Lakes in cold regions are an important source of methane emissions, and their emissions are anticipated to increase with climate change. Small lakes are abundant in regions such as Alaska's Yukon Kuskokwim Delta, and emit considerably more methane per unit area than larger lakes. The total emissions from these small lakes are uncertain because their size makes them difficult to map with many commonly used satellite imagery sources. Additionally, lake areas are anticipated to change in northern regions as the frozen soil (permafrost) thaws under a warming climate. We combined detailed maps that capture small and large lakes, maps of lake area change due to permafrost thaw, and numerical model simulations to better estimate total emissions from lakes in the Yukon-Kuskokwim Delta, Alaska. These updated estimates show the effects of lake area change within individual seasons and multidecadal time periods on lake methane emissions.