How to grow carrot
Family Apiaceae. Hardy to USDA hardiness zone 3a+ (U.S. Department of Agriculture). Full sun. Ready in 60-80 days.
Sun
Full sun
Spacing
2-3 in
Days to harvest
60-80 days
Hardiness
Zone 3a+
What growers actually recorded
Loading zone 7b results…
When to plant carrot
- Direct sow: ~-3 weeks after last frost.
Companion plants for carrot
Plant with: Onion, Rosemary, Lettuce, Tomato.
Avoid near: Dill.
Common pests & problems
Carrot rust fly. Row cover; avoid disturbing tops.
Feeding & fertilizer
N-P-K ratio: Low N, higher P (3-6-6)
Organic options: Compost only in bed prep · Bone meal at sowing · Skip nitrogen top-dress
When to feed: Feed the bed, not the plant. Carrots/parsnips fork or hair-root with fresh manure.
Watch for: Forked roots = too much N or fresh manure; use only well-aged compost.
N = nitrogen (leaves), P = phosphorus (roots and flowers), K = potassium (fruit and disease resistance). How to read a fertilizer label →
Grower's tip
Keep soil surface consistently moist for 14 days after sowing: carrot seed hates a dry crust.
When to plant carrot in your zone
Free month-by-month sowing and transplanting lists, built from frost dates for your USDA (United States Department of Agriculture) hardiness zone.
Soil & water for carrot
Soil & pH
6.0-6.8
Deep, stone-free, sandy loam. One rock or fresh manure lump = one forked carrot.
Fork the bed 12 in deep. Only well-finished compost, never fresh manure or high N (causes hairy roots).
Watering
1 in / week; keep the top 1 in moist for the first 14 days
Fine sprinkle until germination, then deep drip. A burlap or board cover for the first 10 days keeps seed from drying out.
Carrots and parsnips crack when a dry spell is followed by a big soak. Keep the top 2 inches of soil just slightly damp for the whole season, not bone-dry then flooded.
Knowing when to harvest
- Shoulder diameter you can see at the soil surface matches the variety's expected size.
- Loosen with a fork before pulling; carrots snap easily.
- Frost sweetens carrots. The plant converts starch to sugar as protection.
Storing & keeping
Twist tops off (leaves wick moisture). Store in damp sand or perforated bag at 32-38°F for 4-6 months. Mulch heavily and harvest through winter in zone 6+.
What to expect
Per plant: 1 root (obviously)
Per sq ft: 16-24 carrots per sq ft in blocks
Troubleshooting carrot
Forked or hairy roots
Likely cause: Rocks, fresh manure, or high nitrogen
What to do: Deep-fork bed, use only aged compost, never fresh manure.
Rust-fly tunnels
Likely cause: Carrot rust fly maggots. Worse in fall crops
What to do: Row cover from sowing; harvest fall carrots by mid-October in the North.
Poor germination
Likely cause: Seed crust from a dry surface
What to do: Cover with burlap or a board for 10 days; water lightly twice daily until sprouts appear.
Varieties worth growing
Napoli (Nantes-type)
Sweet, blunt-tip; the best beginner carrot.
Danvers 126 (heavy-soil)
Tapered and tough. The choice for less-than-perfect soil.
Purple Haze
Anthocyanin-rich purple exterior, orange core: kids love them.
Growing carrot in containers
12+ in deep container. Round or half-long varieties (Parisian, Little Finger) work best in shallow soil.
Nutrition
Beta-carotene, vitamin K, luteolin (parsley). A nutrient bargain per square foot.
Common questions
Why won't my carrot seed germinate?
The soil crusted over. Keep the top 1 in continuously moist for 14 days. Use a board or burlap cover if you can't check twice daily.
Can I store carrots in the garden over winter?
Yes in zone 6+. Mulch 12 in deep with straw after the first hard frost and dig as needed until March.
Where these numbers come from
- USDA Plant Hardiness Zone Map (2023 revision). Zone assignment and the 30-year normals behind every cold-hardiness figure.
- NOAA NCEI 1991-2020 Climate Normals. Frost dates, growing-season length, and the probability bands on both.
- Cornell, UMN, and UC Davis Cooperative Extension crop guides. Spacing, days to maturity, soil pH targets, and per-plant yield ranges.
- USDA FSIS / FDA Produce Safety guidance. Wash, cure, and cold-storage handling numbers.
Ranges are regional guidance, not a promise for your yard. Your own logged results always override the published range.