Shortly into spring training, the Colorado Rockies announced that they would raise Coors Field’s outfield fences. Well, some of them, anyway: From right-center field to straightaway right field, the height of the wall is nearly doubling, to 16 ½ feet; down the left-field line, it is going to 13 feet from 8 feet.

So what took them so long?

Before the Rockies installed a humidor in 2002 — the humidor keeps the baseballs relatively moist, counteracting the dry air in Denver that would otherwise lead to a higher-than-normal coefficient of restitution, or more “bounciness” — Coors Field featured immense numbers of home runs, including a major-league-record 303 in 1999. Home runs, as well as scoring, dropped significantly after the humidor was installed.

Just not enough to make Coors Field anything like a normal ballpark. Even with the humidor, Coors Field has had more home runs over the last three seasons (570) than any other National League ballpark.