A wobbling PVC baffle will deter many climbing mammals, but an 8' metal stovepipe baffle topped with hardware cloth will deter both climbing mammals and snakes. |
If you mount a nestbox on a tree, large wooden post, fence or telephone pole with no guard, be prepared to lose adults, eggs and nestlings to raccoons, snakes or cats. Just because you don't have predation the first year doesn't mean they are safe - e.g., sometimes it can take raccoons 3-4 years to find the location of a 'Happy Meal.'
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See Comparing Pros and Cons of Various Predator Guard Styles.
Either a Stovepipe (Kingston) or PVCwobbling baffle will guard your nestbox against climbing predators like raccoons and cats. It will also deter squirrels, chipmunks, mice, and rats as long as they cannot otherwise jump to the box. The slicker the better. (Note: some raccoons can climb up a 4' diameter pipe, especially if they are really hungry.)

For snakes, space or distance are needed between the center pipe used for mounting the nestbox, and the surrounding baffle. This allows the snake to go up inside the baffle. On Purple Martin structures mounted on 3'x3' steel square tubing, you can use an elevated, inverted 38 gallon trash can as a baffle.
An 8' stovepipe guard also deters snakes. A small (4') diameter PVC one does not, as snakes (esp. Black Rat Snakes) may be able to coil around it, even when greased. They might even be able to get past a 4-6' diameter metal stopvepipe, so Ron Kingston (the inventory of the Kingston baffle) recommends an 8' or larger diameter metal stovepipe.
Raccoons have been known to get around metal cone guards on poles, even those that are 36' in diameter. That size conical baffle may not stop snakes over 5 feet long, which thank goodness are not a problem in CT. Conical baffles are fairly easy to make and are good for nestboxes mounted on wooden posts. See more information on deterring cats and snakes.

A 4 foot wide flat square of hardware cloth also works, but it makes monitoring difficult, has sharp edges, and is expensive.
Another option is a Noel Guard which MAY (or may not) deter raccoons, cats and squirrels, but not snakes or medium sized avian predators. It is a little wire cage (1/2' hardware cloth) that goes over the nestbox entrance hole.
Hardware cloth is not fun to work with - it's stiff and cut edges are sharp, so be patient and careful.
I recommend mounting a nestbox on a metal pipe (EMT electrical conduit - 1/2' for light boxes, 3/4 - 1' for heavier boxes). I put a wine cork in the top of the pipe so water doesn't get in and freeze and split it. Some folks regularly grease EMT metal conduit poles with lithium-based automotive grease, or spray with Pledge (furniture polish) or Eureka Fluid Film to make it harder for critters to climb an unbaffled pole.
Simple plastic bucket baffle, photo by Dottie of Indiana. Remove rim of bucket with a box cutter. |
What does not work well, or is not recommended:
Use of a Bird Guardian (a commercially available plastic tube inserted into the entrance hole or screwed onto the box exterior) would provide protection against reaching predators (not snakes). However, it makes feeding more difficult and is generally not well accepted by bluebirds. Trail monitors have found that few, if any, bluebirds will use a box with a Bird Guardian on it, and some even abandon nests with eggs when a Bird Guardian is placed on a box. The instructions now indicate that it should only be used on a well established nest, and to watch after installation to verify that it is accepted. It can also create problems when opening a front opening box.
A thick hardware block placed over the entrance hole does NOT deter raccoons (or snakes). It may make it more difficult for avian predators to reach eggs.
Two short perches right under the entrance hole do not protect eggs or nestlings from cats or birds, according to Keith Kridler.
Some people wrap the pole in barbed wire, put carpet tack strips on the post (which does have a deterrent effect), or use other sharp or pointed objects, but they are dangerous to humans including children, and would not be considered humane.
No predator guard is 100% effective, but a decent one is always better than nothing!
Also see:
- Krueger Snake Trap made of garden netting
- 1/2” Conduit/Rebar Pole Mounting System (Gilbertson) - PDF file with excellent photos
Note: Some folks just use an upside-down, 5 gallon plastic paint/joint compound bucket, with the metal bail/handle removed. Drill a hole in the middle of the bucket bottom. Keep it at the right height with a hose clamp underneath (mounted on the pole), or on two wooden blocks clamped to the pole with two long deck screws. (Thanks Dan Hanan for this description.)
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