I would keep them indoors until they are about the size of a kick ball (I know that's random but I can't remember what exact week I put mine outside and they did amazing). I'm sure someone else will comment and let you know a for sure age range in weeks.
When they are that little they truly need those consistent high temperatures in order to survive and develop into healthy happy chickens. Also for their safety it's good to keep chicks together away from any threats such as other animals, predators, etc. I included a chart that displays temperature needs based on age in weeks. May I ask what the reason is behind you wanting to move them outdoors quickly?
I don't know if you have older chickens out in your coop, but it's worth mentioning if you do that they will more than likely peck/bully the new chicks (pecking order establishment) and when the chicks are that young and still developing it can cause injuries, brain damage, or even death. They are super fragile when they are small so if you can hang in there until they have the required survival capabilities and skills that would be in the best interest of your sweet babies.
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