What to do when driving from flagstaff AZ to boulder co?

When driving from Flagstaff, AZ to Boulder, CO, take I-17 North to I-40 East, then merge onto I-25 North. Enjoy the scenic views along the way, especially as you pass through the mountains. Consider stopping in towns like Williams or Colorado Springs for a break or sightseeing. Make sure your vehicle is prepared for changing weather conditions, especially in higher elevations.