Hiya,
Well, I think I'm probably a bit of a scaredy cat
as, although the two piggies I adopted last October, Maisy & daisy, (Daisy now RIP, but Mum, Maisy, we still have, along with our new addition, Dotty, Maisy and Daisy were always kept indoors, within a school corridor! Since we've erected the hutch and te weather started to warm, probably May time, I've put them both outside during the day and brought them in around 8=9pm.
I know they'd be fine outside during the night, especially now it's summer, but I just don't feel I can do it yet. Silly really, I know, but I'm a bit of a worry wart and know I would be up in the early hours, possibly tempted to check on them, lol. Plus, having to worry over them, just makes it worse for me and moreso for my family, lol, they'd be dreading it hee hee.
I think though, if yours are outdoors, or rather if it were mine, going according to our weather approaching the winter, I would probably bring mine in around the middle to end of October, as it does start to get cold moreso around this time, merging onto November.
Sorry for the waffle. xx