The best time to visit Mount Vernon is during the late spring and early autumn months, specifically from May to June and September to October.
These periods offer the most agreeable weather conditions for exploring the area. You'll find comfortable temperatures, typically ranging from the mid-teens to low twenties Celsius (60s to low 70s Fahrenheit), which is superb for outdoor activities without the intensity of summer heat or the chill of winter. The natural scenery is particularly appealing during these times, with wildflowers blooming in spring and the foliage changing colours in autumn.
For those keen on outdoor adventures like hiking or fishing, May and June are ideal. The rivers and trails are usually in excellent condition, and the wildlife is active. It's also before the peak summer crowds, offering a more tranquil experience.
If you're interested in local events and a slightly more relaxed pace, September and October are splendid. The harvest season often brings local markets and festivals, and the cooler, crisp air makes for pleasant walks.