The Parade starts at 44th Street at 11:00 am and is held every March 17th, except when March 17th falls on a Sunday, it is celebrated the day before, Saturday the 16th due to religious observances.
The parade marches up Fifth Avenue past St. Patrick's Cathedral at 50th Street to 79th Street, where the parade finishes at around 4:30 - 5:00 pm.
Line of March (.pdf)
GETTING TO THE PARADE
Leave your car at home and take the subway or train (MTA) to the Parade
BEST VIEWING SPOTS
To avoid the crowds that pack the sidewalks below 59th Street, go anywhere North of 66th Street and Fifth Avenue.
The upper steps of the Metropolitan Museum of Art provide a great view. You can get a close-up view of the marchers at 86th Street where the Parade route ends and the marchers disband and embark to go home or to celebrate.