Predictions are shown in Mountain Time.
Eruptions cannot be predicted with absolute certainty and estimates are derived from user reports.
Eruptions cannot be predicted with absolute certainty and estimates are derived from user reports.
| Geyser | Prediction |
|---|---|
| Grand |  19:29 ± 105 minutes |
| Grand |  19:15 ± 90 minutes |
| Castle | Dec 21 @ 04:47 ± 1 hour |
| Castle | Dec 21 @ 04:30 ± 45 minutes |
| Riverside | 21:00 ± 45 minutes |
| Riverside | 20:59 ± 25 minutes |
Predictions courtesy of:
GeyserTimes National Park Service (*) Prediction derived from double interval