Last Known Eruption
32m ago
Predicted Next Eruption
Today at 1709 ± 60 minutes

Latest Eruptions

Eruption DurationCodeInterval
22 May 2024 @ 1009 ns wc-2-6h 32m
22 May 2024 @ 0337 wc-1-6h 47m
21 May 2024 @ 205011m 15s G1Q8h 19m
21 May 2024 @ 123111m 2s G1Q6h 46m
21 May 2024 @ 0545 wc-1-6h 35m
20 May 2024 @ 2310 wc---7h 37m
20 May 2024 @ 1533 wc---6h 13m
20 May 2024 @ 0920---7h 37m
20 May 2024 @ 0143 wc-1-8h 40m
19 May 2024 @ 1703 wc---6h 33m
19 May 2024 @ 103010m 49s G1C13h 31m
18 May 2024 @ 205910m 27s T1-7h 49m
18 May 2024 @ 131010m D0/T1C6h 32m
18 May 2024 @ 0638 wc-2-7h 16m
17 May 2024 @ 2322 wc-1-7h 26m
17 May 2024 @ 1556G2Q7h 10m
17 May 2024 @ 0846 wc~10m 26s -2-10h 39m
16 May 2024 @ 2207~10m G2C6h 48m
16 May 2024 @ 1519 wc---6h 17m
16 May 2024 @ 0902 wc~8m T1C6h 15m
16 May 2024 @ 0247 wc---6h 27m
15 May 2024 @ 2020~11m G1Q6h 10m
15 May 2024 @ 1410T1C7h 50m
15 May 2024 @ 0620 wc---15h 19m
14 May 2024 @ 1501 ns-1C6h 39m
14 May 2024 @ 0822 wc-1-16h 31m
13 May 2024 @ 1551 wc11m 55s T1Q6h 59m
13 May 2024 @ 0852T1Q12h 52m
12 May 2024 @ 2000 wc~12m 20s G3*#Q6h 38m
12 May 2024 @ 13229m 39s D0/T1C6h 38m
12 May 2024 @ 0644 wc---7h 5m
11 May 2024 @ 233910m 22s G1C7h 4m
11 May 2024 @ 1635G2C6h 19m
11 May 2024 @ 1016G1Q7h 41m
11 May 2024 @ 0235 wc---6h 50m
10 May 2024 @ 19458m 36s G1C6h 30m
10 May 2024 @ 131510m G1-7h 30m
10 May 2024 @ 0545 A---7h 46m
09 May 2024 @ 2159 wc---7h 27m
09 May 2024 @ 1432 ie---22h 17m
08 May 2024 @ 1615 A wc---8h 20m
08 May 2024 @ 0755 wc-1-13h 26m
07 May 2024 @ 1829 ie---7h 29m
07 May 2024 @ 1100 A---14h 14m
06 May 2024 @ 2046~11.5m T1C6h 26m
06 May 2024 @ 1420~10m T1C6h 36m
06 May 2024 @ 0744 wc~10m 30s T1Q13h 45m
05 May 2024 @ 175911m 6s ---7h 18m
05 May 2024 @ 104111m 32s G1C14h 52m
04 May 2024 @ 1949G1Q6h 13m
04 May 2024 @ 1336~10m 15s G1-6h 37m
04 May 2024 @ 0659 ie wc---13h 6m
03 May 2024 @ 1753 wc~10m 25s G1Q6h 39m
03 May 2024 @ 1114 wc~12m 40s T1C13h 53m
02 May 2024 @ 21219:19G2C6h 55m
02 May 2024 @ 142610m 21s T2Q7h 1m
02 May 2024 @ 0725 A wc---7h 3m
02 May 2024 @ 0022 wc---6h 24m
01 May 2024 @ 1758~10m D0/G2Q6h 34m
01 May 2024 @ 112412m 2s G1Q6h 26m
01 May 2024 @ 0458 wc-1-14h 2m
30 Apr 2024 @ 1456 wc~10m 55s T1Q8h 22m
30 Apr 2024 @ 0634 ie wc---14h 27m
29 Apr 2024 @ 160710m 33s G2Q6h 26m
29 Apr 2024 @ 0941---6h 37m
29 Apr 2024 @ 0304 wc---6h 35m
28 Apr 2024 @ 2029 wc---6h 23m
28 Apr 2024 @ 1406G1-6h 25m
28 Apr 2024 @ 0741 wc~10m T1C14h 47m
27 Apr 2024 @ 1654~10m G2C6h 40m
27 Apr 2024 @ 1014 wc~11m 20s G2Q19h 31m
26 Apr 2024 @ 1443 wc~11m 5s G2Q6h 11m
26 Apr 2024 @ 0832 ie wc---13h 25m
25 Apr 2024 @ 190711m G1Q7h 42m
25 Apr 2024 @ 1125---12h 30m
24 Apr 2024 @ 2255 wc-1-6h 17m
24 Apr 2024 @ 1638 ie wc-2-6h 23m
24 Apr 2024 @ 1015 ie---19h 52m
23 Apr 2024 @ 1423---7h 5m
23 Apr 2024 @ 0718 ie wc---6h 44m
23 Apr 2024 @ 0034 wc-2-7h 59m
22 Apr 2024 @ 163511T--7h 46m
22 Apr 2024 @ 0849 wc-2-6h 32m
22 Apr 2024 @ 0217 wc-1-6h 22m
21 Apr 2024 @ 1955 ie wc---7h 31m
21 Apr 2024 @ 122411m 35s T1Q6h 35m
21 Apr 2024 @ 0549 wc~11m -3-7h 25m
20 Apr 2024 @ 2224 wc~11m -4-7h 5m
20 Apr 2024 @ 1519G1Q6h 39m
20 Apr 2024 @ 0840 ie wc---6h 54m
20 Apr 2024 @ 0146 wc-1-6h 26m
19 Apr 2024 @ 1920~10m T1Q7h 37m
19 Apr 2024 @ 1143G1C7h 0m
19 Apr 2024 @ 0443 wc-1-6h 58m
18 Apr 2024 @ 2145 wc~11m -1-7h 35m
18 Apr 2024 @ 1410 wc>11m -1-6h 45m
18 Apr 2024 @ 0725 ie wc---6h 57m
18 Apr 2024 @ 0028 ns wc---7h 10m
17 Apr 2024 @ 1718 wc---20h 17m
16 Apr 2024 @ 2101 wc-1-7h 44m

Interval Statistics

Interval Count100
Min6h 10m
Max22h 17m
Mean8h 36m
Median7h 3m
Grand-Specific
Start27G/17T (61.36% G)
Max Bursts4
Mean Bursts1.34
Median Bursts1
End22Q/18C (55% Q)

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
34185 14 Apr 2024 @ 1058 --- mhreed Water dropped back into crater mouth w/ Turban start. Has been periodically boiling.
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.
EntrySourceLinkComment
20 Apr 2024 @ 2224 Joe   https://youtu.be/vIlPujViDqI 4 burst Grand
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.
BaselineDistance (ft)Description
South Side 200Jugwalk south of Grand at the Y junction at Belgian Pool