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.
It's located 14 miles from the resort and is easily accessible from the gateway cities of San Francisco (SFO), Seattle (SEA), Los Angeles (LAX), Salt Lake City (SLC) and Denver (DEN-summer 2014).