I recommend using the same size entrance hole for western bluebirds and mountain bluebirds. What’s the Correct Entrance Hole Size for Western and Mountain Bluebirds? Entrance holes any bigger than this will allow entry to European starlings. Make sure that a circular entrance hole is no larger than 1 3/16 inches in diameter and a slot entrance is no larger than 1 3/16 inches tall. Note: There is a little wiggle room to have a larger entrance hole for eastern bluebirds on circular and slot style entrances. On my recommended tools page, I wrote about two great bluebird houses that I recommend. If you’re purchasing a nest box for eastern bluebirds, check that the entrance hole meets one of the above specifications before you buy it. Eastern bluebirds can use a smaller entrance hole than other species A horizontal slot entrance that is 1 1/8 inches in height.An oval entrance hole that is 2 1/4 inches tall by 1 3/8 inches wide, or.A circular entrance hole that is 1 1/2 inches in diameter. This contributes to their ability to fit inside of slightly smaller entrance holes than the other two species of bluebirds who have wingspans of up to 14 inches.Įssentially, eastern bluebirds need one of the following types of entrance holes: What’s the Right Entrance Hole Size for Eastern Bluebirds?Įven though eastern bluebirds weigh more on average than the other two species of bluebirds (up to 32 grams for an adult), they actually have the smallest wingspan, of up to 12.6 inches ( source). In this audio guide, I’ll tell you everything you need to know about attracting bluebirds in just 59 minutes and 38 seconds.Ĭheck out the Bluebird Landlord Audio Guide here. If you want to attract bluebirds to your yard THIS YEAR, the best place to start is the Bluebird Landlord Audio Guide. The Three Most Common Styles of Entrance Holes for Bluebird Houses Circular Entrance Hole Oval Entrance Hole Photo by John Brandauer, license: CC BY-NC-ND 2.0 Horizontal Slot Entrance Photo credit: Purple Martin Products Get one of these bird houses on Amazon here. Proper Entrance Hole Size for Bluebird Houses Bluebird Species Circular Entrance Hole Oval Entrance Hole Horizontal Slot Entrance Eastern Bluebirds 1 1/2 inches 2 1/4″ tall xġ 3/8″ wide 1 1/8 inches Western Bluebirds 1 9/16 inches 2 1/4″ tall xġ 3/8″ wide 1 3/16 inches Mountain Bluebirds 1 9/16 inches 2 1/4″ tall xīest Nest Box: My all-time favorite nest box for bluebirds is the Nature’s Way model CWH4. So, what is the proper entrance hole size for bluebird houses? The table below will show you the exact size of hole you need for the species of bluebird you are trying to attract and the type of entrance hole you are making. If you make the hole too small, it will stop bluebirds from entering, but if the hole is too large it will allow European starlings to enter and compete with the smaller bluebirds for the nest box. There are three species of bluebirds in North America and they each require a specific size of entrance hole to be able to use a nest box. The “entrance hole” refers to the opening, usually on the front of the nest box, where bluebirds enter the box. Whether you are buying a new bluebird house or building your own, you’ll need to know a few things about the proper entrance hole size for bluebird houses. But for Western and Mountain Bluebirds, you’ll just need to remove the predator guard over the entrance hole or replace it with this larger predator guard to ensure an adequate entrance hole size of 1 9/16 inches.How to Keep House Sparrows Out of Bluebird Houses Note: This box works for Eastern, Western, and Mountain Bluebirds. The best price I’ve found for this birdhouse is on Amazon. The see-through viewing window will add a layer of protection between you and the baby bluebirds when you sneak a peek to monitor the nest box. Then, my favorite aspect of this box is the easy, side-opening door that leads to a viewing window. The mesh liner at the bottom of the nest is a unique innovation in nest boxes that is designed to protect the young bluebirds from blowfly larvae, which can sometimes be a problem. The ventilation holes on the on the top and drainage holes on the bottom will help protect your birds from the summer heat and excess moisture in the nest. A viewing window between the door and the inside of the nest box.A stainless steel mesh liner on the bottom of the box to protect from blowfly larvae.This nest box has four features that I love which make it my top recommendation: My top bluebird house recommendation is the model CWH4 bluebird box by Nature’s Way.
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