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yes thats my only down fall is in the winter. would it be too much with 30 birds cooped up on snowy days when they wont go out.
In theory, if all of your floor space is available (raised nest boxes, outdoor feeders/waterers), you could handle 30. Make sure you have TONS of roost space available, because the more places they have to get away from one another the better. Keep in mind, the more birds you have, the more cleaning you will be doing. And whatever cleaning you're doing in the summer with your number of birds, you can count on quadrupling that in the winter time. If you can do dropping boards, I'd do them.
You'll have to keep an eye on them, watching for feather picking and bullying. That'll be your best indicator for whether they are overcrowded in the winter time.