The article studies the influence of the long-term storage of type I cements and green cement composites in conditions of unimpeded interaction with the environment on the physical and mechanical properties of cement stone. The retrieved results indicate that due to the caking process, the specific surface area decreases significantly, in type I cements (MC, LC) on average by 25%, and in green cement composites (LCAS, LCAF) this process develops less intensely and amounts to 15%. A similar consistent pattern is observed while measuring the angle of natural repose and bulk density. A significant reduction of the angle of natural repose by 7 to 9.5° and big values of bulk density in type I cements (MC, LC) are related with the active sorption of moisture from the environment, which leads to the formation of hydrate “bridges” upon interaction of the particles. This process is acknowledged to affect the decrease of the ultimate compressive strength compared to that in control samples on average by 25…30% in type I cements and by less value of 15…20% in green cement composites stored in the open air for 30 days.