Among the many challenges the Arctic region faces as shifting climate conditions threaten the frozen landscape, the collapse of its terrestrial transportation infrastructure is one of the most prominent. This research builds upon the Community Arctic Transportation Accessibility Model (CATAM) to find key areas of vulnerability for permanent roads and railroads as well as seasonal winter and ice roads. The latest version of CATAM uses CMIP6 data from NCAR’s Community Earth System Model (CESM) under moderate (SSP245) and extreme (SSP585) projected climate scenarios to create a comprehensive analysis of future terrestrial hazards. Changes in transportation and the accessibility of infrastructure networks are simulated across the Arctic states – the US (Alaska), Canada, Denmark (Greenland), Iceland, Norway, Sweden, Finland, and Russia. Preliminary results indicate a widespread decline in overland accessibility by mid-century, with Finland, western Russia, Nunavut and the Northwest Territories in Canada, and the North Slope Borough in Alaska particularly affected. The results of this research can help to inform policymakers and infrastructure planners in order to support sustainable transportation strategies and infrastructure development in the Arctic regions.