Yorkshire Day is being celebrated by people throughout the region.
The white rose has particular significance on 1 August
This year, Bradford has been chosen to host the main proceedings with up to 200 civic leaders parading through the city before a service at the cathedral.
Other events include the Beating of the Retreat ceremony and readings of the traditional Declaration of Integrity in towns and cities across the region.
Yorkshire Day was started in 1975 to restore pride in a county undermined by the loss of its traditional industries.
It falls on 1 August to mark the date in 1759 when soldiers from Yorkshire regiments placed white roses alongside fallen comrades on the battlefield of Minden in Germany.
During the celebrations, the Yorkshire air ambulance will fly into Odsal stadium as part of its official thank you tour of the region.
It will be met by Bradford's Lord Mayor Valerie Binney and six civic dignitaries from across the county whose towns and cities have supported the charity.