This animation illustrates the general warming that has occurred from 1990 to 2006. Click the play button to see how the hardiness zones have changed.
Play will change the map from the 1990 USDA hardiness zones to the 2006 Arborday.org hardiness zones.
Reset will change the map to show the 1990 USDA hardiness zones.
Differences shows colors that represent how much each zone has changed since 1990. For example, the pink areas of the map have warmed up enough to change one hardiness zone (e.g. the top half of Nebraska has increased by one zone).