📍Old Faithful - Yellowstone National Park Yellowstone NP is the very first national park in Wyoming. Old Faithful is a cone shape geyser that that erupts every 60-110 minutes that lasts anywhere between 1.5-10 minutes. The height of the water averages about 140 feet! The temperature of the water is predicted to be 204°f and the steam temperature is 350°f. This is definitely something to experience! #yellowstone #nationalpark #geyser #wyoming #oldfaithful