This depends on the sport, league, and season.
The 2011 NHL playoffs began on April 13.
The 2010 playoffs will begin within a couple of days after the regular season ends on October 3.
2010 April 14th
No, NBA teams cannot sign free agents during the playoffs. The league has a moratorium on signing new players once the playoffs begin.
April 18th (west) and April 19th (east)
Usually around Aprilish(April)
Which season? I cannot give an answer unless you specify a specific year.
The NFL playoffs begin in early January and may end sometime in late January or early February. This is around the same time anticipation for the SuperBowl begins. The playoffs never start earlier than this for the regular season would still be in progress.
Saturday, April 16, 2011The 2010-2011 NBA Playoffs begin on Saturday, April 16, 2011. (See the Related link for more information.)
The NCAA college football playoffs will not start until January 1st, 2014. There are several college bowls and there has to be teams narrowed down to play in each bowl tournament.
Yes: The NHL Stanley Cup Playoffs begin in April and end in early June.
no