Color change and timing depend on the weather in the fall, but cooler nighttime temperatures and shorter days should enhance the colors, Ross said.

Leaf peeping — the act of traveling to witness nature’s annual kaleidoscope — contributes billions of dollars to the economy, especially in New England.

Leaf peeping — the act of traveling to witness nature's annual kaleidoscope — contributes billions of dollars to the economy

Leaves around the northern U.S. are starting to turn orange, yellow and red, inspiring legions of leaf lovers to hop in their cars and travel to the countryside for the best look at fall’s fireworks.

Leaf peeping — the act of traveling to witness nature’s annual kaleidoscope — contributes billions of dollars to the economy, especially in New England and New York.