This study was carried out in 2016 in Selçuk University at the Faculty of Agriculture Greenhouse and Laboratory Research and Application for the determination of the agronomic characteristics of cool climates cereals in order to investigate the yield and some technological properties of cool climate cereal grass water. In this paper, registered seeds of four different genus of grains were used as material which obtained from Bahri Dağdas International Agricultural Research Institute from Republic of Turkey Ministry of Agticulture and Forest and Department of Field Crops from Selçuk University at Faculty of Agriculture. The lawn was harvested in grass period as were grown varieties of four different cereal genus (Konya-2002, Aslım-95, Larende and Seydisehir) in controlled greenhouse conditions. The amount of wet grass water was accounted thanks to these seed used. The highest value of fresh grass were produced by a total of 770g weight barley and 200g the lowest rye. Moreover, grass water yield was obtained the highest volume of 590g barley and the lowest point of 150g rye. Oat chlorophyll-a 4.96 mg/L and chlorophyll-b 8.25 mg /L content were emerged tremendously in grass waters. In contrast wheat, chlorophyll-a amount 1.83 mg / L and chlorophyll-b amount 3.25 mg /L as were found to be the lowest value detected. Indeed, in the crude protein ratio, the highest ratio was obtained from rye 0.56% the genus whereas the lowest crude protein ratio is if 0.51% detected. The total amount of flavonoids in grass water, wheat grass water with 17.21 mg/g reached the highest value, while the lowest value of rye grass water was determined as 0.22 mg/g. Total amount of flavonoids in wheat grass water was found to be highest with 17.21mg/g as opposed to rye grass water has the lowest value with 0.22 mg/g. In terms of the total amount of phenol, rye grass water has the highest value of 34.79mg/g but barley and wheat grass waters were found to be equal to 15.70mg/g and as well the lowest amount. As regards antioxidant activity rye grass water (12.75 mg /g) was found to be the highest value.