Building the flock's dust bath
Dry earth, sand, and a scoop of wood ash
Chickens clean themselves with dry dirt. Give them a good place to do it and mites have nowhere to live.
Dry earth, sand, and a scoop of wood ash
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Dust bathing is how chickens keep themselves clean. They work fine dry dirt through their feathers until the excess oil, dander, and any mites or lice are scrubbed out. If you give them bare ground they will dig their own holes, usually exactly where you did not want them. Build them a better one and they will use it instead.

Anything that will hold eight or more inches of loose material works: a frame of 2x8 boards about two feet by three, an old tractor tire, or a sandbox. Put it where rain cannot reach it, under the coop overhang or in a covered corner of the run. Wet dust is mud, and hens will not bathe in mud.

Use roughly half dry native soil or peat and half coarse sand, plus a generous scoop of wood ash, about a cup or two. Ash from a stove or fire pit is fine as long as it came from clean wood only, with no charcoal briquettes and nothing painted or pressure-treated. Loosen it with a trowel occasionally and top up whatever they kick out.

Diatomaceous earth kills crawling insects, but the dust is genuinely bad for the lungs of both chickens and people, and a dust bath is a cloud of dust by definition. We leave it out of the regular mix, since wood ash handles the parasites, and keep food-grade diatomaceous earth for treating an actual infestation, applied lightly and outdoors.

A good dust bath gets used almost immediately: digging, rolling, and flinging dust down to the skin with their wings, followed by a big shake and a preen. They often bathe together and will wait their turn for the best spot. While they are lying there, take a look under their wings and around the vent, because bath time is the easiest chance you will get to check for mites.
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