Wild box turtles live outside year round.

Unless you are well outside your Three-toed's natural range, you should be able to house the turtle outside, assuming that you provide it with an adequate habitat which includes various options for shade, sun, a water source, cover, etc.
To give you an example, my Easterns live outside here in Central Virginia, where it gets plenty hot (over 100 on occasion), but they have plenty of shady areas in their enclosure as well as a small pond where they can beat the heat.

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• Is It a Good Idea to Keep Them Outside? - Paradon, Tue Jun 30 01:45:30 2009
• RE: Is It a Good Idea to Keep Them Outside? - StephF, Tue Jun 30 12:07:30 2009
• RE: Is It a Good Idea to Keep Them Outside? - Paradon, Wed Jul 1 00:59:20 2009
• RE: Is It a Good Idea to Keep Them Outside? - StephF, Wed Jul 1 09:50:30 2009
• RE: Is It a Good Idea to Keep Them Outside? - Moedad, Wed Jul 1 13:04:20 2009
• RE: Is It a Good Idea to Keep Them Outside? - curtis9980, Wed Jul 1 14:59:56 2009
• RE: thank you everyone...! - Paradon, Thu Jul 2 08:37:31 2009
• RE: Is It a Good Idea to Keep Them Outside? - kensopher, Thu Jul 2 07:04:35 2009
• RE: Is It a Good Idea to Keep Them Outside? - Paradon, Thu Jul 2 08:36:10 2009
• RE: Is It a Good Idea to Keep Them Outside? - kensopher, Thu Jul 2 11:00:51 2009