Principal Liz Ross said the school vans were old - each had clocked up 15 years' use - but essential.
"The big kick is that we have school camps coming. That's when we'll really need them. It's an added blow at this time of year."
Teachers were now trying to arrange alternative transport. Borrowing parents' vehicles wasn't an option because few Kawakawa people had a vehicle they could spare for several days for a school camp.
The remaining van was now stored at board member's home. Ms Ross said one van was not enough for a "sports-proud" school of 205 children who travelled weekly to Kaikohe for touch tournaments or, in summer, to Kerikeri for netball.
Full insurance for such old vans was not economic so they had third-party cover only. The school would try to find money for replacements but it would be difficult, especially after a recent funding cut following the school's surprise elevation from decile 1 to 2.
Staff had tried to keep the thefts from the pupils but parents were "up in arms".
"The second van, that was the last kick in the guts. They've had enough. In the end it's the children that will suffer."
Ms Ross urged anyone with information about the thefts to call the school or, better still, the police. She also asked locals to help keep an eye on school, especially during weekends.
The first theft coincided with a spate of vandalism at Kawakawa Primary. At least seven windows were broken, wall panels were kicked in, and a drum kit and two electric guitars were taken from the hall.
Sergeant Kevin Milne, of Kawakawa police, said the investigation into the thefts was ongoing. He urged anyone with information to call the Kawakawa station on (09) 404 3150.