The 1858 Atlantic hurricane season was one of only three Atlantic hurricane seasons on record in which every tropical cyclone intensified into a hurricane (the others were in 1852 and 1884). The first hurricane was first observed over the northwestern Caribbean Sea on June 12. The sixth and final storm was last noted on October 26. These dates fall within the period with the most tropical cyclone activity in the Atlantic. Three tropical cyclones during the season existed simultaneously. Two of the cyclones have only a single known point in its track due to a sparsity of data. Operationally, another tropical cyclone was believed to have existed over the eastern Atlantic between September 17 and September 18, but HURDAT – the official Atlantic hurricane database – excludes this system. Howev