This study presents the most comprehensive and consistent reconstruction of wildfire history in the Sierras de Córdoba, Argentina, spanning the period 1986–2024. By integrating multiple satellite data sources (Landsat, Sentinel-2) and applying hybrid classification techniques in Google Earth Engine, a spatially explicit burned area dataset was developed. A total of 11,568 wildfire events were recorded,over the 39-year period studied, accumulating more than 2.6 million hectares (ha). While 83% of the fires were smaller than 100 ha, large fires (>1,000 ha) accounted for nearly 75% of the total burned area. Among these, megafires—defined as events exceeding 10,000 ha—represented only 0.35% of all fires but were responsible for over 43% of the total area burned. Fire activity showed strong seasonality: over 60% of the total burned area occurred between August and October, with September and October being the most critical months. This long-term dataset provides a critical tool for understanding fire regime dynamics, supporting land management, and assessing the ecological and socio-economic impacts of wildfires in the context of climate change and expanding Wildland-Urban interface.