Off-season onion production of is an important issue to challenge the price fluctuation during different time of year and in different location of the country. The present experiment was conducted at sub-tropical region of central Uttar Pradesh (Lucknow) during kharif, late kharif season of 2018-20 to find out the optimum date of transplanting and choice of suitable cultivar of onion for off-season production. The experiment consisted of eight dates of transplanting (30th August, 10, 20, 30th September, 10, 20, 30th October and 10th November) and two cultivars (Agrifound Dark Red and L-883) which was laid out in factorial randomized block design with three replications. Transplanting on 30th September showed maximum vegetative growth in terms of plant height (66.93 cm), number of leaves per plant (14.99), maxi-mum length of leaf (47.60 cm), neck thickness (23.19 mm) at 120 days after transplanting as well as highest average bulb weight (79.53 g) and bulb yield ( 10.02kg/plot and 382.68 q/ha). Among the two varieties L-883 showed the better performance in respect of growth and yield in off season production. Therefore, it may be concluded that the cultivation of L-883 variety and transplanting on 30th September was found best for off –season production in the sub –tropical agro- climatic region of Center Uttar Pradesh (Lucknow) which may be beneficial for increasing farmers’ income as well as for benefit of costumers keeping the balance between demand and supply.