jul 3–Jul 10 |
| 5a & 5bSpring window | Not usually | Apr 19–Apr 26 | Jun 28–Jul 5 |
| Fall window | Not usually | Jul 13–Jul 27 | Sep 21–Oct 5 |
| 6a & 6bSpring window | Not usually | Apr 4–Apr 11 | Jun 13–Jun 20 |
| Fall window | Not usually | Jul 23–Aug 6 | Oct 1–Oct 15 |
| 7a & 7bSpring window | Not usually | Mar 20–Mar 27 | May 29–Jun 5 |
| Fall window | Not usually | Aug 2–Aug 16 | Oct 11–Oct 25 |
| 8a & 8bSpring window | Not usually | Mar 4–Mar 11 | May 13–May 20 |
| Fall window | Not usually | Aug 18–Sep 1 | Oct 27–Nov 10 |
| 9a & 9bSpring window | Not usually | Jan 25–Feb 1 | Apr 5–Apr 12 |
| Fall window | Not usually | Sep 12–Sep 26 | Nov 21–Dec 5 |
| 10a & 10bFall window | Not usually | Sep–Mar | ~70 days after direct-sowing |
Harvest dates are about 70 days after the sow or plant-out date.
Zone 2 sows before zone 3 here, which looks wrong and is not. USDA zones rank winter cold, not season length, and zone 2 is mostly interior Alaska, where hard winters come with warm summers. More on what a zone measures.
See exact start-indoors, direct-sow, and harvest dates for your zone →
How many Carrot plants fit per square foot?
Spacing: 16 per square foot (square-foot-gardening spacing). Mature height: 0.5-1 ft.
Soil & water: pH 5.5-6. Needs well-drained soil. Amend with lime if soil pH falls below 5.5.
Good companions for carrot
- Onion: A real, peer-reviewed field study (Uvah & Coaker 1984) found intercropping onions with carrots reduced carrot rust fly damage, on the theory that mixed scents mask the host plant from pests hunting by smell.
- Tomato: Carrots aerate soil around tomato roots.
Full companion guide, including what to keep away from carrot →
Varieties worth considering
- Napoli (F1): The breeder notes it grows notably sweet when maturing in cold soil and is a common choice for fall sowing/overwintering in cold-climate gardens. (source) Buy seeds: High Mowing Organic Seeds
- Bolero (F1): A Nantes storage type Johnny's rates with high resistance to Alternaria blight and powdery mildew, plus intermediate resistance to bacterial blight, cavity spot and Cercospora. The one to grow if you want carrots that hold in the ground into fall rather than pulling everything at once. (source)
- Yaya (F1): A Nelson-type early carrot with good vigor for its speed, mild flavor and early sugar development. Pairs with Napoli for an early harvest and with Bolero for storage, giving three different jobs across one carrot bed instead of one variety doing all of them adequately. (source) Buy seeds: Burpee · High Mowing Organic Seeds
- 'Purple Haze' (F1) (best for: color, novelty): Johnny's AAS-winning Imperator carrot has dark purple skin over a bright orange interior and excellent flavor at about 73 days, a striking color none of the varieties above offer (cooking fades the purple, so it's best for raw eating or a garnish where the color shows). (source)
Why each variety is listed comes from the source shown next to it. We haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement. The buy links are separate from those sources: they go to seed suppliers that sell that exact variety, and we may earn a commission on some of them.
Where to buy carrot seeds
Botanical Interests · True Leaf Market · Burpee · High Mowing Organic Seeds (each supplier's carrot seeds)
The varieties we recommend above each have their own buy links, for the suppliers that sell that exact variety.
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See it growing
Search YouTube for "growing carrot" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Carrot: Why carrots go directly in the ground, and the one soil requirement that determines whether they grow straight or stubby.
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