Granular roadways in northern plains are routinely subjected to seasonal freeze-thaw (F-T) cycles, resulting in extensive damage from frost-related problems such as frost heave, frost boils, thaw settlement, thaw weakening, rutting, and potholes. As a new method, the current project funded by Iowa Highway Research Board (IHRB) studied to make subgrade soils water repellent via the use of nanoscale organo-silane (OS) products as additives to mitigate the damage that occurs due to F-T cycles. The presentation will present and explain the evaluation of the use of OS to control water and increase subgrade and overall granular roadway performance.