More than 100 military vehicles, classic cars and tractors will follow the route around the coast.
The cavalcade begins at Torteval Church before following Guernsey's coast in a clockwise direction.
More vehicles, gathered at Pembroke, will join for the final leg of the route, through the Bridge and ending up on the seafront in St Peter Port.
Director of the Liberation Day Cavalcade Jeff Vidamour says the event is a staple in Guernsey's Liberation Day calendar.
"We know the cavalcade is one of the most popular parts of the day's celebrations. It is a wonderful event to be part of, and the vehicle owner's enjoy it as much as the people who line the route, waving their flags and cheering us past."
From 3pm to 5pm, islanders can get a closer look at the vehicles and speak with their owners at the static display on the seafront.
User pays when Guernsey roads have to close
Channel Islander abandons Bordeaux as the flames 'arrive at the city's gates'
Annual Guernsey Scarecrow Festival set to raise thousands for charity
Channel Islands face 'physical' Poland test
Baby born on Guernsey's Marine Ambulance
New interim leader for Guernsey's healthcare system
Guernsey's reservoir levels falling after prolonged dry spell
Guernsey's Commonwealth flag carrier in early Games win
