Wildfires are becoming more frequent and increasing in intensity, which results in significant threats to human life and property. Road networks play an important role in emergency activities. It is reasonable that robust road connectivity will give evacuees and emergency services the ability to respond more effectively, which may lead to a reduction in casualties. This study ex-plores a novel graph-based connectivity index for road networks that considers different analysis scales to measure the impact on global wildfire fatality events in past decades. We find a sig-nificant and systematic relationship between fatalities and a calibrated connectivity index across different wildfire events. This parsimonious and simple graph theoretic measure can provide planners a useful metric to reduce vulnerability and increase resilience among areas that are prone to wildfires.