GREEN BAY (WLUK) -- As autumn decorations begin to appear, the trees in Northeast Wisconsin remain predominantly green. According to Karen Stahlheber, associate professor of biology at the University of Wisconsin-Green Bay, the region is not expected to reach peak fall foliage until early to mid-October.

"They start to want to save their nutrients so they don't lose them all during the winter when the leaves drop," said Stahlheber. "So they stopped producing new green coloration. So when the green breaks down, we see all the other colors that are there in the leaves."

Stahlheber explained that weather conditions play a crucial role in determining the vibrancy of fall colors.

"There's a lot of different factors that determine how bright and how colorful different trees are. One of the big ones is the weather that occurs prior to the leaf color change and also the weather that happens in the summer," she said.

Cold nights are particularly significant for enhancing leaf colors.

"Cold temperatures, especially at night, lead to brighter colors in leaves. But you also have to weigh that against what happened during the summer," Stahlheber noted.

However, an early frost could shorten the season.

"If you get a really early freeze or frost, it could cause the trees to drop their leaves early, and then they might not get as bright as they otherwise would," she said.

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Despite the potential impact of summer weather, current conditions are favorable for a vibrant display.

"Cold nights and relatively clear sunny days, and that usually will lead, especially for red, to the brightest red colors," Stahlheber said.

With about a month to go, the anticipation for the fall color display is building, and the vibrant hues are expected to arrive soon.