Re-homing feral and outdoor cats is not as easy as physically placing them in their new outdoor home. Cats are very territorial, and if you simply place them in a new location, they will try to find their way back to where they came from, and many times they are killed in the process.
Fortunately, feral and outdoor cats can be acclimated to a new territory fairly easy and in a short amount of time.
1. Place the cat in a large cage or kennel within the building they will be calling home. A barn or outbuilding with an enclosed room is preferred, but exceptions can be made. Give the cat a small towel lined carrier with the door held open with a small bungee cord, food and water, and a litter box. Clay litter is better than clumping in this environment, as clumping litter can get wet or in the water bowl, making a sticky mess that is more difficult to clean up.
2. Clean the litter box and give fresh food and water daily. This can easily be done by closing the cat inside the carrier (the one you have bungeed open) to keep the cat safe while you are tending to its needs.
3. After 2-3 weeks, you can open the cage door and allow them full access to the room they were kept in. Food and water should be kept both inside and outside of the cage. Once the cats leave, they may never want to go back into the cage.
4. After one or two more weeks, the cats should be comfortable in their new home and should be allowed to roam freely. At that point the cage and supplies can be taken away.
5. Caring for your working cat is as easy as providing fresh food and water daily. Some barn cat caregivers keep litter pans inside their barns, but often are rarely used. Never rely on outdoor cats to sustain themselves on rodents alone, they need a nutrient rich diet to sustain a healthy life.