Silty soils are one of the major types of soils which are prevalent all across the world. These silty soils possess low bearing capacity and shear strength properties making them unsuitable under heavy loading conditions. However, these soils can be stabilized to enhance the engineering and load-bearing characteristics. In view of this, quartz powder has been employed in the present study to stabilize silty soils. Quartz powder is generally considered to be chemically inert and blending of quartz powder with silty soils enhances the overall density of the mixture, as quartz powder acts as a filler material and fills up the voids present among soil grains. Various percentages of quartz powder ranging from 5–25% are replaced with silty soils and the variations of index and engineering properties are studied. A linearly increasing CBR values are noted with the increase of quartz powder content up to 15% and a decreasing trend is noticed afterward. Thus, based on the CBR results, an optimum quartz powder content of 15% is considered and evaluated for UCS, UU triaxial tests to understand the effect of quartz powder on shear strength properties of silty soils. The results show that the CBR increased from 10.8 to 26.12% for unsoaked and 4.50 to 16.66% for soaked conditions with 15% quartz powder. According to the IRC: 37-2018, the California Bearing Ratio (CBR) is used to assess the suitability of subgrade soils and to determine the need for stabilization. CBR data is used to determine the need for soil subgrade stabilization and the required as per IRC guidelines overall pavement thickness is equal to the subgrade. An increase in shear strength properties is obtained in comparison to unstabilized soil. Overall, the stabilization of silty soils with quartz powder has enhanced the mechanical behavior of silty soils and proves to be a sustainable method to stabilize silty soils.