Four ambulances responded but none of the students suffered more than scratches and bruises.
Kawakawa fire chief Wayne Martin said the impact was enough to tear the side door from the van. Firefighters spent more than two hours at the scene directing traffic and helping remove the van from the ditch.
It was one of two vans taking musicians from the east Auckland school to this weekend's Bay of Islands Jazz and Blues Festival.
Once alternative transport had been arranged for them, Mr Martin said the teachers' plan was to get the students to their accommodation, feed them, and get them playing some music to hopefully take their minds off the crash.
The students were scheduled to play in Russell today from noon outside the Trader's Mall, at 2pm in the Duke of Marlborough Hotel, and at 7pm at the Duke of Marlborough Tavern.
The crash was being investigated.