The 1851 Atlantic hurricane season was the first Atlantic hurricane season to be included in the official Atlantic tropical cyclone record. Six known tropical cyclones occurred during the season, three of which intensified into a hurricane, while one of those became a major hurricane. The earliest known storm formed by June 25 and the latest of which dissipated by October 19. Another storm was believed to have existed on September 18, but has since been removed from the official hurricane database (HURDAT). These dates fall within the range of most Atlantic tropical cyclone activity. None of the cyclones existed simultaneously with another, while three of the storms only have a single point in their track known. 6 storms, 3 hurricanes, 1 major hurricanes (Category 3+). Strongest: an unnamed storm (115 mph). Accumulated cyclone energy ≈ 36. Wiki link