You can see the March Madness schedule from the NCAA's own site at NCAA.com or by visiting the media partners online at CBSSportsline.com or ESPN.com. The dates and venues for the various tournament rounds are shown up to three years in advance, but actual game times are not available until the weekend before the tournament.
March Madness, the nickname given to the NCAA Men's College Basketball Tournament, is now a large-enough event that the arenas hosting regional and final rounds of the tournament are chosen up to three years in advance. At the time these venues are revealed, the NCAA also traditionally releases the schedule for the respective tournament rounds as well. The dates and venues are available online almost as soon as they are officially announced.
You have to wait until the Sunday before the start of the tournament for any given year to get the actual brackets with each game pairing listed. On that day, now known as Selection Sunday, the Tournament Committee reveals all brackets including teams, tournament seedings and game start times for the upcoming March Madness tourney. Complete brackets, including printable versions suitable for office pools, are available from the NCAA's media partners online. Most major sports media outlets including online news sites also typically publish the brackets.