When can five & half week old chicks go outside?

[GroovyChicksUK]

Hi, we live in London, England and have three 5 1/2 week old chicks. The weather has been good so far.. currently 54f and dropping slighty over the next few days. Typical bank holiday weather!
We have bought an Omelet Eglu to put them in, can anyone advise us when they can go outside.

Many thanks

 

[hokankai]

I would say 8 weeks old is a safe bet. At that point they are fully feathered and able to withstand cooler temps.

 

[nurse_turtle]

I would send them out now with supplemental heating.