What is the ABV of Mangrove Jack’s Hard Seltzer? Tori November 01, 2020 19:00 Updated Approximately 4.0% ABV. Related articles How should Mangrove Jack’s Hard Seltzer be drank/served? How much Hard Seltzer does the Mangrove Jack’s Recipe Kit make? Is Hard Seltzer right for me? What is Hard Seltzer? What flavours does Mangrove Jack’s Hard Seltzer come in?