The plunge, which starts at 10 a.m., raises money for the Human Resources of the Hamptons' food pantry, which feeds 350 local families.
Plungers have raise or give a minimum of $25.
Registration takes place at the Pavilion at Coopers Beach before 9:30 a.m.
In 2013, 411 plungers helped raise $77,000 to purchase food, emergency fuel and utilities, school supplies, medical transportation, home repairs, and more.
The goal this year is $100,000.
Are you taking the plunge?