Fred,  You can put boxes every hundred yards around the field but all must
be mounted on posts with predator guards.Experiments have shown success
with boxes mounted back to back with a different species in each.
Properly protected, the largest problem may be busy bee wrens who love to
fill cavities with twigs. Bluebirds are quite area tolerant with each
other. John

On Tue, Jul 19, 2022 at 3:14 PM Fredric Kardon <>

> I have a large field and have put up some bluebird/tree swallow nesting
> boxes.  I am considering putting up some more, but would like to know how
> many acres is needed to support one bluebird or one tree swallow nest box?
> I have searched the internet and gotten conflicting answers.
> Thanks,
> Fred Kardon
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