The present study conducted during the period from March 18 to May 15, 2019, concerns the diagnostic analysis of vegetable farms in the lower Bagga Valley, located between the rural communes of Bambeye and Kalfou, in the department of Tahoua, in northwestern Niger. The aim was to make a socio-economic and technical diagnosis of vegetable farms, in order to classify them into homogeneous groups. To do this, the study was carried out in three villages of Bambeye commune (Bagga, Bagga Malamawa, Rididi) and three villages of Kalfou commune (Bagga Tabla, Chacott, Lilango), all of them bordering the Bagga Valley. Thus, a sample of two hundred and twenty-seven (227) market gardeners chosen in a reasoned manner was investigated. The typology of the farms is carried out on the basis of the classification in dynamic clouds. Thus, this study highlights three types of market gardeners that are distinguished by a number of variables, including structure, operation and performance. The different groups are type I, which are large, professional market gardeners with a great productive potential; type II, characterized by small traditional market gardening with limited productive potential and type III, which are medium-sized market gardeners, professionals with a high productive potential, who seek to maximize profit. The analysis of the different farms shows that farmers are of all ages, they have insufficient equipment, relatively low operating means and limited access to credit.