Thanks Gaby, it depends on many factors if temperatures are already low and days are shorter they might hibernate and come out in spring… as they live only 2-4 weeks they could theoretically come out and after mating their eggs would then hibernate… but the new caterpillars would need to find plants they could feast before turning into pupae, the eating process is also between 2-3 weeks. I will likely put the chrysalis on my balcony and protect it with thin fleece so no predator can get them and to see if they will hibernate… (natural temperature as in opposite in my apartment).
I read somewhere that it’s possible that a butterfly can stay actually quite long in a chrysalis, when conditions are right it will emerge.
2 years ago I had 2 butterflies chrysalis and the 4 of them ate all my parsley and I went out to buy a new one… but it was earlier in summer…