Unfortunately your descriptions don't tell anyone what species your plants are.
The "Hyacinth Blue" ginger is most likely Dichorisandra thrysifolia, which is commonly called "Blue Ginger", but its actually not a ginger at all, its in the Wandering Jew family.

"Scarlett Red" ginger could possibly be hedychium greenii..."REgal White" could possibly be hedychium coronarium...but its a toss up without the botanical names, or even more descriptve common names, like "Butterfly" ginger or "Hidden lily" ginger, etc

i think the gingers will do great in winter, planted inground, with plenty of mulch during cold weather.

About blue ginger, I dunno. will probably need to be potted and overwintered in a protected area. Mine is planted inground and I know it will come back, but presently completely absent.

Barb -- I don't know what kind of gingers you have, but I grow Hedychium (butterfly ginger), costus (spiral ginger), and curcuma in the ground in Arlington. All do well for me.

Kristin

I am in columbia, sc, on the line between 7 & 8 and mine are in the ground also. I also have a few in pots and they are outside all year also. They are all in part sun during the day and do great.

I grow butterfly ginger, curcuma and pinecone ginger in the ground in zone 8b and they all do good. One pinecone is just starting to peek through the dirt, while the other has been up for about 2 weeks. It also gets as hot as Hades here.

Sharon