The aims of the study were to investigate the effect of sowing time on the phenotypic response of sweet corn hybrids cultivated during the fall-winter period, with supplementary irrigation, in Northwest Region of Paraná State, where has a Subtropical climate, without a specific dry season. The treatments consisted of the combination of four sowing dates (02/18; 03/04; 03/18; 04/01) and two commercial sweet corn hybrids (Tropical Plus and RB6324) in two years (2011 and 2012). The characteristics

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... assessed were growth, production component, phenological cycle and accumulated thermal sum. The sweet corn plant growth was limited by delay in the sowing time that negatively affected the production components. The postponement of sowing time did not influence the accumulated thermal sum, although the number of days to harvest of the plants sown on February 18 th and April 4 th were, respectively, 93 and 120 days. The hybrid RB6324 presented the best productive performance and the second half of February was the preferential time for sowing sweet corn in the fall-winter period in the Northwest Region of Paraná State, Brazil.