The rivers and waterfalls at Yellowstone in the spring are full and raging from the snow runoff. You can see, hear and feel the power of the water as it rushes by.
The water flow is still good during a Yellowstone summer vacation. But you’ll need to pack your patience to navigate the crowds and deal with the biting bugs!
The downside to a Yellowstone in the fall is the reduced water flow in the rivers. The waterfalls don’t have the volume of water they would have during spring and early summer.
In winter, Yellowstone has a blanket of snow and you can enjoy the tranquility of the park! The only way to see most of the waterfalls is with guided tours on snowmobiles or snow coaches.