Blue whales migrate to every hemisphere from freezing polar water to warm tropical temperatures of the equator. Blue whales live in every corner of the ocean but mostly live in deep water like the mariana trench. Blue whales migrate around the world when it's feeding season. Blue whales are found in polar water away from the equator. During mating season blue whales migrate toward the warm tropical water of the equator. Blue whales can be found living in deep offshore waters of the southern or northern hemispheres in freezing arctic waters when it's feeding season. Although blue whales can be seen living near the equator a vast majority of blue whales will limit how close they get to the equator due to their thick layers of blubber