Pierre Samuel du Pont de Nemours, sons Victor Marie and Eleuthère Irénée, and their families arrive in America.

The Du Pont family settles in the Brandywine Valley. E. I. du Pont establishes gunpowder manufactory, E. I. du Pont de Nemours & Co.

E. I. Du Pont purchases four tracts of land forming the nucleus of what later becomes Winterthur.

E.I. du Pont dies and leaves the property to his children.

Jacques Antoine Bidermann and his wife, Evelina Gabrielle, a daughter of E. I. du Pont, purchase the property from the other siblings and begin construction on a twelve-room Greek revival mansion. They name it Winterthur after Bidermann's ancestral home in Switzerland.

Jacques Antoine and Evelina du Pont Bidermann move into the house at Winterthur.

Evelina du Pont Bidermann dies.

Jacques Antoine Bidermann dies.

General Henry du Pont (brother of Evelina) purchases Winterthur from his nephew James Irénée Bidermann (son of Jacques and Evelina), for his own son Colonel Henry Algernon du Pont.

Col. Henry Algernon and Pauline Foster du Pont, who married in 1874, settle at Winterthur.

Henry Francis du Pont is born to Col. Henry Algernon and Pauline Foster du Pont.

Gen. Henry du Pont dies; Col. Henry Algernon inherits Winterthur.

H. F. du Pont enters Harvard.

Col. Henry Algernon du Pont adds a new façade and library wing to the existing building at Winterthur. Pauline Foster du Pont dies.

H. F. du Pont graduates from Harvard and begins to manage the Winterthur household for his father.

H. F. du Pont takes over supervision of the gardens and grounds.

H. F. du Pont becomes manager of Winterthur Farms.

H. F. du Pont marries Ruth Wales.

Col. Henry Algernon du Pont dies; H. F. du Pont inherits Winterthur.

A new wing is constructed, doubling the size of the existing building.

H. F. du Pont establishes the Winterthur Corporation, a nonprofit, educational foundation, with the intent of opening his home as a museum.

Winterthur opens to the public on October 30.

Winterthur Program in Early American Culture is established. First garden tour is given.

Winterthur fire department is established..

The Pavilion opens as the visitor reception area.

Copeland Lecture Hall opens.

Ruth Wales du Pont dies.

H. F. du Pont dies. The Louise du Pont Crowninshield Research Building, named for his sister, opens.

Winterthur/Univ. of Delaware Art Conservation program is established.

The Winterthur Guild is established.

First Christmas tour; officially called Yuletide at Winterthur in 1979.

The Galleries at Winterthur open.

The Henry S. McNeil Gallery opens.

The Thomas A. Graves, Jr., Gallery for changing exhibitions opens.

The Campbell Collection of Soup Tureens at Winterthur opens in the new Dorrance Gallery. (The collection was donated to Winterthur in 1996.)

Director Leslie Greene Bowman introduces new vision: Winterthur: An American Country Estate.

Winterthur's 50th Anniversary; Enchanted Woods opens.