We have a door to the run that I close at night once they have put themselves up. We have bird netting across the top and chicken wire on the sides. No weather protection.
When they were babies they were locked in the coop for several days but eventually found their way out to the run at...
Some of my new chickens (born in March) won't go into the coop at night. They will come into the large run and roost on a branch or the metal roof of the feed cover but not go into the run. We have a solar light that I turn on at dusk to encourage them to go inside. Some of them figured it out...