 The study investigates the relationship between the dry season onset end and fire occurrence in the Amazon basin using monthly time series of active fires from 2003 to 2019. It found that more than 50% of annual mean active fires occurred in the peak month, which was August-September for 52% of cells and October-March for 48%. Fire peaks occurred in the last two months of the dry season in 67% of cells and in 20% in the first month of the rainy season. The study defines a critical fire period by identifying consecutive months that concentrated at least 80% of active fires in the year, which varied between two to three months in different regions of the Amazon basin. The findings provide recommendations for monitoring fire dynamics to support decision makers in management policies and measures to avoid environmentally or socially harmful fires. This article was authored by Nefalia S. Carvalho, Liana O. Anderson, Casio A. Nunes, and others. We are article.tv, links in the description below.