Carrots grow best in cool weather and deep, well-draining soil. To get a head start on the growing season, plant carrot seeds in a greenhouse in late winter. When the ground has thawed and the air temperature is around 60 degrees F, transplant the seedlings outside. Carrots mature in 58 to 70 days depending on the variety, but you can always pull a few early for a tasty summer treat.
Spread a 2-inch layer of well-rotted manure or rich compost on the planting bed. Till the organic material into the top 10 to 12 inches of the soil.
Using a small trowel, make holes that are slightly larger than the root ball of the carrot seedlings. Space the planting holes 1 inch apart. Space multiple rows 12 inches apart.
Prick the seedlings from the seed tray when they are 1 inch tall. Drive a dowel into the soil next to a group of seedlings and gently lift up. Tease the seedlings apart with your fingers to avoid damaging the roots.
Hold one seedling over a planting hole so the base of the stem is level with the surrounding soil. Dig the holes deep enough to allow the roots to hang straight down when you hold it the seedling over the prepared hole.
Push soil around the seedling so that it is secure in the hole. Continue along the row until all the seedlings are transplanted. Water the soil until it is damp to a depth of 2 inches to settle the seedlings into their new environment.