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Late frost damage often occurs in early spring, tea plant is very vulnerable to frost damage which would seriously affect the output and quality of tea. The temperature distribution of early spring in hilly tea garden was studied based on the growth characteristics of tea, the experimental study indicated that the temperature between day and night was very different and there was a significant change in humidity, besides the regional temperature distribution was uneven temporally and spatially. A new monitoring technology based on wireless sensor networks was introduced considering the characteristics of the hilly tea garden, and the frost monitoring method for tea plant was afforded. The wireless sensor nodes configuration and the reliability of data transmission were tested on the real hill and the result was that the use of star-based network in potential frost region can meet the requirements to achieve the purpose of frost monitoring.