Phenological development determines the period of vegetative and reproductive growth, assimilate partitioning and dry matter production. Planting time and density are the major factors affecting phenological development, assimilate partitioning and yield of faba bean. The aim of this study was to evaluate the effect of planting date and plant density on phenological development, assimilate partitioning and yield of faba bean. Faba bean was planted on eight dates from September 20 to December 27, 1999 with 14 days interval maintaining 4 density (150,000, 300,000, 450,000, 600,000 plants ha-1) at New Developmental Farm, NWFP Agricultural University, Peshawar. Planting dates and population density significantly affected days to flowering, days to maturity, grains pod-1, plant height and grain yield ha-1. However, days to emergence and maturity were only affected by planting date. Crop planted on September 20 took minimum days to emergence (5 days) and maximum days to flowering (57.6), maturity (204), produced more grains pod-1 (3.4) and taller plants (176.9 cm). Crop planted on October 4, 1999 produced maximum grain yield (4153 kg ha-1). Plant density of 450,000 plants ha-1 took maximum days to flowering (54.2), more grain pod-1 (3.2) and produced maximum grain yield (2498 kg ha-1), while population density of 600,000 plants ha-1 produced tallest plants (146.3 cm). It can be concluded that faba bean can be planted up to October 4 at 450,000 plants ha-1 to obtain maximum yield.