How to Grow Carrots: 5 Tips for a Better Harvest

Carrots are one of our family’s favorite vegetables to grow. There’s nothing quite like pulling one from the garden, rinsing it off, and eating it right there.

They’re also one of those crops that seem simple until you try to grow them. The biggest challenges are planting at the right time, keeping the tiny seeds moist long enough to germinate, and thinning the seedlings so the roots have room to develop.

Get those things right, and carrots are pretty easy to grow. Here are five things that make the biggest difference.

1. When and Where to Plant Carrots

When to Plant Carrots

Carrots grow best in cool weather. Plant seeds directly in the garden when soil temperatures are between about 45°F and 85°F (7°C to 29°C). The roots develop their best flavor and sweetness when they mature in cool soil.

In the low desert of Arizona, I start planting carrots around mid-September, but I watch the weather before I sow. I’m looking for nighttime temperatures in the 70s and daytime highs that are starting to drop.

If we’re still in a September heat wave, I wait. Carrot seeds are planted shallowly, and hot, dry soil makes germination much more difficult.

Once conditions improve, plant carrots throughout the cool season. Plant the last seeds before March. Use March planting mainly to fill a few empty spots; plant most of your carrots earlier so they have time to develop before temperatures climb.

Carrots are one of 10 go-to vegetables I recommend for fall gardens in the low desert and other mild climates.

Where to Plant Carrots

Choose a spot with loose, well-drained soil free from rocks and fresh manure. Rake the bed smooth before planting. Compacted or rocky soil can cause roots to fork or become misshapen.

Carrots also grow well in containers and grow bags as long as they’re deep enough for the variety you’re growing.

2. Plant Carrot Seeds Directly in the Garden

Don’t buy carrot transplants. Carrots develop a taproot almost immediately and don’t like having that root disturbed. Learn more about crops with sensitive roots in this guide. Sow seeds directly where you want them to grow.

Plant seeds about ¼ inch (0.6 cm) deep.

Carrot seeds are tiny, so use whichever type makes planting easiest for you:

• Regular seeds: The least expensive option, but the tiny seeds can be difficult to space evenly.
• Seed tape: Seeds are already spaced along biodegradable tape, which can make planting faster and reduce thinning later.
• Pelleted seeds: A coating makes each seed larger and easier to handle and place individually.

Carrots come in many colors beyond orange. You can grow purple, red, yellow, white, and orange varieties in different shapes and sizes.

• Danvers varieties are sweet, crisp, full-flavored, and easy for the home gardener to grow. Best for eating fresh and shorter storage.
• Imperator varieties store well.
• Chantenay varieties are good all-purpose carrots that can handle heavy soils.
• Nantes types are best for fresh eating and are often considered the sweetest and most tender type of carrots.

3. Germination and Thinning: The Two Keys to Successful Carrots

Help Carrot Seeds Germinate

Carrot seeds germinate slowly, and the top layer of soil needs to stay consistently moist while you wait. This is often the hardest part of growing carrots, especially during our warm fall weather.

After planting, water gently so you don’t wash the tiny seeds away. Check the soil often and water as needed to keep the surface from drying out. In warm, sunny weather, that may mean watering more than once a day until the seeds germinate.

In hot weather, I sometimes cover the planted area with burlap or a board to help retain soil moisture. Check underneath every day and remove the covering as soon as you see seedlings emerging. A thin layer of straw or wool can also help keep the soil moist without removing the covering.

Once the seedlings are up, gradually transition to deeper, less frequent watering.

Thin Carrots So the Roots Have Room to Grow

Don’t skip thinning. Crowded seedlings may give you lots of carrot tops but small, skinny roots underneath. About two weeks after germination, remove seedlings that are touching. A couple of weeks later, thin again so the remaining carrots are about 2 to 3 inches (5 to 7.5 cm) apart.

If pulling seedlings disturbs the carrots you want to keep, snip the extras off at soil level instead. Give the remaining carrots enough room, and they’ll have a much better chance of developing full-sized roots.

4. Caring for Carrots as They Grow

Once carrots are established, they don’t need much attention, but consistent moisture makes a big difference.

Water deeply and consistently. Aim to moisten the soil about 6 to 12 inches (15 to 30 cm) deep. Avoid letting the soil dry out completely and then soaking it, since sudden moisture changes can cause roots to split. Learn more about watering your garden in this guide.

Keep weeds under control. Carrot seedlings don’t compete well with weeds, especially when they’re young.

Add a light layer of mulch. About 1 inch (2.5 cm) of straw, leaves, or another organic mulch helps keep the soil evenly moist and moderates soil temperature. Here’s how and why you should apply mulch.

Feed the soil, not the tops. Carrots aren’t heavy feeders. Compost-rich soil is usually enough. Too much nitrogen can give you beautiful foliage without much root underneath.

Cover exposed shoulders. As carrots grow, the tops of the roots may push above the soil. Gently pull soil or mulch around exposed shoulders so sunlight doesn’t turn them green and bitter.

If carrots suddenly send up flower stalks instead of developing roots, they may be bolting. If this has been an issue for you, I wrote an article to help: Why Carrots Bolt (and What to Do About It)

White patches on the foliage later in the season may be powdery mildew. Find out how to fix it in my article on powdery mildew on carrots.

5. Know When to Harvest

Don’t rely only on the number of days listed on the seed packet. Gently brush soil away from the top of the root and check its size.

Most carrots are ready when the shoulder measures about ¾ to 1 inch (2 to 2.5 cm) across, though mature size depends on the variety.

Harvest the largest carrots first. Removing them gives smaller carrots nearby a little more room to finish developing.

In cool weather, carrots can stay in the ground until you’re ready to use them. In the low desert, harvest before temperatures get hot. Carrots left in warming soil too long can become woody, bitter, or more likely to bolt.

For storage:

• Remove the foliage, leaving about 1 inch of stem. The greens continue pulling moisture from the root after harvest.
• Let washed carrots dry before refrigerating them.
• Store them in a sealed bag or container in the refrigerator.
• Scrub homegrown carrots well before eating. Peeling is optional.

Freeze-drying carrots is a simple way to preserve extra harvests. Learn more about freeze-drying in this blog post.

Get my favorite recipe for garden fresh vegetable stock in this post.

Frequently Asked Questions About Growing Carrots

Want to grow carrots in a container or pot? Check out this guide to see which vegetables thrive in containers—including carrots.