Last Known Eruption
5h 52m ago
Predicted Next Eruption
Today at 1547 ± 60 minutes

Latest Eruptions

Eruption DurationCodeInterval
12 Apr 2024 @ 0849 ie wc---14h 38m
11 Apr 2024 @ 1811 wc~12m -3#Q7h 26m
11 Apr 2024 @ 1045 wc-1-14h 24m
10 Apr 2024 @ 2021 wc---7h 42m
10 Apr 2024 @ 1239 ie wc-1-7h 10m
10 Apr 2024 @ 0529 ns wc-1-13h 37m
09 Apr 2024 @ 1552 wc~11m -2-7h 34m
09 Apr 2024 @ 0818 ie wc-1-13h 29m
08 Apr 2024 @ 1849 ns wc-1-8h 2m
08 Apr 2024 @ 1047 wc-1-19h 46m
07 Apr 2024 @ 1501 ie wc---7h 41m
07 Apr 2024 @ 0720 wc~11m -1-14h 1m
06 Apr 2024 @ 1719 wc-1-7h 0m
06 Apr 2024 @ 1019 wc~11m -1-19h 31m
05 Apr 2024 @ 1448 ie wc-2-19h 52m
04 Apr 2024 @ 1856 wc~11m -2-6h 15m
04 Apr 2024 @ 1241 wc-2-6h 39m
04 Apr 2024 @ 0602 wc~11m -2-13h 29m
03 Apr 2024 @ 1633 ie wc---7h 29m
03 Apr 2024 @ 0904 ie wc---13h 5m
02 Apr 2024 @ 1959 ns wc-1-8h 59m
02 Apr 2024 @ 1100 ns wc-2-15h 59m
01 Apr 2024 @ 1901 wc~11m -1-7h 8m
01 Apr 2024 @ 1153 wc-1-6h 45m
01 Apr 2024 @ 0508 wc-1-15h 45m
31 Mar 2024 @ 1323 wc---20h 33m
30 Mar 2024 @ 1650 wc~10m -1-1d 1h 27m
29 Mar 2024 @ 15239:38T1C8h 11m
29 Mar 2024 @ 0712 ie wc-2-20h 29m
28 Mar 2024 @ 1043 ie wc---7h 8m
28 Mar 2024 @ 0335 wc-1-12h 53m
27 Mar 2024 @ 1442 wc-1-6h 46m
27 Mar 2024 @ 0756 wc~10m 35s -3Q7h 1m
27 Mar 2024 @ 0055 wc~11m -1-7h 15m
26 Mar 2024 @ 1740 ie wc-1-14h 48m
26 Mar 2024 @ 0252 wc-1-6h 11m
25 Mar 2024 @ 2041 wc-1-6h 31m
25 Mar 2024 @ 1410 wc---7h 7m
25 Mar 2024 @ 0703 wc-2-7h 57m
24 Mar 2024 @ 2306 ns wc---7h 39m
24 Mar 2024 @ 1527 ie wc---12h 45m
24 Mar 2024 @ 0242 wc-1-6h 51m
23 Mar 2024 @ 1951 wc-1-6h 2m
23 Mar 2024 @ 1349 wc~9m 43s -1-6h 29m
23 Mar 2024 @ 0720 wc-1C7h 24m
22 Mar 2024 @ 2356 wc-1-6h 1m
22 Mar 2024 @ 1755 wc~9m 31s -2-6h 35m
22 Mar 2024 @ 1120 ie wc---6h 8m
22 Mar 2024 @ 0512 wc~11m -1-6h 30m
21 Mar 2024 @ 2242 wc-1-9h 17m
21 Mar 2024 @ 1325 wc>10m -1-6h 39m
21 Mar 2024 @ 0646 wc~11m -1C6h 25m
21 Mar 2024 @ 0021 wc-1-6h 55m
20 Mar 2024 @ 1726 wc-2-6h 46m
20 Mar 2024 @ 1040 wc-1-6h 37m
20 Mar 2024 @ 0403 wc~11m -1-6h 22m
19 Mar 2024 @ 2141 wc-1-13h 11m
19 Mar 2024 @ 0830 A wc---7h 15m
19 Mar 2024 @ 0115 wc-1-7h 42m
18 Mar 2024 @ 1733 wc~12m 8s -1-6h 25m
18 Mar 2024 @ 1108 wc~11m -1-7h 36m
18 Mar 2024 @ 0332 wc-2-6h 37m
17 Mar 2024 @ 2055 wc-1-6h 28m
17 Mar 2024 @ 1427 wc-1-7h 36m
17 Mar 2024 @ 0651 wc-1-8h 29m
16 Mar 2024 @ 2222 wc-1-6h 44m
16 Mar 2024 @ 1538 wc-1-6h 32m
16 Mar 2024 @ 0906 ie wc---7h 14m
16 Mar 2024 @ 0152 wc~11m -1-9h 10m
15 Mar 2024 @ 1642 wc~12m 26s -1-8h 31m
15 Mar 2024 @ 0811 ie wc-1-14h 42m
14 Mar 2024 @ 1729 wc~10m -1C23h 5m
13 Mar 2024 @ 1824 wc---7h 2m
13 Mar 2024 @ 1122 wc~9m 30s -1C6h 37m
13 Mar 2024 @ 0445 A---13h 39m
12 Mar 2024 @ 1506 wc-2-7h 6m
12 Mar 2024 @ 0800 A wc---6h 24m
12 Mar 2024 @ 0136 wc---7h 57m
11 Mar 2024 @ 1739 wc-1-6h 40m
11 Mar 2024 @ 1059 wc~11m -2-6h 44m
11 Mar 2024 @ 0415 A wc---9h 8m
10 Mar 2024 @ 1907 wc---6h 36m
10 Mar 2024 @ 1231 wc-2*-21h 9m
09 Mar 2024 @ 1422 wcG2Q7h 58m
09 Mar 2024 @ 0624 ? ie wc---17h 33m
08 Mar 2024 @ 1251 wc---6h 47m
08 Mar 2024 @ 0604 wc-2-15h 13m
07 Mar 2024 @ 1451 wc-1-6h 27m
07 Mar 2024 @ 0824 wc-1-8h 39m
06 Mar 2024 @ 2345 A---17h 21m
06 Mar 2024 @ 0624 wc~11m -1-21h 56m
05 Mar 2024 @ 0828 wc---13h 51m
04 Mar 2024 @ 1837 ? ie wc---8h 15m
04 Mar 2024 @ 1022~10m T1-6h 52m
04 Mar 2024 @ 0330 A---13h 30m
03 Mar 2024 @ 1400 wc-2-6h 2m
03 Mar 2024 @ 0758 wc~10m -1-13h 59m
02 Mar 2024 @ 1759 wc~11m -1-7h 44m
02 Mar 2024 @ 1015 A---6h 45m
02 Mar 2024 @ 0330 A---13h 15m

Interval Statistics

Interval Count100
Min6h 1m
Max1d 1h 27m
Mean10h 0m
Median7h 36m
Grand-Specific
Start2T/1G (66.67% T)
Max Bursts3
Mean Bursts1.29
Median Bursts1
End5C/3Q (62.5% C)

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
33890 20 Jan 2024 @ 0711 --- K.Cooper empty
33879 19 Jan 2024 @ 0816 --- K.Cooper water is there, but low
33867 18 Jan 2024 @ 0745 --- K.Cooper pool decently high and overflowing
33796 15 Jan 2024 @ 0815 --- K.Cooper a few inches below overflow
33737 03 Jan 2024 @ 1105 --- mhvogel Grand erupted early this morning not too long before the post with question mark attached.
33371 22 Dec 2023 @ 1435 --- Pholli pool completely empty
33368 22 Dec 2023 @ 1005 --- aferrara pool low, no eruption since last night's as of this time. Economic in heavy overflow
28939 21 Oct 2023 @ 0731 --- User34 Nearing first overflow
28601 01 Oct 2023 @ 0709 --- NihonRanger Pool is nice and full, doing a good amount of overflow. Small ripple waves, nothing big yet.
28509 27 Sep 2023 @ 1103 --- Brian Rift off
28138 09 Sep 2023 @ 0905 --- SteveO Reached overflow.
28128 09 Sep 2023 @ 0636 --- K.Cooper Pool empty
28075 07 Sep 2023 @ 0627 --- SteveO Not in overflow yet.
28026 05 Sep 2023 @ 0757 --- JimS First overflow from pool
27800 27 Aug 2023 @ 0644 --- JimS Pool still below overflow
27770 25 Aug 2023 @ 0652 --- JimS Slight amount of water in pool. Vent and Turban quiet
27696 20 Aug 2023 @ 0622 --- JimS Already in overflow
27679 19 Aug 2023 @ 0610 --- JimS Already in overflow
27651 17 Aug 2023 @ 0627 --- JimS Already in overflow
27514 11 Aug 2023 @ 0603 --- JimS Pool empty, Turban ie, Vent quiet
27501 10 Aug 2023 @ 1622 --- minissa Some interesting afterbhrst activity started around 1610. Vigorous Vent and Turban, Grand erupting from empty pool intermittently to as high as 12 feet. Eruption was recorded as a Q, so this caught our attention. Noticed from over by Spasmodic.
27485 10 Aug 2023 @ 0619 --- JimS Already in overflow
27469 09 Aug 2023 @ 0609 --- JimS Pool below overflow
27450 07 Aug 2023 @ 0626 --- JimS Pool empty, Turban and Vent quiet
27395 03 Aug 2023 @ 0610 --- JimS Pool empty, Turban and Vent quiet
27343 30 Jul 2023 @ 1828 --- RVD Grand intermittently "erupting" from an empty pool, with some spritzy bursts matching the height of Vent Geyser which continues to go strong. Turban continues to also have strong eruptions and the Triplet has joined in. I have not seen this before. This is roughly half an hour after the main eruption (which i did not see). Stayed at Grand for almost 10 minutes to watch.
27273 28 Jul 2023 @ 0533 --- JimS Pool empty, Turban and Vent ie
27249 27 Jul 2023 @ 0611 --- JimS Already in overflow
27208 25 Jul 2023 @ 0609 --- JimS Already in overflow
27189 24 Jul 2023 @ 0608 --- JimS Already in overflow
27137 21 Jul 2023 @ 0617 --- JimS Already in overflow
27129 20 Jul 2023 @ 0602 --- JimS Pool empty, Turban and Vent quiet
27080 16 Jul 2023 @ 0553 --- JimS Pool empty, Turban and Vent quiet
27060 14 Jul 2023 @ 0508 --- dandersen Pool Empty
27043 13 Jul 2023 @ 0540 --- JimS Pool empty, Turban and Vent quiet
26999 11 Jul 2023 @ 0525 --- JimS Pool empty, Turban and Vent quiet.
26875 07 Jul 2023 @ 0544 --- JimS Already in overflow
26859 06 Jul 2023 @ 0533 --- JimS Already in overflow
26813 04 Jul 2023 @ 0549 --- JimS Already in overflow
26689 27 Jun 2023 @ 0536 --- JimS Pool empty, Turban and Vent quiet
26655 25 Jun 2023 @ 0543 --- JimS Already in overflow
26630 24 Jun 2023 @ 0539 --- JimS Already in overflow
26581 22 Jun 2023 @ 0533 --- JimS Already in overflow
26554 21 Jun 2023 @ 0537 --- JimS Already in overflow
26484 20 Jun 2023 @ 0538 --- JimS Already in overflow
26452 19 Jun 2023 @ 0540 --- JimS Already in overflow
26433 18 Jun 2023 @ 0549 --- JimS Pool empty, Vent quiet, Turban came on at 0552
26352 16 Jun 2023 @ 0632 --- JimS First overflow from pool, implying last eruption was about 0230.
26327 15 Jun 2023 @ 0547 --- JimS Water visible in the pool. Turban and Vent quiet.
26261 12 Jun 2023 @ 0730 --- JimS First overflow from the pool, implying eruption about 0330.
26256 12 Jun 2023 @ 0610 --- JimS Water visible in the pool
26205 10 Jun 2023 @ 0602 --- JimS Pool nearly empty, Turban and Vent quiet
26178 09 Jun 2023 @ 0606 --- JimS Pool is in overflow.
26147 08 Jun 2023 @ 0658 --- JimS Start of overflow from pool. Implies last eruption was about 0300.
25998 04 Jun 2023 @ 0628 --- JimS First water visible in pool meaning it's last eruption was probably about 0430.
25994 04 Jun 2023 @ 0530 --- K.Cooper empty
25968 02 Jun 2023 @ 1729 --- TSBryan Grand splashed, rested, splashed again with moderate waves, then dropped. Turban at 24 minutes.
25957 02 Jun 2023 @ 0639 --- JimS 1st visible water came into the pool. usually comes about 2 hours after eruption
25878 29 May 2023 @ 0550 --- JimS Pool empty.
25810 27 May 2023 @ 0600 --- JimS Just a small amount of water in the pool. Turban and Vent quiet.
25448 15 May 2023 @ 0846 --- RLJones Post eruptive at 0842 with Vent and Tuban continuing. They stopped at 0845.
25452 14 May 2023 @ 1735 --- SantaFe108 Huge afterplay, bursting up to 40 feet out of an empty pool.
24971 02 Feb 2023 @ 1340 --- mhvogel Electronic time is from Bluetooth logger located in grand runoff channel. The electronic time has nothing to do with telemetered loggers. I thought Bluetooth was toast as the the last time I tried to connect to the logger, it failed.
24865 11 Jan 2023 @ 0734 --- Graham Turban and Vent ie.
24609 01 Nov 2022 @ 1020 --- mhreed Water several centimeters below overflow; no first overflow yet.
24118 26 Sep 2022 @ 1415 26 Sep 2022 @ 1422 Brian Walked up to Geyser approximately 1410, noted period of sustained heavy overflow starting at 1415 and ending shortly before turban at 1423. no knowledge of when prior Turban was, but this behaved like a delay interval.
23535 02 Sep 2022 @ 0635 --- Suzanne Pool empty.
23455 28 Aug 2022 @ 0624 --- JimS Pool empty. Turban and Vent quiet.
23407 26 Aug 2022 @ 0619 --- JimS Pool empty. Turban and Vent quiet
23379 24 Aug 2022 @ 0617 --- JimS Pool empty. Turban and Vent Quiet.
23170 14 Aug 2022 @ 0605 --- JimS Pool empty. Turban and Vent ie.
23001 03 Aug 2022 @ 0606 --- JimS Pool empty. Turban and Vent Quiet.
22925 29 Jul 2022 @ 0545 --- JimS No eruption yet
22903 28 Jul 2022 @ 0604 --- JimS Could see some water in the pool. Maybe not the first water.
22902 28 Jul 2022 @ 0545 --- JimS Pool empty, Turban and Vent quiet.
22869 26 Jul 2022 @ 0543 --- JimS Pool in overflow
22834 25 Jul 2022 @ 0602 --- JimS First overflow from pool.
22801 23 Jul 2022 @ 0634 --- JimS First water visible in the pool.
22799 23 Jul 2022 @ 0542 --- JimS Pool empty. Turban and Vent quiet.
22770 22 Jul 2022 @ 0548 --- JimS Pool empty, no water visible, Turban and Vent quiet.
22693 19 Jul 2022 @ 1221 --- JimS 1st overflow
22687 19 Jul 2022 @ 0536 --- JimS Appears to be start of overflow.
22709 19 Jul 2022 @ 0431 --- jluesse No eruption yet. Out of NPS prediction. Still shows some promise.
22429 09 Jul 2022 @ 1308 --- hkoenig First ovfl
22346 06 Jul 2022 @ 0531 --- JimS Pool empty
22294 03 Jul 2022 @ 0541 --- JimS Pool empty
22108 25 Jun 2022 @ 0750 --- K.Cooper overflow just starting
22106 25 Jun 2022 @ 0547 --- JimS Pool empty
21597 31 May 2022 @ 1202 --- Stephen_Gemar The Emperor called “Waves on Grand,” but it did not erupt, which resulted in a Turban Delay.
20896 22 Mar 2022 @ 1641 --- JarnoO (wc) Appears to be post-eruptive based on constant steam from Vent and Turban area when cam panned downbasin after Old Faithful. Interval likely over 9 hours.
20828 18 Feb 2022 @ 0900 18 Feb 2022 @ 0905 aferrara Water level about 5 inches below full. Logger shows no eruption since 0032 this morning. Rapidly filling as of 0905.
19499 12 Sep 2021 @ 0630 --- Graham Empty. gently steaming.
18871 09 Aug 2021 @ 0604 --- JimS Pool empty.
18863 08 Aug 2021 @ 0709 --- JimS Overflow from pool just starting at 0709. Agrees with an eruption around 3 AM.
18559 21 Jul 2021 @ 0702 --- SteveO 1st overflow.
18540 20 Jul 2021 @ 0556 --- JimS Pool well below overflow.
18464 17 Jul 2021 @ 0535 --- SteveO Grand is quiet and empty.
18360 11 Jul 2021 @ 1310 --- User34 First overflow around this time
18196 30 Jun 2021 @ 0538 --- JimS Pool empty and Turban and Vent quiet. Post eruptive.
18079 25 Jun 2021 @ 0537 --- JimS Pool empty and Turban and Vent quiet. Post eruptive.
EntrySourceLinkComment
10 Jul 1995 @ 1319 mhreed https://www.youtube.com/watch?v=R7Ie05P2Sgc David Schwarz video of this eruption.
07 Jan 2023 @ 1613 Delta4Heavy85 https://adobe.ly/3GsvpVV Grand's eruption from the webcams view.
04 Jan 2023 @ 1237 Delta4Heavy85 https://adobe.ly/3jZ7UfI Video of eruption from the Webcam's view
25 Nov 2022 @ 2318 Art-P https://www.youtube.com/watch?v=Q0hVAQ7RK54 GRAND video
17 May 2021 @ 0059 JoeN https://i.imgur.com/ZgC53Oh.png Grand 0059
04 Aug 2020 @ 1933 JSJ https://www.youtube.com/watch?v=wOTjWdGdOEY Video compilation showing Grand Geyser's 7:33 to 7:43 PM eruption on 4 August 2020.
06 Aug 2020 @ 1442 JSJ https://www.flickr.com/photos/jsjgeology/50213109327 Photo (out of 4) of Grand Geyser's 2:42 to 2:52 PM eruption on 6 August 2020.
25 Jul 2020 @ 1132 JSJ https://www.youtube.com/watch?v=cF1okeFGEbU Video of eruption.
02 May 2020 @ 2056 JoeN https://youtu.be/9bkNZP7Op8w 3 burst Grand
04 Apr 2020 @ 0934 JoeN https://youtu.be/-8WXc68IOd8 grand video
17 Mar 2020 @ 0915 ltgangi https://youtu.be/-yHg1pz44AY grand 03/17/2010
28 Feb 2020 @ 1219 JarnoO https://www.youtube.com/watch?v=gFsg-peggKo The video of this eruption.
18 Feb 2020 @ 1157 JarnoO https://www.youtube.com/watch?v=swxz4PHVB8w The eruption as seen from the webcam.
07 Jun 2018 @ 0713 JSJ https://www.flickr.com/photos/jsjgeology/41267057880 Photo (out of 3) of Grand Geyser's 7:13 to 7:25 AM eruption on 7 June 2018.
31 Jul 2017 @ 1608 JSJ https://www.youtube.com/watch?v=PVKlUye_S8A Time lapse video of Grand Geyser's afternoon eruption on 31 July 2017.
31 Jul 2017 @ 1608 JSJ https://www.flickr.com/photos/jsjgeology/35790098193 Photo (out of 6) of Grand Geyser's 4:08 to 4:20 PM eruption on 31 July 2017.
08 Jun 2016 @ 1409 JSJ https://www.flickr.com/photos/jsjgeology/31182392056 Thermal image (1 of 8) of Grand Geyser's 2:09 to 2:20 PM eruption on 8 June 2016.
08 Jun 2016 @ 1409 JSJ https://www.flickr.com/photos/jsjgeology/31182537916 Photo (1 of 12) of Grand Geyser's 2:09 to 2:20 PM eruption on 8 June 2016.
11 Aug 2016 @ 1454 JSJ https://www.flickr.com/photos/jsjgeology/29895281572 Photo (1 of 12) of Grand Geyser's 2:54 to 3:06 PM eruption on 11 August 2016.
15 Aug 2015 @ 1057 JSJ https://www.youtube.com/watch?v=5oFebRTTHA4#t=13m58s Clips 27-31 of this video compilation (time stamp 13:58 to the end) show Grand Geyser's 10:57 to 11:09 AM eruption on 15 August 2015.
BaselineDistance (ft)Description
South Side 200Jugwalk south of Grand at the Y junction at Belgian Pool