Carrots Sam Cotner, Extension Horticulturist Texas Agricultural Extension Service Carrots grow best in cool temperatures of early spring and late fall. Night temperatures of 55 degrees and day temperatures of 75 degrees are ideal for carrots.
High temperatures cause poorly colored, low quality carrots.
They will grow in some shade and do well in small gardens and flower beds. Soil Preparation and Fertilization Carrots do best in loose, sandy loam soils which are well drained. In heavy soils they mature slower and often the roots are rough and unattractive. Clear the soil surface of rocks, trash and large pieces of plant material. Small, fine pieces of plant material can be turned under for soil enrichment.