To stabilize onion prices throughout the year, cultivation of onion in rabi and kharif season is well accepted. It not only fulfills consumer demand but also provides high remuneration to onion farmers. Production of onion in kharif and late kharif season is a new strategy adopted to supply the fresh onion during November onwards. Recommendation of varieties and their successful cultivation was not done under sub-tropical conditions of Jammu though. Grading of bulbsets was done on the basis of sizes as Grade-1 (3.05cm), Grade-2 (2.55cm), Grade-3 (2.20cm) and Grade-4 (1.55). An investigation was carried out at Division of Vegetable Science, SKUAST-J, Chatha during 2018-2019 to evaluate kharif varieties developed through bulbsets of different sizes by sowing them on different dates. Bolting which started in the plants from the second week of January showed an increasing but non-significant trend among different grades of bulbsets. However, significant differences were found among the varieties with maximum percentage (26.48%) recorded in Selection-1 as compared to minimum (8.28%) in Bhima Red. Size of the bulbsets showed a significant trend as compared to varietal response. Grade-I (D1) showed statistically minimum days (15.50) for 50% sprouting as compared to other size of bulbsets with a maximum days (18.83) in Grade-IV of bulbsets (D4). Neck thickness was significantly influenced by varieties and dates of sowing but their interaction indicated non-significant results. N-53 recorded minimum neck thickness (0.95cm) whereas maximum thickness (1.40cm) was recorded in Selection-1. Large sized bulbsets recorded maximum neck thickness (1.28cm) as compared to small sized bulbsets (1.14cm). Selection-1 took maximum days (151.41) for marketable maturity while Bhima Red took minimum (125.58) days. Among the grades, bulbsets of Grade-IV (D 4) took maximum days (147.25) to maturity as compared to Grade-I (D1) which took minimum 134.50 days. However, non-significant results were recorded in the interaction. The maximum average bulb weight (117.13g) and total yield (449.03q/ha) was recorded in Grade-I (D1) of Bhima Red, sown on 1st February. Significantly maximum marketable bulb yield of 409.14q/ha was obtained in Grade-I of Bhima Red, giving highest cost benefit ratio of 1:3.55.Lowest marketable bulb yield of 174.55q/ha with cost benefit ratio 1:0.95 was observed in Grade-IV of Selection-1.