Your Cool Home is supported by its readers. Please assume all links are affiliate links. If you purchase something from one of our links, we make a small commission from Amazon. Thank you!
The best time to plant carrots and radishes depends on the crop, but as a general rule, carrots are best planted in early spring or late summer, while radishes can be planted in early spring and again in late summer to early fall.
Both are cool-season crops that prefer mild temperatures, so timing your planting around the heat of summer is the key to a healthy harvest.
If you’ve been wondering when to plant carrots and radishes for the best results, the short answer is simple: plant them when the soil is workable and the weather is cool.
In this post, we’ll break down exactly when to plant carrots and radishes, how to time your plantings by season, and a few tips to keep both crops thriving.
Let’s dig in.
When to Plant Carrots and Radishes
When to plant carrots and radishes comes down to working with the seasons rather than against them, and here’s how to time each one.
1. Plant Carrots in Early Spring
Carrots are cold-tolerant, so you can plant carrot seeds outdoors about two to three weeks before your last expected frost.
The soil should be at least 40°F (4°C) for the seeds to germinate, though they sprout fastest when the soil warms to around 55–65°F (13–18°C).
This early spring window is when to plant carrots if you want a steady supply through early summer.
2. Plant Radishes Even Earlier
Radishes are one of the quickest and hardiest cool-season crops, so you can plant radish seeds as soon as the ground can be worked in spring.
They tolerate cold soil better than most vegetables and germinate in just a few days.
This makes radishes a great choice for gardeners who are eager to get started when learning when to plant carrots and radishes together.
3. Take Advantage of a Fall Planting
Both carrots and radishes also shine in a second planting season.
About six to eight weeks before your first fall frost, sow another round of seeds for a cool-weather harvest.
Fall-planted carrots often taste sweeter after a light frost, and radishes mature fast enough to beat the cold.
How to Time Your Planting by Season
Knowing when to plant carrots and radishes is easier when you think in terms of seasons and soil temperature.
1. Watch the Soil, Not Just the Calendar
The soil temperature matters more than the date on your calendar.
Carrots and radishes both germinate best when soil stays between 50°F and 65°F, so grab a soil thermometer if you want precision.
2. Avoid the Peak of Summer Heat
Hot weather makes carrots woody and pushes radishes to bolt and turn pithy.
That’s why when to plant carrots and radishes should always steer clear of midsummer, or use partial shade and consistent watering if you must plant then.
3. Succession Plant Every Few Weeks
For a continuous harvest, sow small batches of radishes every two to three weeks in spring and fall.
Carrots can be succession planted too, spacing plantings about three weeks apart so you’re never overwhelmed at harvest time.
Tips for Planting Carrots and Radishes Together
Once you’ve nailed down when to plant carrots and radishes, a few smart habits will keep both crops happy.
1. Loosen the Soil Deeply
Carrots need loose, rock-free soil to grow straight roots, so dig down at least eight to ten inches before planting.
Radishes are less fussy but still appreciate crumbly, well-drained ground.
2. Keep the Soil Consistently Moist
Both crops need steady moisture to germinate and develop tender roots.
Water gently and regularly, especially during dry spells, but avoid waterlogging the soil.
3. Thin Seedlings Promptly
Carrots especially need thinning once they’re an inch or two tall, or the roots will stay small and crowded.
Radishes usually need a little thinning too, so give each plant room to size up.
4. Pair Them as Companion Plants
Radishes grow fast and can mark rows while slow-sprouting carrots find their footing.
This makes them a smart pair when you’re planning when to plant carrots and radishes in the same bed.
So, When to Plant Carrots and Radishes?
When to plant carrots and radishes comes down to cool weather and workable soil, with carrots going in early spring or late summer and radishes following a similar schedule.
Time your plantings around mild temperatures, keep the soil moist and loose, and you’ll enjoy crisp, flavorful roots for months.
Hope this post has helped you understand when to plant carrots and radishes so both crops thrive in your garden.