Quinoa (Chenopodium quinoa Willd.) is grown for its tiny edible seeds. Its seeds are high in protein and fiber. The seeds are also high in fiber and oil and are a good source of iron, magnesium, phosphorus, potassium, calcium, zinc, copper, vitamin E, and a number of antioxidants. The plants are also frost-resistant, salt-tolerant, and can be grown in poor soils. Quinoa can be used in any number of sweet or savoury dishes and is commonly boiled like rice or ground as a flour to fortify baked goods. In recently, quinoa growing and consumption are increasing day by day in the world. This study was aimed to determine different sowing dates on the grain yield and some cluster and kernel properties of quinoa under Harran Plain Conditions. Research was conducted according to randomized complete blocks design with three replicates in Harran plain conditions in 2016, Sanliurfa, Turkey. Q-52 Quinoa (Chenopodium quinoa Willd.) variety was used as plant material. In the study 9 different sowing dates were used such as 15 February, 1 March, 15 March, 1 April, 15 April, 1 May, 15 May, 1 June and 15 June.  As a result of the research; statistically significant differences were seen between sowing dates at tested characteristics (P≤0.01). Cluster number of plant ranged from 10.3 to 16.0 numbers, branches number of main clusters from 18.0 to 32.3 numbers and main cluster length from 31.6 to 46.2 cm. Thousand kernel weights were between 2.325 g. and 2.426 g, hectoliter weight between 69.17 and 69.83 kg hl-1 and grain yield 168.0 kg da-1 and 226.8 kg da-1. It was seen that tested characteristics generally increased from 15 February to 1 April sowing dates, but after 1 April sowing dates decreased. The highest grain yield was obtained from 1 April sowing date with 226.8 kg da-1 whereas the lowest grain yield was seen at June 15 sowing date with 168.8 kg da-1.