Onion variety Agri Found Light Red was grown at increasing plant densities viz; S1: 15 x 10 cm; S2: 15 x 15 cm; S3: 20 x 15 cm and different transplanting dates P1: 15th November; P2: 25th November; P3: 5th December; P4: 15th December and P5: 25th December. The experiment was laid out in a Randomized Block Design with Factorial Concept (FRBD) with three replications and 15 treatment combinations, comprising of 5 levels of transplanting dates and three levels of spacing. Results revealed that different transplanting dates and spacing indicated significant effect on different characters viz., plant height, polar diameter, equatorial diameter and number of leaves per plant but failed to show significant effect on days to maturity, % bolters, % jointed bulb and T.S.S. Among the different transplanting dates early planting P1 (15th November) recorded the highest vegetative growth (80.9 cm), marketable yield (29.87 t/ha) and total yield (30.58 t/ha). Among the different spacing, S1 (15 x 10 cm) showed significant effect on marketable yield (32.67 t/ha), total yield (33.59 t/ha) and number of bulb (644786.1) harvested per hectare as compared to remaining treatments. Onion transplanted on 15th November and 15 x 10 cm spacing significantly improved the number of bulbs harvested per hectare (650085), marketable yield (34.65 t/ha) and total yield (35.30 t/ha).