I just wanted to remind everyone that the official Ice-Out occurs only when the Mount can navigate between its ports. The lake can be almost entirely free of ice without Ice-Out being declared. This happened in 2001 when a stubborn flow of ice blocked the Mount from reaching Wolfeboro even though the rest of the lake was free of ice. Ice-Out in 2001 wasn't declared until May 2nd.
Ice-Out dates since 2000:
2000: 4/10
2001: 5/2
2002: 4/5
2003: 4/25
2004: 4/20
2005: 4/20
2006: 4/3
2007: 4/23
2008: ?
Ice-Out dates for the last 120 years are
here.