Last Known Eruption
12h 21m ago
Predicted Next Eruption
Today at 2217 ± 120 minutes

Latest Eruptions

Eruption DurationInterval
03 Aug 2021 @ 11029h 46m
03 Aug 2021 @ 0116 E18h 9m
02 Aug 2021 @ 0707 E11h 8m
01 Aug 2021 @ 1958:129h 15m
01 Aug 2021 @ 104311h 15m
31 Jul 2021 @ 2328 E12h 3m
31 Jul 2021 @ 112521h 5m
30 Jul 2021 @ 14201d 16m
29 Jul 2021 @ 140411h 16m
29 Jul 2021 @ 0248 ie10h 33m
28 Jul 2021 @ 161511h 5m
28 Jul 2021 @ 0510 ie1d 16h 45m
26 Jul 2021 @ 122520h 46m
25 Jul 2021 @ 15391d 1h 2m
24 Jul 2021 @ 143711h 57m
24 Jul 2021 @ 0240 A11h 32m
23 Jul 2021 @ 15081d 8h 30m
22 Jul 2021 @ 063810h 18m
21 Jul 2021 @ 202011h 35m
21 Jul 2021 @ 0845 ie10h 52m
20 Jul 2021 @ 215313h 8m
20 Jul 2021 @ 084513h 15m
19 Jul 2021 @ 193010h 8m
19 Jul 2021 @ 092222h 16m
18 Jul 2021 @ 110612h 45m
17 Jul 2021 @ 222111h 30m
17 Jul 2021 @ 10511d 4m
16 Jul 2021 @ 104723h 4m
15 Jul 2021 @ 114313h 33m
14 Jul 2021 @ 2210 A9h 47m
14 Jul 2021 @ 1223 ie21h 12m
13 Jul 2021 @ 151122h 41m
12 Jul 2021 @ 1630 A10h 51m
12 Jul 2021 @ 0539 ie22h 34m
11 Jul 2021 @ 070514h 46m
10 Jul 2021 @ 1619 ie12h 6m
10 Jul 2021 @ 0413 E11h 52m
09 Jul 2021 @ 162111h 1m
09 Jul 2021 @ 0520 E12h 11m
08 Jul 2021 @ 170913h 26m
08 Jul 2021 @ 0343 E13h 11m
07 Jul 2021 @ 143210h 31m
07 Jul 2021 @ 0401 E14h 3m
06 Jul 2021 @ 1358 E10h 48m
06 Jul 2021 @ 0310 E12h 24m
05 Jul 2021 @ 144610h 51m
05 Jul 2021 @ 0355 E12h 24m
04 Jul 2021 @ 153110h 28m
04 Jul 2021 @ 050311h 40m
03 Jul 2021 @ 172311h 28m
03 Jul 2021 @ 055510h 35m
02 Jul 2021 @ 1920 E10h 43m
02 Jul 2021 @ 083710h 42m
01 Jul 2021 @ 2155 E10h 9m
01 Jul 2021 @ 114622h 23m
30 Jun 2021 @ 132311h 23m
30 Jun 2021 @ 0200 ie11h 19m
29 Jun 2021 @ 144110h 41m
29 Jun 2021 @ 0400 ie10h 30m
28 Jun 2021 @ 173012h 5m
28 Jun 2021 @ 052511h 56m
27 Jun 2021 @ 1729 E9h 10m
27 Jun 2021 @ 081912h 11m
26 Jun 2021 @ 2008 E10h 12m
26 Jun 2021 @ 095612h 0m
25 Jun 2021 @ 2156 E10h 30m
25 Jun 2021 @ 112610h 23m
25 Jun 2021 @ 0103 E13h 10m
24 Jun 2021 @ 115315h 51m
23 Jun 2021 @ 200210h 53m
23 Jun 2021 @ 09098h 39m
23 Jun 2021 @ 0030 E12h 55m
22 Jun 2021 @ 113510h 27m
22 Jun 2021 @ 0108 E13h 1m
21 Jun 2021 @ 12078h 58m
21 Jun 2021 @ 0309 E13h 10m
20 Jun 2021 @ 135916h 19m
19 Jun 2021 @ 2140 E10h 8m
19 Jun 2021 @ 113211h 22m
19 Jun 2021 @ 0010 E10h 47m
18 Jun 2021 @ 132321h 38m
17 Jun 2021 @ 154521h 59m
16 Jun 2021 @ 174610h 33m
16 Jun 2021 @ 071313h 13m
15 Jun 2021 @ 180011h 20m
15 Jun 2021 @ 064010h 38m
14 Jun 2021 @ 200211h 40m
14 Jun 2021 @ 082211h 45m
13 Jun 2021 @ 203710h 45m
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

Interval Statistics

Interval Count100
Min8h 39m
Max1d 16h 45m
Mean13h 57m
Median11h 54m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
18815 03 Aug 2021 @ 0948 --- LynnS Start of overflow
18806 02 Aug 2021 @ 1900 02 Aug 2021 @ 1930 aferrara Water still 1' below overflow, rising very slightly over range of observation.
18773 01 Aug 2021 @ 0930 --- User34 First overflow
18759 31 Jul 2021 @ 1006 --- LynnS Start of overflow
18744 30 Jul 2021 @ 1302 --- LynnS Into overflow
18729 29 Jul 2021 @ 1252 --- LynnS Start of overflow
18707 28 Jul 2021 @ 1449 --- LynnS Overflow start
18706 28 Jul 2021 @ 1408 --- LynnS Overflowed briefly, then crashed
18688 27 Jul 2021 @ 1434 --- LynnS Start of overflow
18659 25 Jul 2021 @ 1424 --- LynnS Start of overflow
18655 25 Jul 2021 @ 0743 --- LynnS Still in post-eruptive audible boiling stage. Water level has dropped such that boiling is not visible while standing on the boardwalk.
18635 24 Jul 2021 @ 1324 --- LynnS Start of oberflow
18612 23 Jul 2021 @ 1403 --- LynnS Start of overflow
18611 23 Jul 2021 @ 1317 --- LynnS Pool rose close to overflow 1317 then crashed out of sight.
18610 23 Jul 2021 @ 1241 --- LynnS Pool rose to just slightly below overflow. Pool dropped several inches but did not crash 1254.
18591 22 Jul 2021 @ 1530 --- LynnS Not yet in overflow
18590 22 Jul 2021 @ 0545 --- Barbara Lasseter In overflow. Trickling over outer terrace.
18562 21 Jul 2021 @ 0605 --- Barbara Lasseter Not in overflow
18546 20 Jul 2021 @ 0701 --- steve In overflow when I pulled up but only a small amount of the first terrace is steaming. I left a minute later to check on Pink Cone so no guarantee it stayed in overflow.
18548 20 Jul 2021 @ 0615 --- Barbara Lasseter Not in overflow
18545 19 Jul 2021 @ 1814 --- steve First overflow
18498 18 Jul 2021 @ 0944 --- steve First overflow.
18497 17 Jul 2021 @ 2146 --- steve In overflow, but I didn’t stop to find out when it started
18471 17 Jul 2021 @ 0926 --- steve First overflow, prediction 1050
18448 16 Jul 2021 @ 0926 --- steve First overflow. Predicted time for Great Fountain 1050
18436 15 Jul 2021 @ 1022 --- steve First overflow
18347 11 Jul 2021 @ 0553 --- User34 In overflow
18344 10 Jul 2021 @ 1345 --- Barbara Lasseter Not yet in overflow
18147 28 Jun 2021 @ 0500 --- LynnS In audible, light boiling overflow; not in overflow at 0400
18056 23 Jun 2021 @ 0810 --- LynnS Already in overflow
17919 19 Jun 2021 @ 1030 --- LynnS Already in audible overflow
17807 15 Jun 2021 @ 0555 --- LynnS Already in overflow
17759 13 Jun 2021 @ 1943 --- William in overflow upon first observation. best guess is 10-15m into overflow.
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.
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.