Long story short - I picked up 5 new chickens yesterday. Two are 6-month old silkies (they had a large run, but did not free range). Three are 9-week old large fowl (orpington, rhode island red, black star). They are currently in the coop. When would you say it is safe for me to let them venture into the yard and forage? The weather is going to be beautiful the second half of this week, so I would hate to have them cooped up for too long. Thanks!!