Auditor-General Lyn Provost says district health boards have to tackle transport and affordability barriers to after-hours services.
Her office has conducted an audit of whether health boards meet the Government's expectation that after-hours services should be available for 95% of the population within an hour's travel time.
Ms Provost says all boards met the expectation despite the challenge of providing health services to a small population with a widely dispersed rural community.
The audit found that 99.7% of New Zealanders have services available within a 60-minute drive.
But Ms Provost says after-hours services must be accessible and affordable.