There are numerous reasons your tomato leaves may be curling. As a fellow Utah gardener I would think it's likely due to too much heat without a cool-down period. The opposite is a possibility as well, if they have been in a nice heated area and the temperature drops suddenly to a cooler temperature they may curl up on themselves- this is a protective response. The same happens if they are exposed to a lot of dry weather and then a lot of water, they tend to curl up a bit.

It could be stress, too much sun, insufficient roots for the amount of sun, overwatering, lack of acclimatization, etc. Some viruses have that as a symptom. The variety might be used to a more temperate climate. I would remove the oldest leaves of the plant if I were you (although that is experimental advice to stimulate new leaf growth, which leaves might not be as prone to curling). Maybe give it some extra potassium/phosphorus, too, to help the roots (without adding extra nitrogen, unless it's already low nitrogen).

If your tomato is determinate, you may want to be more careful about removing leaves.