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An experiment was conducted for two crop seasons (fall and spring) to determine the influence of location and number of drip irrigation lateral tubes on the growth and yield of tomatoes (Lycopersicon esculentum Mill.). Comparisons of one and two lateral tubes per plant row and lateral distances from the plant row of 24 cm (10 in.) and 12 cm (5 in.) were assessed. The soil-water potential, root density and distribution, plant height, dry matter accumulation, and quantity of fruit were measured. Two lateral tubes per plant row significantly increased yield for the spring crop, while for both seasons laterals located 24 cm (10 in.) from the plant row resulted in greater average yield than those at the 12 cm (5 in.) distance regardless of lateral number.