Breeding takes place from March to June on the sea ice, but most occurs during April and May.
During the breeding season, males and females find each other by congregating in the best seal-hunting habitats.
Male polar bears have been seen following the tracks of breeding female polar bears for more than 100 km (62 mi.). Scientists are uncertain what signals males use to track breeding females.
https://seaworld.org/animals/all-about/polar-bears/reproduction/