How far from top should hole be on Mountain Bluebird Nest Box?
The cold season is the perfect time of year to work on building or renovating Mountain Bluebird nest boxes in preparation for the year ahead. One common question we often hear is “how far from the top should the entrance hole be on a nest box?“
An ideal nest box for Mountain Bluebirds has a sanded maximum 3.97 cm (1 and 9/16”) diameter entrance hole approximately 5.0 cm (2”) below the front roof top.
Remember that the roof top should overhang the entrance hole at a 22.5° angle to provide protection from rain. And perches should not be placed on the birdhouse, as they only encourage House Sparrows to take up residence.
We recommend reviewing our Nest Box Building page for the best and most complete advice on all specifications and blueprints for Mountain Bluebirds.
