Last Known Eruption
8h 44m ago
Predicted Next Eruption
Today at 2107 ± 120 minutes

Latest Eruptions

Eruption DurationInterval
13 Jun 2021 @ 095223h 7m
12 Jun 2021 @ 104523h 56m
11 Jun 2021 @ 104922h 13m
10 Jun 2021 @ 123615h 38m
09 Jun 2021 @ 205811h 1m
09 Jun 2021 @ 095712h 53m
08 Jun 2021 @ 2104p012h 48m
08 Jun 2021 @ 081612h 45m
07 Jun 2021 @ 193112h 47m
07 Jun 2021 @ 064412h 50m
06 Jun 2021 @ 175410h 20m
06 Jun 2021 @ 073412h 48m
05 Jun 2021 @ 184617h 32m
05 Jun 2021 @ 011412h 53m
04 Jun 2021 @ 1221 E10h 23m
04 Jun 2021 @ 0158 E12h 40m
03 Jun 2021 @ 131814h 15m
02 Jun 2021 @ 2303 E12h 2m
02 Jun 2021 @ 110112h 16m
01 Jun 2021 @ 224512h 34m
01 Jun 2021 @ 1011 E8h 59m
01 Jun 2021 @ 0112 E11h 20m
31 May 2021 @ 135211h 22m
31 May 2021 @ 0230 E11h 0m
30 May 2021 @ 15309h 7m
30 May 2021 @ 062312h 10m
29 May 2021 @ 181310h 49m
29 May 2021 @ 07249h 58m
28 May 2021 @ 212610h 45m
28 May 2021 @ 10411d 9m
27 May 2021 @ 1032 ie12h 55m
26 May 2021 @ 2137 ie11d 10h 17m
15 May 2021 @ 1120 ie23h 42m
14 May 2021 @ 1138 ie19d 2m
25 Apr 2021 @ 1136 ie45d 18h 44m
10 Mar 2021 @ 1552 ie28d 31m
10 Feb 2021 @ 152111h 43m
10 Feb 2021 @ 0338 E10h 26m
09 Feb 2021 @ 1712 E9h 46m
09 Feb 2021 @ 0726 E10h 49m
08 Feb 2021 @ 2037 E13h 29m
08 Feb 2021 @ 0708 E9h 42m
07 Feb 2021 @ 2126 E16h 24m
07 Feb 2021 @ 0502 E13h 12m
06 Feb 2021 @ 1550 E9h 26m
06 Feb 2021 @ 0624 E11h 12m
05 Feb 2021 @ 1912 E10h 15m
05 Feb 2021 @ 0857 E9h 40m
04 Feb 2021 @ 2317 E9h 31m
04 Feb 2021 @ 1346 E12h 6m
04 Feb 2021 @ 0140 E10h 0m
03 Feb 2021 @ 1540 E12h 20m
03 Feb 2021 @ 0320 E13h 44m
02 Feb 2021 @ 1336 E10h 18m
02 Feb 2021 @ 0318 E11h 7m
01 Feb 2021 @ 1611 E10h 33m
01 Feb 2021 @ 0538 E13h 11m
31 Jan 2021 @ 1627 E9h 46m
31 Jan 2021 @ 0641 E12h 56m
30 Jan 2021 @ 1745 E13h 42m
30 Jan 2021 @ 0403 E12h 7m
29 Jan 2021 @ 1556 E10h 2m
29 Jan 2021 @ 0554 E10h 35m
28 Jan 2021 @ 1919 E9h 27m
28 Jan 2021 @ 0952 E13h 29m
27 Jan 2021 @ 2023 E11h 31m
27 Jan 2021 @ 0852 E10h 57m
26 Jan 2021 @ 2155 E16h 36m
26 Jan 2021 @ 0519 E9h 7m
25 Jan 2021 @ 2012 E11h 7m
25 Jan 2021 @ 0905 E12h 54m
24 Jan 2021 @ 2011 E9h 18m
24 Jan 2021 @ 1053 E9h 56m
24 Jan 2021 @ 0057 E11h 33m
23 Jan 2021 @ 1324 E10h 59m
23 Jan 2021 @ 0225 E10h 16m
22 Jan 2021 @ 1609 E14h 5m
22 Jan 2021 @ 0204 E11h 12m
21 Jan 2021 @ 1452 E10h 51m
21 Jan 2021 @ 0401 E10h 10m
20 Jan 2021 @ 1751 E10h 31m
20 Jan 2021 @ 0720 E9h 7m
19 Jan 2021 @ 2213 E11h 9m
19 Jan 2021 @ 1104 E11h 50m
18 Jan 2021 @ 2314 E11h 58m
18 Jan 2021 @ 1116 E8h 52m
18 Jan 2021 @ 0224 E12h 59m
17 Jan 2021 @ 1325 E9h 37m
17 Jan 2021 @ 0348 E9h 22m
16 Jan 2021 @ 1826 E10h 33m
16 Jan 2021 @ 0753 E12h 50m
15 Jan 2021 @ 1903 E12h 20m
15 Jan 2021 @ 0643 E10h 35m
14 Jan 2021 @ 2008 E11h 28m
14 Jan 2021 @ 0840 E11h 48m
13 Jan 2021 @ 2052 E12h 15m
13 Jan 2021 @ 0837 E11h 8m
12 Jan 2021 @ 2129 E10h 1m
12 Jan 2021 @ 1128 E10h 51m
12 Jan 2021 @ 0037 E10h 7m

Interval Statistics

Interval Count100
Min8h 52m
Max45d 18h 44m
Mean1d 12h 39m
Median11h 25m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
17634 09 Jun 2021 @ 1940 --- CraigC start of overflow
17563 08 Jun 2021 @ 0545 --- CraigC not in overflow
17514 06 Jun 2021 @ 1914 --- CraigC 4 strong series, 5th very weak nothing over 10 feet. 3rd had 3 amazing pops near beginning
17500 05 Jun 2021 @ 2120 --- User34 Post-eruptive, boiling low pool
17487 05 Jun 2021 @ 1625 --- Graham Still well below overflow.
17396 02 Jun 2021 @ 2115 --- Micah Kipple Crashed several inches. Still aways from ovf unless it has a quick recovery.
17363 01 Jun 2021 @ 2137 --- am Start of overflow
17323 31 May 2021 @ 1352 --- JSJ Inclinometer reading: highest water during Great Fountain Geyser's 1st series = ~89 feet.
17324 31 May 2021 @ 1324 --- JSJ Great Fountain's pre-eruption overflow reached Prawn Geyser's vent.
17313 31 May 2021 @ 1234 --- LynnS Overflow
17286 30 May 2021 @ 1455 --- LynnS Audible overflow ie
17285 30 May 2021 @ 0530 --- LynnS In overflow
17255 29 May 2021 @ 1648 --- LynnS Start of overflow
17254 29 May 2021 @ 0610 --- LynnS Start of overflow
17253 29 May 2021 @ 0530 --- LynnS Start of what turned out to be a false overflow; duration of overflow = 9 minutes. Followed by a crash in water level.
17229 28 May 2021 @ 0920 --- Barbara Lasseter overflow began
16422 14 Oct 2020 @ 1120 --- am Heavy overflow
16385 10 Oct 2020 @ 0743 --- steve No eruption yet this morning.
16382 09 Oct 2020 @ 1830 --- Art Pool full with visible boil up to 1-2’ from the south end of pool. Visitors stated no eruption since they had been observing (~20 minutes)
16381 09 Oct 2020 @ 1700 --- Art Still ie. Saw several large bursts with water falling outside of crater.
16379 09 Oct 2020 @ 1342 --- steve Quick rise and overflow again at 1342. This time it stayed up.
16378 09 Oct 2020 @ 1300 --- steve In overflow again at 1300 and dropped just below overflow a few minutes later. Then several minutes after that it crashed.
16377 09 Oct 2020 @ 1238 --- steve It went into overflow at 1238, but dropped out of overflow a couple of minutes later.
16332 05 Oct 2020 @ 1005 --- steve First overflow at about 1005 after a fast rise.
16329 04 Oct 2020 @ 1625 --- User34 Large crowd, low pool (couldn't tell if it was boiling or not), and still water on terraces. Not in overflow yet?
16315 01 Oct 2020 @ 1701 --- mhvogel I want to give all of the geyser enthusiasts a heads up. Beginning today, October 1, the NPS will no longer be predicting Great Fountain for the rest of the year. Half of our staff has left and we don't have enough people on our staff to go to the other basins and get geyser data. I will personally get GF and Fountain data when I have time. We will resume GF predictions beginning in May of next year. However, I will continue to post GF and Fountain E times on Geysertimes.
16288 27 Sep 2020 @ 1246 --- am In overflow when I arrived
16281 27 Sep 2020 @ 0921 --- DanS Not in overflow
15989 05 Sep 2020 @ 1640 --- jkgood Beginning of overflow
15944 03 Sep 2020 @ 1830 --- CraigC start of overflow
15902 30 Aug 2020 @ 1920 --- CraigC start of overflow. 1936 dropped, out of overflow. Back in overflow at 1942
15626 17 Aug 2020 @ 0955 --- Skippyphoto bubbling visible around rim.
15625 17 Aug 2020 @ 0950 --- Skippyphoto sound of overflow started.
15615 16 Aug 2020 @ 1948 --- CraigC start of overflow
15540 12 Aug 2020 @ 1809 --- LynnS Great Fountain start of overflow
15518 11 Aug 2020 @ 1744 --- CraigC in overflow
15151 02 Aug 2020 @ 1405 --- aferrara Nearly in overflow at 1330, water level more than 1ft below overflow when I returned at 1405
15110 26 Jul 2020 @ 1545 --- CraigC in overflow per observer
15070 21 Jul 2020 @ 1525 --- CraigC in overflow per Byron
15061 21 Jul 2020 @ 0627 --- CraigC already in overflow
15058 20 Jul 2020 @ 1822 --- William 1st overflow
15043 20 Jul 2020 @ 0650 --- CraigC 650 pool crashed, 718 in overflow
15040 19 Jul 2020 @ 1909 --- CraigC 2nd 1927 to 1932. 3rd 1941 to 1947. 4th 1956 to 2002. 5th 2009 to 2017
15039 19 Jul 2020 @ 1753 --- CraigC started overflow
14986 14 Jul 2020 @ 1715 --- CraigC already in overflow when I arrived
14965 13 Jul 2020 @ 0524 13 Jul 2020 @ 0602 LynnS From 0524 until about 0600 Great Fountain was in the post-eruptive state where it periodically splashedup water without ejecting water from the crater (coning activity that does not reflect expenditure of energy and is not included in calculations of duration based prediction models), but had not quite entered the post-eruptive state where the pool fills to a few inches below overflow, then boils for awhile (stage 1 of Tomas Vachuda’s quiet period.) About 0600 the coning started to turn to activity that looked more like boiling around the edges of and the pool level, although several inches below the rim, was visible (stage 1 of Vachuda’s quiet period).
14894 06 Jul 2020 @ 1350 --- CraigC in overflow
14889 05 Jul 2020 @ 1545 --- LynnS Already in overflow.
14879 04 Jul 2020 @ 1845 --- CraigC in overflow
14813 30 Jun 2020 @ 1305 --- User34 Seemed very close to overflow, or in early overflow
14724 24 Jun 2020 @ 1350 --- William 1st overflow
14695 20 Jun 2020 @ 0549 --- LynnS Great Fountain in very early overflow; water has not yet started trickling off the first terrace.
14657 17 Jun 2020 @ 1705 --- LynnS Not yet in overflow
14638 14 Jun 2020 @ 1542 --- aferrara Fairly high water level ~1530 dropped ~1' below overflow
14634 13 Jun 2020 @ 1645 --- William arrived to overflow with light circular boil.
14605 11 Jun 2020 @ 1957 --- William first overflow
14546 05 Jun 2020 @ 1250 --- RLJones no eruption yet as of 1250
14530 03 Jun 2020 @ 2230 --- William Still no overflow at 22:30
14236 25 May 2020 @ 1523 --- mhvogel Hey geyser enthusiasts. I went to Firehole Lake Drive this morning to retrieve the data logger eruptions times of Great Fountain. It stopped logging on April 28 so there is nearly a month of eruptions that is lost. I reconfigured the logger so as of 0940 it began logging again. I'll input the eruption times as soon as I can as it takes a long time to enter over a month's worth of data. This summer Old Faithful Park Rangers will not be predicting Great Fountain geyser. We will not be there every morning like we used to be and that's rather unfortunate. This is due to low staffing levels and operational needs. It is way beyond my control.
13952 16 Oct 2019 @ 1546 --- Maureen Firehole Lake Drive has been closed since the whole park shut down last week and has NOT reopened.
13951 16 Oct 2019 @ 1438 --- mhvogel After arduously reviewing the GF electronic data, it appears GF is going into a "wild phase". On 10/9 it was doing these small eruptions every from 0443-1622 every 20-30 minutes. On 10/10 more small eruptions every 20-30 minutes. On 10/11 and 10/12 not much of anything. On 10/13 and 10/14 GF began to have small eruptions again about every 30-60 minutes. I hope this helps.
13991 14 Oct 2019 @ 1234 --- mhvogel After reviewing the great fountain graph, the wild phase period started on 10/9 and ended on the morning/afternoon of 10/14.
13990 14 Oct 2019 @ 1224 --- mhvogel The geology department emailed me the Great Fountain electronic graph for 10/14-10/18.
13901 07 Oct 2019 @ 1042 --- underarockphoto In full overflow
13894 06 Oct 2019 @ 1120 --- cb overflow just starting on the 2nd tier.
13873 04 Oct 2019 @ 1450 --- Maureen Overflow start.
13861 04 Oct 2019 @ 0730 --- underarockphoto Five inches below overflow.
13834 30 Sep 2019 @ 1247 --- Maureen The next eruption will be after 1500.
13802 25 Sep 2019 @ 1219 --- Maureen Overflow start.
13750 19 Sep 2019 @ 0815 --- Barbara Lasseter Heavy noisy boiling in crater sometimes reaching top of crater. Runoff channels holding water
13715 16 Sep 2019 @ 0835 --- Barbara Lasseter First overflow
13709 15 Sep 2019 @ 1919 --- William first overflow
13699 15 Sep 2019 @ 0730 --- Barbara Lasseter First overflow
13677 13 Sep 2019 @ 0745 --- Barbara Lasseter 31 & foggy. No overflow. Audible boiling in the crater
13669 12 Sep 2019 @ 1544 --- Maureen Overflow start
13632 09 Sep 2019 @ 0710 --- Barbara Lasseter Mostly refilled. Still a little boiling at the edge
13626 08 Sep 2019 @ 0707 --- Barbara Lasseter First overflow
13623 07 Sep 2019 @ 2014 --- William no overflow by this time.
13585 05 Sep 2019 @ 1312 --- William first overflow
13541 04 Sep 2019 @ 1545 --- mhvogel One of co-workers told me the wrong overnight eruption time of GF. According to the Bluetooth download, the eruption time was 0440 which matches up with the dude that saw it at 0436. Sorry for the confusion.
13546 04 Sep 2019 @ 1306 --- mdschwarz Not in overflow. Parking lot full.
13496 01 Sep 2019 @ 1936 --- geysergaze Overflow 1936
13457 29 Aug 2019 @ 2029 --- steve Great Fountain was already in overflow. Start time unknown but the area of steaming water was still close to the main vent
13448 29 Aug 2019 @ 0856 --- steve First overflow, after a quick rise.
13440 28 Aug 2019 @ 0951 --- Maureen Overflow start.
13369 23 Aug 2019 @ 1840 --- Maureen Overflow start.
13360 23 Aug 2019 @ 0754 --- Maureen Overflow start.
13352 22 Aug 2019 @ 1840 --- William had not reached overflow at this time
13317 19 Aug 2019 @ 1135 --- Maureen Overflow start.
13311 18 Aug 2019 @ 1508 --- Maureen Overflow start.
13291 16 Aug 2019 @ 1634 --- William 1st overflow
13276 15 Aug 2019 @ 1812 --- William 1st overflow
13176 11 Aug 2019 @ 1945 --- minissa 1-2" from overflow, did not stay to confirm OF
13132 09 Aug 2019 @ 1356 09 Aug 2019 @ 1428 JSJ Inclinometer readings: highest water during 1st series about 81 feet; 2nd series about 59 feet; 3rd series about 45 feet.
12820 27 Jul 2019 @ 0618 --- Barbara Lasseter Overflow 0618
12560 22 Jul 2019 @ 1117 --- Barbara Lasseter Not in overflow
12521 19 Jul 2019 @ 0620 --- Barbara Lasseter Full to within 6-8inches of rim with low boil at north end
12512 18 Jul 2019 @ 0630 --- Barbara Lasseter Deep boiling with water visible only at the peak of the most vigorous boils
12500 16 Jul 2019 @ 0630 --- Barbara Lasseter Pool has refilled. Slight boil remains
12481 14 Jul 2019 @ 0750 --- Barbara Lasseter Overflow 0750
EntrySourceLinkComment
20 Sep 2020 @ 0940 JohnO https://youtu.be/sZzC-l1NQ74 Great Fountain Geyser eruption, September 20, 2020. Video composed of three clips from the first eruptive set. Eruption commenced 9:38 AM.
30 May 2018 @ 1726 EricZ https://static-geysercam-xyz.nyc3.digitaloceanspaces.com/GreatFountainGeyser.mp4 Video taken by tourist Grant Arinder
26 Jul 2017 @ 1752 JSJ https://www.flickr.com/photos/jsjgeology/36237239410 Photo (out of 10) of Great Fountain Geyser's 5:52 PM-onward eruption on 26 July 2017.
03 Jun 2017 @ 1832 JSJ https://www.flickr.com/photos/jsjgeology/34985316630 Photo (out of 9) of Great Fountain Geyser's evening eruption on 3 June 2017.
02 Jun 2017 @ 1645 JSJ https://www.flickr.com/photos/jsjgeology/35205457072 Photo (out of 7) of Great Fountain Geyser's late afternoon eruption on 2 June 2017.
02 Jun 2017 @ 1645 JSJ https://www.youtube.com/watch?v=UL1mwSjv1RY Time lapse video of Great Fountain Geyser's late afternoon eruption on 2 June 2017.
13 Aug 2016 @ 2027 JSJ https://www.youtube.com/watch?v=esB95f0I52U Time lapse video of Great Fountain Geyser's evening eruption on 13 August 2016.
13 Aug 2016 @ 2027 JSJ https://www.flickr.com/photos/jsjgeology/30109996042 Photo (1 of 7) of Great Fountain Geyser's evening eruption on 13 August 2016.
10 Aug 2016 @ 2018 JSJ https://www.flickr.com/photos/jsjgeology/30224237115 Photo (1 of 24) of Great Fountain Geyser's evening eruption on 10 August 2016.
10 Aug 2016 @ 2018 JSJ https://www.flickr.com/photos/jsjgeology/29594675523 Thermal image (1 of 3) of Great Fountain Geyser's evening eruption on 10 August 2016.
10 Aug 2016 @ 2018 JSJ https://www.youtube.com/watch?v=t4LIaXxRt0s Time lapse video of Great Fountain Geyser's evening eruption on 10 August 2016.
08 Sep 2014 @ 1505 Micah Kipple https://www.flickr.com/photos/sgplewka/15604440267 flickr
06 Sep 2014 @ 2003 Micah Kipple https://www.flickr.com/photos/wildwood4est/15368309463 flickr
13 Sep 2014 @ 1411 Micah Kipple https://www.flickr.com/photos/digbydachshund/15940278098 flickr
02 Jun 2014 @ 1303 Micah Kipple https://www.flickr.com/photos/125791209@N06/16128797716 flickr
25 Sep 2014 @ 1725 Micah Kipple https://www.flickr.com/photos/hhayk/16012608917 Flickr
24 Sep 2014 @ 1907 Micah Kipple https://www.flickr.com/photos/rtsmithcpa/15187347577 Flickr
24 Sep 2014 @ 1907 Micah Kipple https://www.flickr.com/photos/rtsmithcpa/15187166390 Flickr photo
19 Sep 2012 @ 1502 Jake http://www.youtube.com/watch?v=B3bTX5OQUEY a visitor\'s excellent video with the blue bubble at the 3 minute mark
Baseline does not exist.