I have read about it, but never did it. We did have someone who tried it, and kept us posted one winter. Can’t remember who it was though.
I saved a bunch of plasic food containers and poked holes in the top, filled with dirt and planted seeds of every kind. Usually, I stink with plants so it was a nice surprise to raise so many ‘super seedlings’ that year. Apparently, the repeated freezing/thawing made the seeds strong. Who knew???