We are just now hitting where nights are at/under 60 F degrees (15.5 C) which is usually when I would bring him inside to his indoor nightbox. I’m curious when others start doing that.
I don't. My Russians live naturally. Once they stop coming out to sit in the sun I gather them up and put them in their hibernaculuum. I prop the lid open daily but once the nights get down in the 40s I close 'em in.
I don't do anything as long as night temps are above 50°F. We still have warm afternoons that warm to 85-90°F. The Russian tortoises are more active with cooler nights like this than they have been all Summer. Eating, drinking, walking around.
This doesn't work in all climates, but for us, they can stay outside (with good hides) until they wind down for brumation. We do the brumation in fridge.