The best time to go to Rockville is during the spring (April to May) and autumn (September to October) months.These shoulder seasons offer pleasant weather, with warm days and cooler evenings, making it ideal for outdoor activities like hiking and exploring the nearby national parks. You'll find fewer crowds compared to the peak summer months, allowing for a more relaxed and enjoyable experience. What's more, the natural scenery is particularly stunning during these times, with wildflowers blooming in spring and the leaves changing colour in autumn.For those looking to avoid the busiest times and enjoy comfortable temperatures, these periods offer a great balance.