The biggest push for vaccinations landed last month in the middle of the busiest time of year on farms, with calving, lambing, and mating.
DairyNZ said half of dairy farms were short-staffed, and it was critical farm teams stayed healthy to help protect the wider community, by being vaccinated.
A Ministry of Health spokesman said the ministry was acutely aware of the need to reach outlying rural communities.
"Vaccination is by far and away the best way to keep ourselves and our communities safe. Two doses of the vaccine are very effective at protecting against Delta symptoms, and especially against severe illness requiring hospitalisation."
District Health Boards are using pop-up and mobile clinics to get to remote areas.
The health ministry says Canterbury, South Canterbury, Taranaki, Southern, MidCentral and Northland health boards have been working to reach rural communities for a while.
Whanganui, Lakes, Hawke's Bay, Wairarapa, West Coast and Nelson/Marlborough health boards are making "significant efforts" to push vaccination services into harder to reach rural areas.
Assoc Prof Nixon said the improving coverage for Māori was still much lower than where experts would like it to be.
Urban Māori were 63 per cent double-vaccinated compared with 58 per cent for Māori in rural areas.