The Tetley's South Stand includes 2,200 seats and a standing capacity of 5,500, replacing the old 1930's terrace.
The work forms part of Caddick Construction's £45 million project to transform the rugby venue.
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The entire project is expected to be completed in summer 2019.
Leeds Rhinos took on local Super League rivals Wakefield Trinity in the annual Wetherby Whaler Festive Challenge on Boxing Day, which marked the official opening of the new stand.
Leeds Rugby League Hall of Fame members Keith McLellan and Garry Schofield OBE joined a host of other sporting household names at the event.
(CM/MH)
