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Due to climate change and for stable crop production, protected facilities such as greenhouse and plant factory have drawn interest and the area is increasing in Korea as well as in other countries in the world. Farmers should be present and visit frequently to the production site for maintaining optimum environmental conditions and better production, which is time and labor consuming. Remote monitoring systems using either mobile devices (e.g., cell phone) or internet-accessible computers have been developed. Objectives of the paper were to construct a greenhouse simulator of which the environments could be monitored electronically and automatically, and to evaluate remote monitoring of the environments using mobile devices under various conditions. A small-sized greenhouse with dimensions of 2.63.82.2 m (WLH) was constructed as a simulator. Monitoring variables were status of window motor, ventilation fan, light, and irrigation pump, and also sensor values of air temperature and humidity, luminous intensity, and soil water content. Sensor values were collected through wireless communication devices. The collector was interfaced with a desktop computer (i.e., control center) and monitoring algorithms for different monitoring scenarios were programmed. Remote monitoring was implemented using short text message under CDMA 2G communication and IP address access (i.e., internet access) under 3G or Wi-Fi communication conditions.