NEW YORK — For more than three months, Aaron Judge’s season existed mostly in checkpoints.

Another scan. More healing. Light activity. Batting practice. Running. Outfield work. Live pitching.

Now there is finally another checkpoint that matters.

Game day.

The New York Yankees activated Judge from the 60-day injured list Monday night, clearing the three-time American League MVP to return Tuesday against the Colorado Rockies at Yankee Stadium. New York designated right-hander Chase Hampton for assignment in the corresponding 40-man roster move.

Judge has not appeared in a game since May 31.

That absence began with uncertainty and eventually became one of the defining storylines of the Yankees’ summer.

Judge was diagnosed in early June with a stress fracture of the first rib on his right side. He believes the injury originated with a diving play against Houston in late April and worsened as he continued playing. The Yankees initially hoped rest would solve the problem quickly, but the healing process required patience.

Judge missed 84 games.

Now he returns with 19 left.

That is what makes this more than a standard September activation.

The Yankees enter Tuesday at 81-62, four games behind the Tampa Bay Rays in the AL East. They also remain in strong Wild Card position, but Boston is close enough behind them to make every remaining week meaningful.

Judge cannot erase three months in one swing.

He does not have to.

Before the injury, Judge was batting .248 with a .375 on-base percentage and .533 slugging percentage across 59 games. He had 17 home runs and 38 RBIs.

Those numbers were below the outrageous standards Judge has established during his career. They were still the production of a hitter capable of changing the geometry of a lineup.

That is what New York has been missing.

The Yankees survived Judge’s absence well enough to remain firmly in the postseason race. They went 45-39 during the 84 games he missed, according to Reuters.

Survival, however, is different from becoming the team New York wants to be in October.

Judge changes how opposing pitchers approach an inning. He creates traffic because pitchers are reluctant to challenge him. He creates opportunities for the hitters around him. And when a mistake reaches the middle of the plate, few hitters in baseball can punish it as dramatically.

The challenge now is physical.

Judge did not go on a traditional Minor League rehabilitation assignment. Instead, he progressed through controlled baseball activity before facing live pitching Monday at Yankee Stadium. Manager Aaron Boone has indicated that New York can be creative while rebuilding Judge’s workload, including potentially playing him for five to seven innings before removing him.

That matters.

The Yankees need Judge in September, but they need a healthy Judge more.

There is little value in treating his return like an emergency sprint and risking another setback before the postseason.

The timing also creates an interesting contrast.

When Judge disappeared from the lineup, there were more than 100 games remaining. The season was still taking shape.

He returns to something entirely different.

Every loss now changes the mathematics.

Every Tampa Bay result matters.

Every Boston surge creates pressure.

And every Yankees win shortens the road toward October.

Judge has spent months watching that race rather than influencing it.

Now he gets the bat back.

There is also something fitting about the location. Judge will return at Yankee Stadium, where the anticipation surrounding his recovery has followed the club throughout the summer.

The Yankees do not need him to hit two home runs Tuesday.

They do not need him to immediately look like an MVP.

They need quality at-bats. They need his presence. They need his body to respond.

Then they need to see what happens.

Nineteen games are not enough time for Judge to rebuild an entire season statistically. They are more than enough time to change New York’s postseason position.

That is the real significance of Monday’s transaction.

Aaron Judge is no longer progressing toward a return.

He has returned.

And for the first time since May 31, the Yankees will enter a game knowing that No. 99 can help decide where this season goes next.