LOUISVILLE, Ky.—Reigning Horse of the Year Curlin will be retired next year, and may already have run his last race.

Majority owner Jess Jackson, who has an 80 percent stake in the horse, said in a statement issued Sunday that he’ll consider offers from farms in Kentucky before deciding where Curlin will stand at stud.

“He always gave it his all and has done everything we have asked of him,” Jackson said. “I am looking forward to seeing his foals compete and possibly exceed his unequaled racing record.”

Until his future home is selected, Jackson said Curlin ...

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