West Triplet Geyser, Geyser in Upper Geyser Basin of Yellowstone National Park, US.

West Triplet Geyser is a fountain-type geyser in the Upper Geyser Basin of Yellowstone National Park, Wyoming, 85 feet (26 m) south of Grand Geyser. It erupts to a height of about 10 feet (3 m), usually during Grand's quiet periods.

West Triplet Geyser erupted about every three hours until 1947, when that regular rhythm ended. Its eruptions now come to roughly 10 feet (3 m) and usually fall in Grand Geyser's quiet periods, often just before or after a Grand eruption; long West Triplet eruptions can delay Grand's. The link between the two is not seen every year, and in recent years West Triplet has often erupted before Rift Geyser.

West Triplet's eruptions often come just before or just after an eruption of Grand Geyser, and long eruptions can delay Grand's own. The link is not constant from year to year, and in recent years West Triplet has often erupted before Rift Geyser. Because it sits close to the boardwalk, it is easy to watch.

Marked trails through the Upper Geyser Basin lead visitors to the spring and other nearby thermal features. Follow park guidance and maintain respectful distances to keep yourself and the surroundings safe.

West Triplet sits about 85 feet (26 m) south of Grand Geyser, close to the boardwalk, so its small eruptions are easy to watch. Its activity is tied to Grand and Rift: eruptions often come just before or after Grand's, and long ones can delay Grand. In recent years its eruptions have often preceded Rift's.