The best time to visit Castile, New York, is during the summer months, from June to August, and the autumn, specifically September and early October.Summer offers the warmest weather, great for outdoor activities like hiking, boating, and exploring Letchworth State Park. The long daylight hours mean you can make the most of your days, and many local attractions are in full swing. It's a great time for families looking for an active holiday with plenty to do.For couples or those who appreciate natural beauty, early autumn is truly spectacular. The foliage in and around Letchworth State Park transforms into a breathtaking display of reds, oranges, and yellows.