The victims of both robberies were slowly recovering from their ordeal and still receiving support, Detective Inspector Kevin Burke said.
"This matter was able to be resolved quickly due to good information received from the community, who were appalled by this man's actions. Good, urgent police work has prevented further harm," he said.
The vehicle stolen from Three Mile Bush Rd had been recovered in Haruru Falls.
Police were still looking for the firearm used at the Homestead Tavern.
Enquiries were continuing to identify the co-offender for the tavern robbery.
Anyone with further information is asked to contact the Whangarei Police on 09 430 4500 or Crimestoppers anonymously on 0800 555 111.