Originally Posted by Dennis_K
You will need to use UT59, AZ389 through Colorado City then use either US89A or US89 down to Flagstaff then I-40 to Winslow. I suggest using 89 and visit Lake Powell on the way.
We've done the 59/389 route many times and it's an easy drive with a big rig. You won't be going through the tunnels.
When you get to Fredonia, AZ you have the two above-mentioned choices. Head north on 89 to Page, AZ and then south on 89 to Flagstaff and I-10 east to Winslow.
Or...from Fredonia turn south to Jacob Lake (no lake by the way) and take 89A east to 89 and south on 89 to Flagstaff. On this route you'll have a short steep descent after you leave Jacob Lake. It's very doable but just wanted to warn you. Midway down is a very large pull-off on the right where you can catch your breath and admire the awesome landscape.
We've done them all! Also, while visiting Zion be sure to drive your toad up through the tunnels.... a neat experience.
Here's the park's website with maps and all you need to know. Have a good trip.