When to Plant Carrots

Written & researched by Elena Marsh Gardening & Landscaping Editor

Updated July 2026

When to plant carrots: sow the first crop in spring 2 to 3 weeks before your average last frost, as soon as the soil is workable and has reached at least 45F — carrots germinate best between 55 and 75F. Then sow a fall crop by counting back 10 to 12 weeks from your first fall frost date. Carrots are cool-season roots that turn bitter in summer heat, so in most of the country you plant in spring and again in late summer, skipping midsummer. In mild zones 8 to 10, plant through fall and winter instead.

The timing question for carrots is really a soil-temperature question. Carrot seed is famously slow and fussy to germinate, and getting the sowing window right — cool but not cold, moist, and out of summer heat — is most of the battle. We do not run trial rows ourselves; this reflects extension-service guidance and aggregated grower reviews, as described in how we rank.

Spring and fall windows by zone

Use your USDA zone to place both sowing windows. The spring window opens when soil warms past 45F; the fall window is set by counting back from first frost.

These are guides — your local last and first frost dates, available from any regional extension service, give you the precise anchor. The spring sowing counts back from last frost; the fall sowing counts back from first frost.

Why soil temperature matters more than the calendar

Carrots are direct-sown and germinate on the soil clock, not the air clock. Below 45F the seed just sits, vulnerable to rot; the 55 to 75F band gives the fastest, most even emergence, still taking 14 to 21 days. Above 85F germination is poor to nonexistent, which is exactly why summer sowings in hot regions disappoint. Push an inexpensive soil thermometer into the bed at a quarter-inch depth (the sowing depth) and read it mid-morning. In spring, wait for a reliable 45F-plus; in late summer, wait until the worst heat breaks or shade the bed to bring the surface temperature down.

The fall crop is the sweet one

If you grow carrots only once, make it a fall crop. Roots that size up as the weather cools and then sit through the first light frosts convert starch to sugar and taste dramatically sweeter than summer-harvested carrots. To time it, count back the variety days-to-maturity (60 to 80) plus about two weeks for slow germination and slow late-season growth — 10 to 12 weeks before first frost is the practical rule. In cold zones you can then mulch the bed heavily and harvest through winter; in mild zones the roots simply hold in the ground.

Succession sowing for a steady supply

Because carrots hold well and mature over a wide window, sowing a short row every 2 to 3 weeks within each season beats sowing one big block that all matures at once. A simple plan for a cold-winter garden: sow in early, mid and late spring, pause through summer heat, then sow again in mid and late summer for fall and storage. In mild climates, run successions right across the cool months. Pair this with the direct-sow approach detailed in how to grow carrots and best vegetables to direct sow.

Keeping the sowing alive through germination

Timing gets you nothing if the seed bed dries out during the long germination window. Whatever the season, the surface must stay constantly moist for 2 to 3 weeks — a single hot, dry afternoon can wipe out a sowing. Water gently every day, and cover the row with a board or damp burlap until sprouts appear, checking daily. In warm late-summer sowings this is doubly important, since the soil dries and heats fast. Sow shallow (a quarter-inch) and use fresh seed each year, because carrot seed loses viability quickly and old seed germinates poorly and unevenly. A light scattering of fast-sprouting radish seed along the row is a traditional trick: the radishes emerge within days, marking the row so you can water and weed it accurately, and are pulled long before the carrots need the space.

Timing mistakes to avoid

• Sowing into cold, wet soil. Seed rots before it sprouts. Wait for 45F and workable ground.
• Sowing in peak summer heat. Poor germination and bitter, woody roots. Skip midsummer in hot regions.
• Missing the fall window. Sow too late and short days and hard freezes stop the roots before they size up.
• Transplanting to get a head start. Carrots resent root disturbance and fork or stall. Always direct sow.
• One big sowing. Everything matures at once. Succession sow instead.

Overwintering carrots in the ground

One of the best-kept secrets of carrot timing is that you rarely need to lift the whole fall crop at once. Carrots are cold-hardy, and in most zones you can store them right where they grew, harvesting fresh through late fall and winter. After the first hard frosts, pile 6 to 12 inches of straw, shredded leaves or other loose mulch over the row, extending it a foot or so beyond each end. The mulch keeps the ground from freezing solid so you can pull roots as needed, and the cold holds them in a natural refrigerator that keeps improving their sweetness. In zones 3 to 5, add even more mulch and consider a row cover or low tunnel over the top for the hardest months. In mild zones 8 to 10 the roots simply sit in the cool soil with little protection. Mark the row before snow covers it, and harvest before the ground thaws and refreezes repeatedly in spring, which turns roots woody and prompts them to bolt. This in-ground storage is why a well-timed fall sowing is worth so much more than a summer one.

After you sow

Once your carrots are up, the work shifts to thinning, even watering and keeping the crowns covered. The full growing method — soil prep, thinning, avoiding forked roots — is in how to grow carrots, deep-bed sizing is in how deep a raised bed should be for carrots, and companion pairings are in the companion planting chart. Start anywhere from the seeds and vegetable growing hub.