Unlike wooden posts, these posts show no sign of deterioration. Last year, those 40 boxes fledged 154 bluebirds. If you put a box within a raccoon s reach from a fence, tree or other climbable structures or objects, even the most raccoon-proof post won't help. In Wisconsin, the bluebird s nesting season mainly runs March through July. The birds generally raise two broods per season.
Most monitors try to put up new nesting boxes in fall, or as soon as the ground thaws in spring.
Open areas with short grass and widely scattered trees, such as lawns, country roadsides, mowed cemeteries and golf courses provide excellent bluebird box sites. The sites should be well away from woods, large trees and livestock feeding areas. Suburban and rural property owners, especially government and corporate property owners, tend to be very happy to give permission for the erection and weekly monitoring of bluebird nest boxes. It's a simple matter to convert paired deep boxes to smaller-volume singles. First, place blocks of 2x4 lumber inside at the bottom of the deep box until the top block is about five inches or less from the hole.