Map shows when fall foliage peaks in Pacific Northwest, but forecast says it might be dull in some places

(NEXSTAR) – Starbucks is serving pumpkin spice lattes. Kids are back to school. Halloween decor is out at stores. It's only a matter of time before the next harbinger of fall arrives: the colorful changing of the leaves.

But only half of states are expected to see vibrant fall foliage this year, long-range weather experts at Accuweather predict. And some places in the Pacific Northwest might have a fairly dull fall foliage year.

"We expect vibrant colors across much of New England and the Midwest this autumn," said Accuweather's Paul Pastelok. The areas with more vibrant leaves had consistent rainfall in the spring and summer, contributing to healthy leaf growth. Plus, they need cool nights in the early fall, signaling the change in season that brings fall colors.

The aspen trees in Col