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In eruption since 2011

Today's Eruptions

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Values for Old Faithful Area2019-12-072019-12-08
Civil Twilight Begin07:1207:13
Civil Twilight End17:1617:16
Moon Illumination76.92%84.53%
Last Known Eruption
Old Faithful

195d 5h 22m ago


50d 7h 27m ago


222d 4h 0m ago


222d 14h 35m ago


185d 4h 45m ago

Great Fountain

222d 14h 16m ago


222d 19h 34m ago


225d 11h 45m ago

All data is shown in US/Mountain timezone unless specified otherwise.

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