Typically, mid-October into early November is the peak time to see the leaves turning here in Korea. Just as wonderful as the spring blossoms (click here) the Autumn/Fall foliage is breathtaking. For us South Africans, we just don't get sights like this back home. The trees turn of course, but it's just nothing like the sea of red and yellow that greets you here in Korea.
The four best mountains to see the Autumn colours are Naejangsan (내장산) just outside of the town of Jeongeup, Jirisan (지리산) which is close to Namwon, Seoraksan (석악산) in Gangwon Province and Gwanaksan (관악산) which is closer to Seoul.
Last year we only made it to Naejangsan (pictured below) and this year I hope to make it to Jirisan. As with many outdoor activities here in Korea, be prepared for the crowds! We were stuck on a bus for 2 hours making our way to Naejangsan, due to the hoards of people and cars, and eventually jumped off the bus and decided to walk the 5km road from the base of the mountain to the actual main viewing. It was a logistical nightmare. But, as long as you know it's going to be chaos and you are prepared for that, you will be rewarded with stunning sights.