From a press release seen at Hospitality NET:
Several very popular Niagara events happen this unexpected time of year from the Niagara Falls International Marathon to spectacular leaf peeping in the surrounding areas and Door Open Niagara, a tour of historical and architecturally significant attractions. Fall in Niagara Falls brings a slower pace, cooler air, and stunning fall foliage, providing the perfect timing for these seasonal events — all while popular attractions continue to thrill visitors.