A field experiment was conducted at BCKV during rabi, 2012-13 to study the effect of three sowing dates (November 1, November 15 and November 30) on phenology, growth and yield of four varieties (HUL 57, Moitree, KLS 218 and Ranjan) of lentil. Delay in sowing of four lentil varieties from November 1 to 30 reduced the duration by 11.1 days (114.7 vs. 103.6 days). Mean cultivar days of lentil from sowing to emergence, flower initiation, pod initiation and maturity were 10.4, 54.2, 73.1 and 108.7 days, respectively. Lentil sown on November 15 produced the highest seed yield (908.6 kg ha-1), which was 2.72 and 16.09% higher over earlier (1 November) and later sowing (30 November) dates, respectively. Among four varieties, HUL 57 recorded the highest plant height (41.3 cm), number of nodules plant-1, dry matter yield, number of pods plant-1 (105.7) and seed yield (887.8 kg ha-1). Thus, a 15-day period (first fortnight of November) could be recommended as optimum sowing time for lentil, but sowing of HUL 57 during early November appeared as promising for better seed yield in New Alluvial Zone of West Bengal.