Just as an FYI, I-70 through Glenwood Canyon should be good to go at this point. We've had some light rains that have helped to settle the ash and loose debris as well as knock the fire down. We've had several days straight now with little to no smoke in the valleys adjacent to the fire etc. If we get a hard rain there likely will be temporary closures for mudslides but again that's not expected to be the norm. Containment lines are getting reinforced daily and they've had 2 days of no new growth on the Grizzly Fire.
The Pine Gulch fire is enough north of I-70 that it was never really an issue for travel just heavy smoke, that fire is also currently looking like it's about done too.
Weather can change these conditions in a matter of hours or minutes but I wouldn't plan on driving hours out of your way to avoid Glenwood Canyon at this time.