Although the likelihood of a yurt being struck by lightning is quite low, it certainly could be if it is the tallest thing around. According to the National Weather Service, height, isolation and a pointy shape are the dominant factors controlling where a lightning bolt will strike. If a yurt is to be installed in an area known for having lots of thunderstorms or will be standing in a meadow by itself, it might be worthwhile to install a lightning rod adjacent to the yurt, that is taller than the yurt itself.