The queen has attended Trooping the Color every year of her reign except for one -- 1955 , when a national rail strike canceled the event , the palace says . Queen 's April birthday is celebrated in June to enjoy good weather . Comment: Troop inspection , flyover by Royal Air Force , part of ceremonies .
Queen 's April birthday is celebrated in June to enjoy good weather . Comment: Troop inspection , flyover by Royal Air Force , part of ceremonies .