In order to evaluate the effects of planting date and the time of weed control at different growth stages of dill on the density, dry weight of weeds, growth criteria, yield components, seed yield and essential oil yield, an experiment was conducted as factorial based on a randomized complete block design with three replications at the Agricultural Research Station, Shirvan College during the growing season of 2011-2012. Factors included four planting dates (22^nd December, 21^st January, 20^th February and 20^th March) and three weed control stages (the first true leaf, start of branching and beginning of flowering stages). The results showed that the simple and interaction effects of planting date and time of weed control were significant on the density and dry weight of weeds and plant height, biological yield and essential oil yield of dill. By delaying planting date from 22^nd December to 20^th March at the first, second and third sampling stages, the weed density was declined up to 27, 45 and 13%, respectively. The highest seed yield was observed in the weed control at the emergence of true leaf with 59.85 g.m^-2. By delaying planting date yield and the components of dill decreased higher than 100%.  The highest essential oil yield was recorded in the first planting date and he weed control at the emergence the true leaf with 26.48 g.m^-2 and the lowest with 1.57 g.m^-2 was for the fourth planting date and the weed control in umbel emergence.