The Duke and Duchess of Cambridge will receive a traditional Calgary welcome when they are presented with "10 gallon" hats.
William and Kate will be 'white-hatted' when they fly into the city's airport after taking a 24-hour break from their tour of Canada.
The metropolis is home to the Calgary Stampede, the world famous annual rodeo and festival which is billed as the greatest show on earth.
Ahead of the launch of the popular event - which the couple will start on Friday - William and Kate will join Canada's prime minister Stephen Harper at the stampede exhibition centre for a reception during the afternoon.
Outside the building William will throw a stove into a "chuck wagon", the traditional way to start one of the stampede's races.
Calgary is a gleaming modern metropolis of more than a million people that remains in touch with its roots as a Wild West frontier town.
Nicknamed Cowtown, its wealth is now built on oil and gas rather than cattle, but every year in July locals and visitors act out their cowboy and cowgirl fantasies at the 10-day stampede festival.
Calgary, in Alberta province on the edge of the Canadian Rockies, is also a popular destination for winter sports and hosted the 1988 Winter Olympics.
During the day the royal couple will also visit a teaching hospital run under the auspices of the University of Alberta, where they will meet and get to treat "Stan", a cutting-edge learning tool for doctors and nurses.