Cannot comment on C. largiceps, but I have kept C. cruentatus and hibernated mine from Late October to Mid-February. They seemed to do quite well. The fridge temperature was around 7 - 10 C.
Do make notes to check on them weekly to make sure the hydration is adequate, but not too much. A great way to look at it is to see some slight condensation droplets, if there is none it may be too dry in the nest which can be dangerous.
I took a younger colony out and they began to eat a cricket 2 hours out of diapause in the attached photo from a few years back. I also offer them a wider range of food, they like:
- Liquid protein :
Tablespoon of raw egg yolk + tablespoon of honey + small coffee cup [general average size 8-12 oz] + tablespoon of white granulated sugar + two drops of blue food coloring) . Mix well for 1-2 min.
-- This helps you see that they're taking in the right foods and vitamins from the yolk & the sugar diet which will be a visible blue in their social stomachs (and in the larvae too).
- Crickets dropped in boiling water (kills chances of pet-store grain mites)
- Mealworms dropped in boiling water
- 2-5 live Fruit fly larvae (D. hydei [the larger variant])
Hope this helps & good luck!