The experiments were conducted in haor area under the Sunamganj district during the period from November 2018 to March 2019 to observe the effect of planting dates on the yield of three winter vegetables. Experiment included three planting dates viz. 5 November (P1), 15 November (P2), and 25 November (P3), on three vegetables viz. Tomato, Turnip, and Squash were designed in RCBD with three replications. Yield and yield contributing data were recorded. Different planting dates had significant variations for all vegetables. The highest yield of tomato (86.42 t ha^-1) was recorded on 5 November planting, and the lowest was 44.03 t ha^-1 on 25 November planting. Gross return and net margin also secured the highest value in the first week of November with the highest BCR (5.38). In the case of turnip, similar trends were spotted. The highest gross yield was observed at 24.99 t ha^-1 on 5 November planting, with the highest BCR (4.16). The lowest gross yield (22.77 t ha^-1) was obtained on 25 November planting with decreasing BCR (3.79). Squash also gave better production on 5 November planting (61.1 t ha^-1) with the highest gross return and net margin over other dates. The results revealed that the first week of November found a better time for winter vegetables (Tomato, Turnip, and Squash) cultivation in haor area after the recession of floodwater.