How long does it take for carrot seeds to grow? For a continued harvest, plant carrots every 4 weeks through midsummer. For southern gardens, plant in early spring or late summer, with fall often yielding sweeter carrots due to cooler growth conditions. · carrots mature in 55 to 80 days , depending on the variety and other growth factors. · carrots typically take 70-80 days to mature, depending on the variety you choose. Find out the differences between varieties and the effects of weather on carrot growth. How long does a carrot grow? · the radishes will grow quickly, and by the time the carrots really start to grow , they can be harvested. · carrots thrive in cool weather with loose, well-drained soil, and take about 60 to 90 days to mature depending on the variety. Find out the best time, soil, and temperature for planting, thinning, and watering carrots. Learn how long carrots take to mature, when to harvest them, and how to avoid damaging them. · learn how carrots grow from seed to harvest in 2 to 4 months, depending on the variety. Weather conditions play a huge role in how quickly your carrots grow. Inconsistent or inadequate watering, overcrowding, and overfertilizing can prevent carrots from reaching mature size at the proper time. Baby carrots can be harvested earlier, around 50-60 days, while larger varieties might need up to 90 days to reach full size. Carrots are typically ready to harvest when theyre about 1 inch thick.