There may be a few lucky gardeners who can garden all year round in the US, but for most of us in the US and Canada that isn't an option. What does make sense, though, are soil improvement strategies that "work" over the winter. For instance, you can grow a cover crop, or spade your garden, or spread compost or autumn leaves.
Is anyone using any of these techniques or something else? If so what are you doing, and how is it working?
PS: Most years, I sow a cover crop of rye grain or rye grain plus crimson clover, then dig it in come spring. I'll also throw down some ryegrass seed in bare spots or paths. I do this on half the garden plot, then spade most of the remaining half, all that doesn't have an over-winter crop growing on it. I'll dig in compost on the non-cover cropped side too, over the winter.
This has worked very well for me, moving toward the 'regenerative ag' vision of improving the soil wihile growing on it. I especially like cover crops. The only challenge is getting rye to stop wanting to grow in the spring. And, of course, if you wait too late to sow, you won't get much of a result.
I'll save the discussion of spading v. no-till for another time. Pipe up if that interests you.