Climate of Pakistan provides suitable conditions for vegetable production. Growing of vegetables in tunnels is the efficient way of producing off-season vegetables. Research was executed to see the growth and yield of bitter gourd by planting in low tunnel on different sowing dates. The variety that was used the name is Cobra seed were taken from Sohail sons Dijkot road, Faisalabad. Raised beds were used for sowing of seeds on different dates at vegetable research area UAF. Reproductive and vegetative attributes were analyzed through standard procedures. Experiment was executed according to Randomized Complete Block design with 4 replicates. Data were collected and evaluated by ANOVA techniques and comparison of means were made through LSD test at 5% probability level. Date of sowings were indicated the deviations among vegetative growth like days taking for germination, length of vine, numbers of leaves, and the reproductive growth like weight of fruit, diameter of fruit, and the chemical parameters were also checked like phenolic contents, chlorophyll contents, vitamin C, protein and carbohydrates contents of bitter gourd. Treatment T3, Cobra variety was indicated that improved the vegetative developments, numbers of leaves and length of vines and also represented that the more reproductive development. So, it was decided that the sowing of Bitter gourd is best in January for maximum vegetative and reproductive growth.