The Marie-Antoinette's Estate and the Grand Trianon are open every day, except on some French public holidays and during official ceremonies.,
Admissions :
1 November - 31 March
12 noon to 5.30pm (last admission: 5pm)
Petit Trianon Gardens open for walks all day.
1 April - 31 October
12 noon to 6.30pm (last admission: 6pm)
tickets sold until 5.45pm