The Magpies lost the shield to Counties-Manukau in a 27-24 thriller last year, just six days after a one-point trophy-winning victory over Otago in Dunedin. But they redeemed themselves this season and won it back from the Steelers at Pukekohe on August 30.
Before last year's triumph, the province last won the shield on September 24, 1966, and held it for 21 defences until September 27, 1969 - a feat the Hawke's Bay Rugby Union strives to reproduce.
MetService forecasts the weather for Sunday's match will be showers, with a developing southwesterly and a high of 17C.
The curtain-raiser for the big game will see the region's future stars play for the Hawke's Bay U16 team as they take on Poverty Bay U16.
Hawke's Bay's other ITM Cup matches at McLean Park - all shield defences if the Magpies retain the coveted trophy - are against Bay of Plenty on Saturday, September 20, at 2.35pm; Wellington on Wednesday, October 1, at 7.35pm; and Southland on October 11, at 5.35pm.