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Predictions are shown in Mountain Time.
Eruptions cannot be predicted with absolute certainty and estimates are derived from user reports.
Geyser
Prediction
Castle
Nov 20 @ 23:01 ± 1 hour
Grand
Nov 20 @ 23:51 ± 105 minutes
Predictions courtesy of:
GeyserTimes
National Park Service
(*)
Prediction derived from double interval