Predictions are shown in Mountain Time.
Eruptions cannot be predicted with absolute certainty and estimates are derived from user reports.
GeyserPrediction
Great FountainGeyserTimes 05:39 ± 2 hours
GrandGeyserTimes 03:10 ± 1 hour
RiversideGeyserTimes 03:26 ± 25 minutes

Predictions courtesy of:

GeyserTimes GeyserTimes
NPS National Park Service

(*) Prediction derived from double interval