Geosynthetics are increasingly utilized in unpaved roads to enhance pavement performance and extend the design life of flexible pavement. The California Bearing Ratio (CBR) value is an important parameter of subgrade material for designing a flexible pavement. This study experimentally investigates the impact of incorporating a single layer of geogrid reinforcement on the CBR of locally available subgrade material. Within the CBR mold, the placement depth of the geogrid varies at H/2, H/3, and 2H/3, with H representing the height of the mold. The geogrid is uniformly tensioned at the periphery in each arrangement. A series of CBR tests is conducted on the locally available soil under soaked conditions to comprehensively analyze the influence of geogrid on CBR values. The experimentally obtained results are then used to estimate the corresponding pavement thicknesses according to IRC SP-72-2015. The results indicate that the incorporation of geogrid reinforcement leads to a notable increment in CBR value and decrement in pavement thickness. The optimal placement of the geogrid at H/3 yielded the most substantial benefits. This configuration resulted in about a 61% enhancement in the CBR and a 12% decrease in the required pavement thickness. This study contributes toward a deeper understanding of geogrid reinforcement application in unpaved roads, offering insights into thickness reduction and performance optimization.