1. MSP Polar Bear Plunge in Maryland (known as Plungeapalooza)
This year the event is celebrating its 20th anniversary on Jan. 30, 2016. The money raised will go for the support of 7,169 athletes with intellectual disabilities around Maryland. This is the biggest fundraiser of the year for the Maryland Special Olympics. The icy water plunge has become among the most popular in the country, turning it into a must-do winter event for many adrenaline-seekers.