In addition to what others have said, I have 2 things for you to also consider:
(1) In case you are not aware, the natural distribution of Mountain quail ranges from Washington south to Baja California, and scientists have divided up the Mountain quail populations into multiple subspecies based on differences in their feather/plumage characteristics. In the mountainous areas around Portland, Oregon, the Mountain quail subspecies is likely Oreortyx pictus palmeri. The males of the palmeri subspecies differ from males of the other subspecies in that they tend to have a lot of brown on their shoulders (the difference is similar to how the Florida panther is unique from other mountain lions in the U.S.); males of the other subspecies tend to have blue-gray on the shoulders. In the bird breeding hobby, people did not keep the subspecies separate (i.e. mentality of always trying to incorporate new bloodlines into their stock) and so birds of the hobby are a mixture of multiple subspecies. So, you will have to ask yourself whether or not you want to preserve the uniqueness of the palmeri subspecies found naturally in your area. Perhaps you may ask your Fish and Wildlife agency to see if you may try to propagate your local Mountain quail subspecies instead of using/releasing birds from the hobby?
(2) Mountain quail of the hobby are unfit to survive in the wild. Whether you are releasing adults or have a foster bird parent raise the young to adults in your yard, the many years and decades of domestication have caused Mountain quail of the hobby to be inferior (i.e. less alert and slower reaction time) compared to the wild Mountain quail. You would be feeding the predators if you are releasing birds. The wild Mountain quail, with all their fitness, alertness, and quickness, still fall prey to predators but are able to hang on with their populations.
(1) In case you are not aware, the natural distribution of Mountain quail ranges from Washington south to Baja California, and scientists have divided up the Mountain quail populations into multiple subspecies based on differences in their feather/plumage characteristics. In the mountainous areas around Portland, Oregon, the Mountain quail subspecies is likely Oreortyx pictus palmeri. The males of the palmeri subspecies differ from males of the other subspecies in that they tend to have a lot of brown on their shoulders (the difference is similar to how the Florida panther is unique from other mountain lions in the U.S.); males of the other subspecies tend to have blue-gray on the shoulders. In the bird breeding hobby, people did not keep the subspecies separate (i.e. mentality of always trying to incorporate new bloodlines into their stock) and so birds of the hobby are a mixture of multiple subspecies. So, you will have to ask yourself whether or not you want to preserve the uniqueness of the palmeri subspecies found naturally in your area. Perhaps you may ask your Fish and Wildlife agency to see if you may try to propagate your local Mountain quail subspecies instead of using/releasing birds from the hobby?
(2) Mountain quail of the hobby are unfit to survive in the wild. Whether you are releasing adults or have a foster bird parent raise the young to adults in your yard, the many years and decades of domestication have caused Mountain quail of the hobby to be inferior (i.e. less alert and slower reaction time) compared to the wild Mountain quail. You would be feeding the predators if you are releasing birds. The wild Mountain quail, with all their fitness, alertness, and quickness, still fall prey to predators but are able to hang on with their populations.