Adequate tires are critically important to navigating the I-70 mountain Corridor! Check your tread with the simple quarter test: Insert a quarter into the tire tread upside down, with Washington's head going in first; if the top of George's head is covered by the tread, your tires are OK. (Do this test in multiple points around each tire.) If the top of his head is visible at any point, you need new tires.
These laws apply to passenger vehicles. Details are at the CDOT WinterWise page.
The AutoSock is an easy-to-install traction device that meets the requirements of the Colorado Chain Law.
Ask the rental car company if the car’s tires meet the Colorado Traction Law. Better yet, perform the quarter test yourself. If you get a ticket for a violation, you are responsible for paying it, not the rental car company!