Welcome to the forum, glad you joined. 
In my opinion you have two distinct issues. One is whether they can handle the weather out there. How old are they and where are you so we know climate? What are your coldest temperatures expected for the next several days and nights?
The other is integration and is more complicated. Until they mature enough to force their way into the pecking order immature chickens are always lower in the pecking order than more mature chickens and some are really quick to enforce their pecking order rights, especially if their personal space is violated. Many of us integrate really young chicks regularly without many serious issues, there are techniques to handle that. Which techniques might work for you will depend a lot on how much room you have in the coop and outside, and when that room is available. Again, weather could play a part.
So how many chicks do you have, I'm a bit confused on that, and how old are they. How many adults do you have? Where are you? How big, in feet or meters, is your coop and your run. Photos inside the coop and a general one outside showing how the coop and run is set up could be very valuable.

In my opinion you have two distinct issues. One is whether they can handle the weather out there. How old are they and where are you so we know climate? What are your coldest temperatures expected for the next several days and nights?
The other is integration and is more complicated. Until they mature enough to force their way into the pecking order immature chickens are always lower in the pecking order than more mature chickens and some are really quick to enforce their pecking order rights, especially if their personal space is violated. Many of us integrate really young chicks regularly without many serious issues, there are techniques to handle that. Which techniques might work for you will depend a lot on how much room you have in the coop and outside, and when that room is available. Again, weather could play a part.
So how many chicks do you have, I'm a bit confused on that, and how old are they. How many adults do you have? Where are you? How big, in feet or meters, is your coop and your run. Photos inside the coop and a general one outside showing how the coop and run is set up could be very valuable.