Q.When to pull and how to prepare plants to create “bare roots”
I would like to completely rebuild several of my garden areas. Cold weather will soon be here and I would like to pull all of my perennials and save them as “bare roots” until next spring when I can rebuild my gardens with better, amended sold and raised garden areas. I have no idea how to or when to prepare them to over-winter as a bare root. All the articles I find on the net refer to planting received bare-roots.

Certified GKH Gardening Expert
The following article should help you:
http://depts.washington.edu/propplnt/Chapters/Bare%20Root%20Chapter.htm
See the sections on storing and planting bare root plants, and the links at the bottom. Also scroll all the way to the bottom to learn about which plants should not be stored with bare roots. Evergreens and plants that are already quite large might do better if they are dug up soil and all and transplanted into pots or heeled in. See these articles:
https://www.gardeningknowhow.com/ornamental/trees/tgen/transplanting-trees.htm
https://www.gardeningknowhow.com/garden-how-to/info/heeling-in-plants.htm

PLEASE NOTE! I have asked about pants, not trees or shrubs. Mainly perennials. AND, the question is how to prepare them to be saved as "bare root." Thanks!