Root system architecture is critical for plant growth and crop yield, especially under abiotic stress conditions such as drought, salinity, and flooding. In this study, we evaluated the salt tolerance of thirteen rice genotypes by analyzing plant height, root length, root growth angle, and soil-surface rooting using the glass tube method with NaCl supplementation at concentrations of 0‰, 3‰, and 6‰. The results indicated that salinity negatively impacts the plant height, reducing it by 4.5% to 31.8%, and restricts root development, with root length reductions of 0.8 to 3.8 cm at 6‰ NaCl. Notably, rice genotypes 8C, Hom rau 6190, Cuom type 2, Lua ven, and Chanh trui exhibited strong salt tolerance at 3‰ NaCl concentration, as evidenced by a high soil-surface rooting ratio and a root growth angle below 30 degrees (salt tolerance scores of 1). These findings have provided valuable information for assessing salt tolerance in rice genotypes based on their root system architectures.