This massive pileup occurred on December 29, 2017 near Muskegon, Michigan.
From the ViralHog YouTube video description:
"My wife and I were involved in a thirty car pile up on Southbound US31 in Muskegon Michigan. We were able to avoid hitting anyone by driving in to the median so I shot video and gave a play by play of the cars crashing in. As the video is being shot we are hit three times. Cars, trucks, parts, and snow, flying everywhere."
Makes you realize if you're in the same situation you should stay in your car!
Warning: some profanity.