Not much worse than a muddy area when you are not expecting it. My wife and I took a walk a while ago to a new park. I was thinking the ground would be frozen and there wouldn't be any issue but about a quarter of the way through our walk we were stuck in the middle of a muddy mess. Our best option was to just power through it instead of cutting our walk short.
This run is all on hard paths, so no mud to deal with. Its a shame I couldn't record a proper time. Some people seem to enjoy a muddy run, but I don't really. That said, it's good to have some variety.