End of season or beginning? In spring I'll keep em in pots and bring em in until its a bit warmer, like staying in the 60's, until I transplant into the ground. I mean they'll def take 55 I just selfishly want to keep em growing fast as possible in spring to get them big.
For fall I hope for some good colors and stop feeding. Once its getting that cold they're not taking up much food or growing.
Theres def strains that can thrive in lower than usual temps though. If you want em out in the garden its probably almost safe, just cover them from frost and snow if theres more still.