School board chairman Jody Usry says the four-day school weeks will last for as long as necessary.
Teachers will come to work on Mondays, but classes will not be held to save about $400,000 on utilities and transportation costs.
The move comes after Gov. Sonny Perdue announced that the state's 128,000 teachers are to take three unpaid furlough days, and that public school systems must slash their budgets by 3 percent.
Usry says Peach County employees will still take furlough days off, likely on three Mondays.