Filled Water Bottle
Rain jacket and pants
Sturdy Shoes (tennies are fine)
Long Sleeved Shirt
Camera (no DSLRs)
Extra Layers of Clothing
It is best to dress in layers
Wool insulates when it is wet
Rainsuits with tops and bottoms are best
Rain ponchos are a bad idea (they scare horses, bring a jacket instead)
Cowboy boots are terrible in the rain
Chances are, the sun will shine and it will be a beautiful day, but you do not want to be unprepared in the mountains.
Be sure to check out the number one selling CD in the Park by your outfitter and guide, Jett Hitt. You can download samples of this full scale violin concerto that was inspired by the Park and recorded by the Slovak Radio Symphony. It is the perfect sound track to your Yellowstone vacation.