Baseball’s “foul poles” have a misleading name: the poles themselves are in fair territory. So are the chalk lines that run from home plate toward them. That distinction matters most when a high fly ball curls toward an outfield corner. If it strikes a foul pole while still in the air, it’s a home run—not a foul ball.
Why does hitting the pole count?
Think of each pole as the upward continuation of a foul line. The line marks the edge of fair territory, but it belongs to fair territory too. A fly ball that clips the pole has therefore touched a fair part of the field. The ball is a home run even if it ricochets back toward the foul side afterward. MLB’s guide to fair balls spells out the rule.
Now picture a fly ball that misses the left-field pole on its outside edge and sails into the seats. That one is foul. From behind home plate, a ball must pass to the right of the left-field pole—or to the left of the right-field pole—to leave the park in fair territory. A near miss can make all the difference.
Does every fair ball near the pole become a homer?
No. The ball must clear the outfield fence on the fly, or strike the pole while in flight, for this particular home-run rule to apply. A fair ball that lands on the field near the line is still in play; its landing spot and path determine what happens next.
It’s one of baseball’s neat little contradictions: the structure called a foul pole can turn a barely fair swing into a home run. For another rules-related curiosity, read about the different ways a batter can reach first base.