Her Majesty will be joined by the Duke of Edinburgh for the walkabout from Windsor Castle to the Guildhall in the High Street to celebrate her diamond jubilee.
People hoping to catch a glimpse are being warned to arrive early to make sure they get a view as large numbers are expected to turn out.
Roads in central Windsor will be closed from 10am to 1.30pm including the entire lengths of High Street, Castle Hill, St Albans Street, and Park Street.
Thames Street will be closed between the B470 Datchet and Peascod Street junctions, River Street between the Thames Street and Thames Avenue junctions and Sheet Street between the Victoria Street and High Street junctions.
On-street parking in High Street, Thames Street, St Albans Street, Park Street and Sheet Street will be suspended between 10am and 1.30pm and parked vehicles could be removed.
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