We were there last September and came in through the East side. We had been through the West side before, staying at West Yellowstone. This time we stayed at the Buffalo Bill State Park, which was nice even tho the reservoir is down about 25' from it's normal level. In September of last year, it was cool at night, but hot during the day. Unfortunately there were several fires south of Yellowstone, around Jackson, and we could not even see the Grand Tetons when we drove south from Yellowstone with our toad. We decided to head East from Cody and then south down to Thermopolis, WY and through Wind River Canyon scenic byway. This was a fantastic drive. All things considered, even if there were no fires and smoke obscuring the views, we prefer the West Yellowstone area more than the Eastern area. The drive from Cody to Yellowstone is nice but once you get to Yellowstone, you are faced with acres and acres of burned out forests.