This study was undertaken to determine the performance of some sweet corn (Zea mays L. var. saccharata) cultivars at different sowing dates under high altitude conditions. In this research, the seeds of 4 sweet corn cultivars (Zea mays L. var. saccharata cvs. 'Martha F1, Vega F1, Merit F1 and Sunshine F1') were used as plant material. It was determined that sowing date has a significant effect on the plant height, cob diameter and length, the number of kernels/cob, husked and de-husked cob weight, and total husked and de-husked cob yield. Due to the delay in sowing date, all examined parameters were reduced. Martha F1 compared to the other cultivars showed the best performance in terms of total husked and de-husked cob yield. The highest total husked (17260 kg ha-1) and de-husked (11818 kg ha-1) cob yield were determined in cv. Martha F1 in the first sowing date in both experiment years. In high altitude production areas such as Erzurum, sowing should be done as early as possible for high yield and quality in sweet corn. According to the results of the research, sweet corn can be produced successfully with sowing on 23 May in Erzurum. Also, all of the cultivars used in this research, especially cv. Martha F1 can be recommended to the sweet corn producer for high yield and quality.