The chateau is open Tuesday-Sunday 9am-6:30pm (winter 5:30pm); the Grand and Petit Trianon Tuesday-Sunday 10am-6:30pm (Tuesday-Friday 10am-12:30pm and 2-5:30pm, Saturday and Sunday 10am-5:30pm in winter); the gardens Tuesday-Sunday 7am to sunset.
On Friday at midday, the chateau is open.