Nearly a third of the deaths on the road in 2018 have involved motorcycles, leading police and ACC to urge riders to take care on the roads.
The road toll hit 34 on Wednesday, three more than at the same time in 2017.
Eight have been motorcycle riders and two pillion passengers.
This represents a terrible start to the year, says Assistant Commissioner for road policing Sandra Venables.
"To reduce these crashes we need all motorists to make safe decisions on our roads," she said.
"Riders are incredibly vulnerable users of our roads given the much greater impact and trauma they face in a crash.
"I urge motorcyclists to be cautious and not take unnecessary risks."
Assistant Commissioner Venables said half of the motorcycle deaths were due to unsafe overtaking.
ACC's Mike Tully says huge numbers of motorcycle riders are enjoying the summer weather but people still need to ride within their capability, at a pace that feels comfortable, and wear good quality safety gear.
"Motorcycle riding is acknowledged as high risk, but getting training to handle the environment and conditions in which you ride can reduce that risk, and avoid the physical, emotional and financial cost that results from serious crash injuries," he said.