Most of western Pennsylvania will see the best fall foliage of the season this week, while other parts are seeing colors start to fade, according to the latest fall foliage report provided by the state's Department of Conservation and Natural Resources (DCNR).A new fall foliage map for Oct. 21 through Oct. 27 was released Thursday. Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette, Greene, Lawrence, Mercer, Venango and Washington counties will all see fall foliage peak this week.Colors in Westmoreland and Somerset counties are starting to fade, according to the map.The DCNR said in Venango and Clarion Counties, dropping temperatures have "kicked fall color into full gear." "Visitors to Keystone State Park in Westmoreland County will be excited by the colors surrounding Keystone Lake. Route 381 from Ligonier to Farmington provides beautiful, rural views of fields and forest. A visit to Ohiopyle State Park will offer unforgettable views of the Youghiogheny River and forested hillsides with their best fall colors. Laurel Hill State Park in Somerset county will continue to show peak color early this week; but don’t delay, colors will fade here quickly," the report said. See the full map and report here.The Pennsylvania Department of Conservation and Natural Resources also published a list of prime places to view fall foliage.See the best places to view fall foliage in Western Pennsylvania here.