The Prior Lake Polar Plunge is part of the state-wide plunge which was started by law enforcement as a way to raise money for the Special Olympics Minnesota.  It is held in February, and the Prior Lake one takes place in at Sand Point Beach. Several thousand people jump in icy waters in the middle of winter, and it's all for a good cause. The Prior Lake Polar Plunge started in 2009, and it's being going strong ever since.