I treated myself to a nice incubator and egg turner for Christmas (actually from my wife). I have 10 chickens in which 2 are roosters. They were all born late last spring so they are all young, although almost fully grown. When can I expect to get fertile eggs? Easy answer is when you see them going at it. I have seen that once, but the coop is 100 feet from the house and I only see them when I feed them or go to visit. It's winter time, so visits will be fewer. Will the hens sit on the eggs only if they are fertile? is springtime the best time to expect fertile eggs? They don't sit on them now. They have 9 nesting spots, but they choose to hang out on the rafters if they are not outside in the run. They do lay the eggs in the nests though. I'm sorry about all the questions, I did a search but did not find much. I may have been a little impatient too.