Pumpkin seeds are used either as a source of oil for salads in general or as an appetizer. The seeds of oilseed pumpkin are used as a natural medicine for prophylaxis of being prostate hyperplasia. The fruit and seed yield and oilseed content of this plant obsvered that different sowing times were found to be effective on seed yield and fat contents of the seeds. This research was carried out to determine the effects of 4 sowing dates ( 7 may , 15 may , 24 may and 1 June ) on fruit, seed and oil seed yield of naked seed pumpkin ( Cucurbita pepo var. styriaca cv. Kakai ) under Mashhad / Khorasan ecological conditions during 2002 – 2003 . The results showed that in late sowing times the oilseed content decreased from from 46.5 % (sowing at 15 May) to 37.92 % (sowing at 1 June). The seed yield (seed number per fruit and 1000 seeds weight) decreased at lat sowing times. Other characteristics such as internode length to first female and the time of seed sowing to seedling emergence, decreased, and female flower formation shifted to lower node. The harvesting date for late sowing times increased but without significant different between all of treatments.

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