Integrating geo-natural fibers in subbase and subgrade construction emerges as an innovative and ecoconscious approach to enhancing road and pavement infrastructure's mechanical properties and longevity. Investigating the incorporation of various geo-natural fibers, including jute, coconut, and sabai grass, into these layers, this research explores their potential as environmentally friendly alternatives to conventional building materials. Examining the impact of these fibers on the engineering properties of subbase and subgrade layers, such as tensile strength, load-bearing capacity, and resistance to soil erosion, the study reveals notable enhancements in soil stabilization, settlement reduction, and resilience to moisture-induced damage with the use of geo-natural fibers. By emphasizing sustainable construction practices, the study advocates for the adoption of bio-based materials to mitigate the environmental footprint of infrastructure development. The findings underscore the significance of low-cost, ecologically friendly road construction technologies, particularly in regions abundant in natural fibers, thereby promoting a more environmentally conscious approach to infrastructure development.