Utah is on a desert like place right? I think it would be fine as long as you had a TON of space and lots of micro-climates in the enclosure. you would need a heated shed like wellington said for the winter or the nights if there gets really cold at night there.
Utah is entirely the wrong area for this species. Much too cold in winter, too hot in summer and much too dry all the time. Even here in Socal where we have temps in the 70s and 80s for parts of winter, its not the right environment for them. They need consistent high humidity and warm temps. They come from a tropical island. Ever been to Hawaii or Fiji or Tahiti, or South Florida in summer?
And a shed is nowhere near big enough to house one of these behemoths for an entire cold winter. You'd need a heated, humidified warehouse.
You'd do much better with a tortoise that is better suited to your climate, and easier to house, or hibernate, in winter.