Jefferson Street Grounds (1864–1876)
Jefferson_Street_Grounds_1864-1876
Jefferson Street Grounds in Philadelphia hosted leading amateur and professional clubs during baseball’s formative years, most notably the Philadelphia Athletics, who played there while competing in the National Association. The enclosed park included covered seating and attracted large crowds for important intercity matchups, helping cement Philadelphia as a baseball stronghold.
One notable feature of Jefferson Street Grounds was its shifting diamond configuration over time. Home plate was relocated more than once within the same enclosure, altering field dimensions and sightlines as the club experimented with layout and crowd accommodation. These adjustments reflected the evolving standards of professional baseball and the practical realities of fitting a regulation field into an urban setting.