I wouldn't be worried if you're planning on leaving that early. It's supposed to start tonight and then carry through tomorrow all day. I would keep the road conditions open on CO Trip and play it by ear. Honestly, I'd probs be trying to catch some early Sunday POW laps and then head out. I know that's not what you asked, but I wouldn't be able to pass up fresh tracks on a pow day. Just probs plan on leaving by noon or a little before but that's all dependent on what CO Trip looks like at that point in time. 6:15 flight and getting to DIA 2 hours before would mean arriving around 4:00 - 4:15 and I'd give myself 4 hours of travel time or maybe a bit more - so yeah I think you could catch some laps and don't think you'll have an issue. At least if 70 has issues you can sneak out over Hoosier and take 285.