Despite the progress of the livestock industry in Iran, the production of forage plants commensurate with this development has not been considered. Therefore, this study in 2017, with the need to produce feed for livestock and poultry and with the aim of determining the best density and planting date on the quantitative and qualitative characteristics of Guar forage, was conducted in the Rasht Rice research Institute-station located in the Village of GilPordehsar in the Sangar city. In this experiment, four planting date (May 12, May 26, June 9, June 23) and three plant densities (200, 400 and 600 plant.ha-1) were evaluated factorially in a randomized complete block design with three replications. The results showed that the planting date of May 26 and the density of 600 plant.ha-1 in terms of fresh forage yield (35.02 t/ha), crude protein (19.02 percent), dry matter (54.35 percent) and carbohydrate (26.12 percent) was superior to other planting dates and plant density under test. The highest yield of dry forage (6.1 t/ha) and neutral detergent fiber (58.23 percent) was observed on May 12 and a density of 600 plant.ha-1. The amount of crude fiber increased with delay in planting, but the percent of Ash was not affected by different planting dates and densities. According to the results obtained in the present study, in order to obtain the highest quantity and quality of forage in Guilan province, the planting date of May 26 and the density of 600 plant.ha-1 is recommended.