The Pennsylvania Department of Conservation and Natural Resources produces fall foliage maps each year!
To learn more about why leaves change color, check out: https://elibrary.dcnr.pa.gov/GetDocument?docId=1738838&DocName=sf-WhyLeavesChangeColor.pdf
Governor Shapiro's office published a Press Release on September 17th, 2025 announcing a new Fall Foliage Map format for 2025: https://www.pa.gov/agencies/dcnr/newsroom/shapiro-administration-launches-new-weekly-fall-foliage-report
Take a look at the Climate Prediction Center outlooks for the next couple months: