Timeline of the 1974 Atlantic hurricane season

The 1974 Atlantic hurricane season was a cycle of the annual tropical cyclone season in the Atlantic Ocean in the Northern Hemisphere. There was near-average activity during the season, which officially began on June 1, 1974 and ended on November 30, 1974. These dates, adopted by convention, historically describe the period in each year when most tropical systems form. The first system of the season, Tropical Depression One, formed on June 22. The final system of the season, Tropical Depression Seventeen, dissipated on November 11.

The 1974 season produced twenty tropical or subtropical depressions, of which eleven reached tropical (7) or subtropical (4) storm intensity. Four of the tropical storms became hurricanes, of which two became major hurricanes. At Category 4 on the Saffir–Simpson scale, Hurricane Carmen was the most intense tropical cyclone of the season, with sustained winds of 150 mph (240 km/h) and an atmospheric pressure of 928 mbar (27.40 inHg). It made landfall in the Yucatán Peninsula and then in Louisiana. This season, one system, Hurricane Fifi, crossed into the Pacific Ocean, where it was remamed Orlene.

This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season. It includes information that was not released throughout the season, meaning that data from post-storm reviews by the National Hurricane Center, such as a storm that was not initially warned upon, has been included.

The time stamp for each event is first stated using Coordinated Universal Time (UTC), the 24-hour clock where 00:00 = midnight UTC. The NHC uses both UTC and the time zone where the center of the tropical cyclone is currently located. The time zones utilized (east to west) prior to 2020 were: Atlantic, Eastern, and Central. In this timeline, the respective area time is included in parentheses. Additionally, figures for maximum sustained winds and position estimates are rounded to the nearest 5 units (miles, or kilometers), following National Hurricane Center practice. Direct wind observations are rounded to the nearest whole number. Atmospheric pressures are listed to the nearest millibar and nearest hundredth of an inch of mercury.