Leaf-peeping season is about to begin! Summer's high temperatures have cooled for much of the eastern U.S. as temperatures dipped 10 to 20 degrees below the historical average for the first week of September.

The Old Farmer's Almanac says leaves can change color from mid-September to early November. "Typically, the second and third week of October are the peak times, but it shifts depending on where you live and your local weather conditions," the almanac says.

The Weather Channel says warm, sunny days are ideal for stunning fall colors, but only if they are followed by cool nights. The color display can also be influenced by precipitation; excessive rainfall and severe drought are bad for foliage.

Some of the most vibrant fall colors can be found in New England. Every year, roughly 10 million leaf-peepers visit the region to enjoy the beauty of fall. Northern Vermont, New Hampshire and northwest Maine often have their peak season in early October.

Here's a county-by-county breakdown of how foliage is predicted to change across the United States: