Taranaki Regional Council is urging people to check before travelling by bus services.
With Omicron spreading through the community short notice cancellations are expected on CityLink, Connector, SouthLink and school bus services.
Taranaki Regional Council's transport engagement manager, Sarah Hiestand, says it is likely that the region's public transport services will move to a reduced timetable in coming weeks as drivers and staff become unwell or are required to self-isolate.
"Maintaining accessibility around the region, while keeping communities safe is a top priority for the regional council. To minimise the impact of a reduced timetable as much as possible, we will prioritise services used by school children and frequencies will be reduced outside of peak times."
She says the regional council is doing its best to maintain community access to essential bus services.