The Old faithful Geyser is the world's most renowned geyser which is a must-see for every Yellowstone visitor. Although it isn't the largest geyser in the world, Old Faithful's eruptions are definitely awe-inspiring, averaging around 130 feet high and at times clearing 180 feet.
Like its name suggests, you can count on Old Faithful erupting approximately every hour and a half (the nearby visitors center can provide you with a more accurate schedule).
There are several ways to see Old Faithful's power: you can join the crowds of tourists who gather around the perimeter or find a less hectic spot in the dining room of the nearby Old Faithful Inn, a rustic log hotel constructed during the winter of 1903.
Old faithful Geyser More adventurous travelers can enjoy the mile-long hike out to Observation Point for a bird's-eye view of the Upper Geyser Basin.
Old Faithful is located in Geyser Country a little west of Yellowstone Lake (easily accessible from the West Entrance). Surrounding Old Faithful are several hotels, dining areas and a visitors center. Keep in mind most of Old Faithful's facilities generally open in May and close between September and November, so plan your trip accordingly.
Check the National Park Service's Old Faithful area page for specific opening and closing dates of facilities, operating hours, current weather conditions and road related delays.