It can vary quite a bit! There are plenty of websites that have predictors if you’re planning a trip. It’s most helpful to look at last year’s peak foliage dates when booking a fall foliage trip to Stowe or Woodstock, VT, and use that to plan your trip. Here is a website that will give you an idea of what dates were best for leaf-peeping last year. I find that anywhere between October 5th-20th tends to get you decent colors!