What is the official end date of the Atlantic hurricane season?

The official end date of the Atlantic hurricane season is November 30. The season officially runs from June 1 through November 30 and covers the North Atlantic Ocean, Caribbean Sea, and Gulf of Mexico.

These dates are a planning framework, not a natural boundary. Tropical systems can form before June 1 or after November 30 when ocean temperatures, atmospheric moisture, and wind patterns are favorable. For example, named storms have developed in May and December, outside the official season.

The season’s activity usually peaks around September 10, with most storms forming between mid-August and mid-October. November is generally quieter because cooler waters and stronger upper-level winds make tropical development more difficult, but late-season storms remain possible.

The November 30 date also prevents a common mix-up: the season does not end on December 1. November 30 is the final official day, while December 1 marks the first day outside the defined season. Forecast centers can still monitor and name storms that develop beyond the calendar window.