hardening off

so when you start things early inside, or in a green house, at some point you have to take the plants outside,
but if you just take them outside, they will likely die,
so you have to harden them off,
you do that by taking them outside for a sort while in the day, and taking them back inside at night,
then you increase the time outside each day,
I usually start with an hour or 2 the first day,
then 4 hours the second day,
then 8 hours the 3rd day,
then all day outside for another 5 days,

other people do it faster, some slower,
it is not the temperature that is going to be the issue,
it is usually the wind
and secondly it is the humidity,
so don't think you can skip it.

and don't forget about the separate topic of transplant shock,
some plants don't like having there roots messed with