According to the United States Census Bureau, the township has a total area of 27.9 square miles (72.3 km2), all of it land.

Broad Mountain, reaching an elevation of 1,804 feet (550 m) above sea level, occupies the southern half of the township, while Spring Mountain is along the northern border and has a high point of 1,913 feet (583 m).

Between the two mountains is the valley of Quakake Creek, the settled part of the township, with elevations from 1,050 to 1,300 feet (320 to 400 m).

Packer has a warm-summer humid continental climate (Dfb) and the hardiness zones are 5b and 6a.

[7] Pennsylvania Route 93 is the only numbered highway passing through Packer Township.

It follows a northwest-southeast alignment through the northeastern portion of the township, crossing Quakake Creek in Hudsondale and leading northwest across Spring Mountain 7 miles (11 km) to Hazleton and southeast across Broad Mountain 8 miles (13 km) to Jim Thorpe, the Carbon County seat.