In the milder areas of the state, July is a good time to put in more carrots for fall and winter harvest, according to Pat Patterson, program assistant with the home horticulture program of the OSU Extension Service.
Carrots grow best in deep, well-drained sandy or peaty soils.
Raised beds, worked to a depth of 12 to 15 inches provide optimum drainage and allow for maximum root length and smoothness. Hard soil clods, uncomposted manure or fertilizer granules may cause carrots to fork, become hairy and crooked. A soil pH of 5.5 to 7.0 is optimal. If your soil is heavy, grow the round carrot varieties such as Thumbelina. Sprinkle seed thinly in furrows a half-inch deep, with rows 12 inches apart.