Whale Facts: Grey whales may reach up to 50 feet in length and weigh up to 45 tons. They travel 70 - 80 miles per day at a rate of three to five miles per hour. During their migration the whales will travel in small groups and stay fairly close to the shoreline. During the March-June migration, the whales lead their new-born calves back to the Arctic waters. Look for the blow --- a puff of steam standing up to 12 feet off the water. Where there is one blow, others are sure to follow as they tend to travel in groups of two to six.