— This paper proposes an environmental monitoring application based on the concept of Wireless Sensor Networks (WSNs). The goal of this application is to enable, through the measurement of relevant parameters, the constant evaluation of the state of the grass in the different zones of a golf course. The environmental monitoring systems currently installed on most golf courses uses a single weather station. This weather station only gives general data about the weather conditions of the region where the course is located and doesn’t allow green keepers to distinguish the irrigation needs of the different zones of a golf course. By continuously monitoring the soil condition in real time on all the zones of a golf course it is possible to obtain a more detailed vision of the grass water needs and of the hydrological behaviour of each soil, thus improving irrigation efficiency.