Having gotten a horned lizard/toad...
You need to get him out now so he can get his weight up for hibernating during the winter.
You may not know when to lower the temps or raise them for winter/spring.
I can't release mine as I am in WI. and I can't get her sent to a rescue due to the need for next day shipping that can't seem to happen for less than 50 plus dollars...
Carol