As fall approaches, it’s almost time for peak leaf-peeping in Pennsylvania. However, predicting the precise timing can be challenging due to climate change affecting when leaves change color and how vibrant they become. Here’s a look at when to expect the most vibrant foliage in the Philly region:

  • Oct. 9: Leaves will start to change color in Philly, slightly later than in the surrounding suburbs.
  • Oct. 16: Peak fall foliage is anticipated in the Poconos, Chester, and Montgomery Counties.
  • Oct. 23: Philly, Delaware Counties, and South Jersey are expected to see peak colors.
  • Oct. 30: Fall foliage across the state and region will have passed its peak.

This year’s colorful autumn display is attributed to timely summer rainfall and moderate temperatures. has created a fall foliage prediction map based on historical weather data, tree species information, and user data.

As nights grow longer and there’s less sunlight, leaves stop producing chlorophyll, allowing the vibrant yellows, oranges, reds, or purples to emerge. To experience the best of fall foliage, consider visiting parks like Wissahickon Valley Park, John Heinz National Wildlife Refuge, Morris Arboretum & Gardens, Bartram’s Garden, or Fairmount Park. For an exceptional experience, venture beyond Philly to Big Pocono State Park in Tannersville.