Onion (Allium cepa L.) is one of the most important commercial vegetable bulb crops cultivated extensively in India and it belongs to family Alliaceae, having chromosome number 16 (2n = 2 x = 16). There is a critical gap in the supply of onions in the country from October to March and, as a result, the prices shoot up. A good harvest in kharif season can bridge the gap between demand and supply of onions during this dearth period. Further, production of onions during the kharif season offers a good alternative to farmers for obtaining higher returns. In view of the above aspects, the present investigation entitled, "Performance of onion (Allium cepa L.) cultivars as kharif crop under different dates of transplanting" was carried out. The present experiment resulted that 30 September transplanting was beneficial for getting higher yield and provided maximum profit to the growers Among the standardized varieties L-883 was found to be the best for kharif onion (Allium cepa L.) production especially in Lucknow condition of Central Uttar Pradesh.