Denver Dennis
ddkreiter@aol.com
I-76 and I-70 is more likely to be closed East of Denver to the state line. I know a woman who has gone sking every weekend for years with no problems. She is currently driving a Honda Prelude with street tires and no chains. Of course you could get stuck between the Eisenhower Tunnel and Vail pass for a couple of days until they get the avalanches plowed out. Take standard Illinois winter driving precautions; warm clothes, extra food and fluids, shovel, tow strap, blankets, full fuel tank, candles, a credit card for Vail, etc.
If the roads and weather are good, you could go over Loveland Pass for a real winter driving experience.
Good Luck