Tour operators started seeing grays around the first of December, and there's been an increase of about 50 percent this season. The last grays will be northbound cows and calves around the middle to end of May. By then, fins and humpbacks have come into the area. The first blue whales will show around the middle of April, with an abundance of fins and blues through the summer. The last blue whale departs around the time the first gray whales reach Southern California.