Sounds like the chicks will have a good habitat.
Release them at about 5-7 weeks old.. in the Spring.
They will have adequate vegetation and bugs to eat.
The only thing you will have to be concerned about is predators, hawks, coyotes, foxes.
If you have a lot of these type predators you may not have too much luck with reproduction in the wild.
You may want to put out some watering pans in the area of release at first so they do not dehydrate, if it is a dry year.
Good luck!!!