Does plant material decompose competely over the winter?

I was wondering if I dug a large hole some time in october, and filled it with plant material, shredded newspaper and kitchen scraps (essentially making a compost heap, in a hole), will it decompose completely over the winter? Can it be used for growing plants in the following year? Would adding compost worms help speed up the process? Would I still need to mix in soil to prevent nute burn?

Thanks in advance!

Bacteria and fungus decompose the material, and if they're frozen - no decomposin'

They'll take right off next year, though. Assuming the layer isn't too thick. Worms always help and are always a good idea.

Thanks for your reply. I live in a climate where it only freezes about two, three weeks per year at most. The time range I had in mind was 6 to 7 months (Start in mid october, plant stuff in mid may).

You'll be groovy here in a couple weeks man, when spring rolls around water it down with some good ACT to kick start dat bitch

ACT...good stuff I already poured it on my compost piles back in October, and I'll do it again in March!