I have month old silkie chicks. They have recently started to have no heat lamp during the day. Eventually I need to put them outside lol, but because it’s so cold, I don’t know when to start introducing them to the outside. The highest temperature recently has been about 45-50° Anybody have advice?
You can START introducing them to outside right now. Take them out to play for half an hour or so, as many times each day as you like.
The first time they will probably peep and be upset because it's new and scary. But over time, they will start to like it. Once they are having fun, you can tell how long to keep them out by watching how they act: huddling and peeping means they are cold and need to go back inside to warm up, but they can safely stay outside as long as they are happily doing chicken things (eating, dustbathing, chasing bugs, exploring, etc).
The amount of time they spend outside can get gradually longer as they get used to it, until they are spending all day outside.
After a few days or a week of being outside all day, then you can start letting them sleep outside too.
If they still have a heat lamp at night, they should learn to sleep without it while they're still inside at night. That makes it a smaller change when they finally sleep outside. The first night with no heat lamp, they will probably peep and fuss because darkness is new and scary. Give them an hour or so, and they will probably go to sleep just fine, and after that first night they won't fuss so much.