Urban Heat Island (IMAGE) University of Wisconsin-Madison Caption Within the study site of Madison, Wisconsin, researchers found that while the growing season lasted up to a week longer in the city's densest areas, its parks subdued the warming effect and thus helped to normalize the growing season length. Credit Samuel Zipper Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.