Motorsport will lose the use of iconic Pukekohe Park Raceway, with Auckland Thoroughbred Racing announcing plans to expand its operation at the venue from next year.
The last motorsport event has been scheduled for April 2, 2023, as horseracing takes centrestage.
But Supercars have confirmed their commitment to continuing in New Zealand, despite the loss of its primary venue over the past 20 years.
"It's obviously a great loss to farewell a circuit with so much history and heritage to both New Zealand and Australian racing," said Supercars chief executive Shane Howard.
"Legends were created here and it was the location of Supercars' first ever international Championship race. Its legacy will live on for many years to come."
The Australian championship will return to Pukekohe in September, after COVID-19 prevented racing on this side of the Tasman for the past two years, although the 2020 round was scheduled for Hampton Downs.
"We have other great venue options available and will now begin discussions regarding our 2023 calendar," said Howard.
"It's our absolute intent to continue racing in New Zealand and we are now exploring alternative venues for the New Zealand event for the future."
Auckland Thoroughbred Racing has used the circuit during resurfacing at Ellerslie Racecourse and identified a need for more training facilities in the region.
"As a result, we are developing plans to build additional stabling facilities at the racecourse to accommodate an increased horse population," said ATR chief executive Paul Wilcox.
"Unfortunately, however, it is not conducive to have both motorsport activities and an increased number of horses stabled on site, hence our decision not to renew Pukekohe Motorsport's lease with us."
Pukekohe Motorsport managing director Gary Stirling describes the loss as a "game changer" for the sport in New Zealand.
"Although I am unhappy to be losing use of the park, I understand ATR's future plans and respect their decision for them to grow their business," he said. "Hearing their plans, it was clear to see that motorsport just could not function at the park in conjunction with the club's future plans.
"The next nine months will be busy for us and I am sure we can all add to the history prior to the last chequered flag."
Beyond the Supercars Supersprint, the venue will host the traditional Melbourne Cup horseracing event, transferred from Ellerslie on November 1.
