I didn't realize so many of you felt that cats should not ever be outside. Hmm...wondering how welcome I am around here with those attitudes, since 2 of my 6 cats are outdoor cats!
Here is how I feel.
I have 3 cats inside and one baby girl who is out in the garage right now recovering from a URI and waiting to be boostered and spayed before she comes inside to live (due to my old cat's health issues). My husband put his foot down and said that 4 inside cats is ENOUGH!
About a month later, I walked into a kill shelter and met a momma and her baby. She was emaciated from nursing a kitten who had been weaned. Her kitten was so scared of people that they shelter was ready to put him down for being "anti-social" at a whopping 8 weeks old! I opened the momma's cage (baby was in there with her) and she fell, literally, into my arms. She was too weak to do much more than purr gently and lay there. I cried. The next morning, I took momma kitty and her baby, Percy, home with me. I set them up in my garage with food, water, beds, and a really nice enclosure for the kitten so he could stop nursing and momma could recover from her spay (she was sent off to be spayed when I filled out the adoption paperwork). I nursed them both back to health - fed them all they wanted and took care of them. When momma felt better, she started pawing at the windows and the door. She would run out of the garage when we opened it up and I would have to catch her to put her back in. Finally, I let her go out. She found the barn and was just in cat heaven!
I have now had momma and Percy for just over 2 months and both of them are healthy, happy, playful outdoor kitties. They spend their days in the barn, climbing the trees on our 60 acre property, and momma fiercely defends her "territory" by running off every bunny and chicken she sees.

At night, they come back to the garage for food, water, a litter box, and their beds. I lock them in there at night (when the real predatory dangers exist here). I don't know what winter will bring for these two cats...but for now, I know that what they have here - with the love and life we give them and the freedom they have to be CATS - is better than the death they would have had at the shelter. Their time was almost up.
I also have to say that Momma and Percy are much more healthy and active than my indoor cats. My indoor cats are a bit overweight (with the exception of Blue and the new girl, Juno) and they mostly sleep and eat. Rex and Chloe are only just over a year old and they are lazy lumps. They play with each other for about 30mnutes a day and then they sleep the rest. Momma (who is also just about a year old) and Percy are always out and about...running, playing, climbing, and being active.
ETA: Our garage is attached to our house with a door leading inside...so don't think greasy nasty detached garage with cats locked in it, please. LOL