Bears have been clocked running as fast as 30 miles per hour. In winter, though, the heavy coat and extra weight slows them down somewhat.
Bears do not need flat ground when they run. They are able to sprint uphill and downhill, as well. Bears run well on a variety of surfaces, such as pavement, dirt or grass. The animals sprint quickly, but they also have staying power. They are capable of maintaining a constant fast speed for at least 2 miles. Even over this distance, a bear matches the rate of a horse. Yearling cubs run as fast as adult bears.