From Toronto in mid September to Quebec City in late September, hypothetically you really could encounter everything from shorts-and-sunscreen weather to boots-and-jacket weather.
The driving distance between Denver, CO and Salt Lake City, UT is 536 miles. The driving time would be approximately 8 hours 30 minutes if driving non-stop in good conditions.
Driving distance from SLC to West Yellowstone, MT. The total driving distance from SLC to West Yellowstone, MT is 324 miles or 521 kilometers. Your trip begins at Salt Lake City International Airport in Salt Lake City, Utah.