Red ear sliders live all over the world. They have been introduced in places that freeze to places that are tropical. They thrive in Texas weather so if you keep him outside he should be fine. Just make sure he has a place to get out of the sun when he wants to. Plastic pond liner might not work because turtles have long claws. I would use a molded plastic pond from HD or Lowes. I have even used kiddie swimming pools. It's kind of late in the year to find one. Also, keep in mind that turtles can climb so what ever you use to fence him in make sure he won't escape.