In accordance with government directives, the Palace of Versailles, the Grand and the Petit Trianon are closed. 
Visitors who have purchased a ticket for this time will be reimbursed. 

From November 2nd, in accordance with measures set out by the French Ministry of Culture for the opening of heritage parks, the park of Versailles, the lake of the Swiss Guard and the Estate of Marly will be open to walking from 8 a.m. to 6 p.m. Cars are not allowed. 
Only pedestrians and cyclists will be admitted in the Park provided their compliance with government circulation rules. Access to the Park will be possible only by the Queen's gate and the Saint Anthony gate
Conditions to access the estate of Versailles