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 |
|---|---|
| Great Fountain |  17:43 ± 2 hours |
| Great Fountain |  18:00 ± 2 hours |
| Riverside | 18:50 ± 45 minutes |
| Riverside | 18:47 ± 25 minutes |
| Grand | 21:12 ± 105 minutes |
| Grand | 21:00 ± 90 minutes |
| Castle | Jul 27 @ 06:00 ± 45 minutes |
| Castle | Jul 27 @ 06:08 ± 1 hour |
| Old Faithful | 20:11 ± 10 minutes |
| Daisy | 20:42 ± 15 minutes |
| Daisy | 20:25 ± 10 minutes |
Predictions courtesy of:
GeyserTimes National Park Service (*) Prediction derived from double interval