School districts across Oregon will have to provide a full-day of kindergarten -- starting four years from now.

Gov. John Kitzhaber signed the full-day kindergarten bill into law Wednesday.

Oregon currently funds a half-day of kindergarten, though some districts spend federal funds or charge tuition money to provide the full day. Democratic state senator Mark Hass was among the bill's biggest proponents. He says the state will not just require -- but will pay for full-day kindergarten -- by 2015.

"Yes, this will give us time to ramp up for this extra money. This ultimately saves money – that is what schools have discovered. These kids aren't going into intervention programs, there's less remedial education, and ultimately it'll have an effect on the dropout rate," Hass said.

Hass says the legislature passed other education bills this year that he expects to save money. He says those savings could free up money for kindergarten, by the time 2015 rolls around.