Orland,
I put your question to google and up came a few forums of people talking of their winter
gardening. One mentioned planting now for later results. There is a pinterest post on this,
those are always great for photos and if you follow the photo by clicking a few times
you will reach the author's website or blog. Someone even mentioned Elliott's book.
Winter Gardening in Michigan
I was doing some posting to a
thread on "pit house" or Walipini greenhouses over
the weekend.
Here is the link to that thread
Underground Greenhouse
The various posters talk about their own Winter versions, some are not dug in but
still produce veggies.