Predictions are shown in Mountain Time.
Eruptions cannot be predicted with absolute certainty and estimates are derived from user reports.
GeyserPrediction
Old FaithfulGeyserTimes 09:45 ± 13 minutes
DaisyGeyserTimes 10:29 ± 15 minutes

Predictions courtesy of:

GeyserTimes GeyserTimes
NPS National Park Service

(*) Prediction derived from double interval