In this paper we analysed the results of maize planting time experiments by the Department of Crop Sciences and Applied Ecology of the University of Debrecen, Centre of Agricultural Sciences in 2001. We made the experiments at the experimental garden of DE ATC in Hajdúböszörmény. We examined in 2001, 2002 ten hybrids with three planting times. The results were analysed by analysis of variance with two factors. In 2001 the yields were high, between 7.2-11.6 t/ha. The seed moisture contant of hybrids was 6-8% less after early planting than after late planting. The vegetation period of the hybrids became longer after early planting, which helped the drying-down of the hybrid and determined the seed moisture content at harvest to a great extent. In 2002 the yields were high, between 4.02-10.47 t/ha. The seed moisture contant of hybrids was 5-14% less after early planting than after late planting. On the basis of the above, variety specific technologies should be applied where the planting time is adapted to the hybrids. In accordance with the other cultivation factors.