Last Known Eruption
6h 40m ago
Predicted Next Eruption
Today at 2112 ± 105 minutes

Latest Eruptions

Eruption DurationCodeInterval
26 Jul 2024 @ 1327---6h 58m
26 Jul 2024 @ 062911m 15s T1Q6h 28m
26 Jul 2024 @ 0001 A wc---7h 44m
25 Jul 2024 @ 1617 ns---6h 26m
25 Jul 2024 @ 095110m 28s G1C8h 1m
25 Jul 2024 @ 0150 wc-1-8h 4m
24 Jul 2024 @ 174610m 5s G1C7h 34m
24 Jul 2024 @ 1012 wc~12m -2-6h 34m
24 Jul 2024 @ 0338 wc-1-6h 47m
23 Jul 2024 @ 205110m G1Q6h 36m
23 Jul 2024 @ 141510m 12s G1Q7h 8m
23 Jul 2024 @ 070710m 29s G1Q6h 17m
23 Jul 2024 @ 0050 wc-1-7h 27m
22 Jul 2024 @ 1723---8h 38m
22 Jul 2024 @ 08459m D5/G1C8h 58m
21 Jul 2024 @ 23479m 12s T1C7h 16m
21 Jul 2024 @ 163110m 13s G1C9h 27m
21 Jul 2024 @ 070410m 58s T1Q8h 34m
20 Jul 2024 @ 223010m 51s G1Q6h 31m
20 Jul 2024 @ 155911m 17s D9/G1Q10h 11m
20 Jul 2024 @ 0548 wc---8h 41m
19 Jul 2024 @ 210710m 52s D0/T2C6h 32m
19 Jul 2024 @ 143511m 13s G1Q6h 45m
19 Jul 2024 @ 07509m T1Q6h 18m
19 Jul 2024 @ 0132 wc-2-6h 36m
18 Jul 2024 @ 185610m 36s G2Q6h 39m
18 Jul 2024 @ 121710m 4s G2Q6h 46m
18 Jul 2024 @ 0531 wc-1-6h 47m
17 Jul 2024 @ 224411m 37s T1Q7h 57m
17 Jul 2024 @ 144712m 24s G1Q8h 4m
17 Jul 2024 @ 064310m 5s G2Q7h 20m
16 Jul 2024 @ 23239m 48s T2C7h 29m
16 Jul 2024 @ 155411m 17s T1Q7h 30m
16 Jul 2024 @ 082410m 50s G1Q8h 56m
15 Jul 2024 @ 232811m 46s G1-6h 34m
15 Jul 2024 @ 165411m 1s T1Q6h 54m
15 Jul 2024 @ 1000-2-6h 15m
15 Jul 2024 @ 0345 A---6h 30m
14 Jul 2024 @ 21159m 54s D5/G1C8h 38m
14 Jul 2024 @ 12379m 31s D9D2/T2Q10h 22m
14 Jul 2024 @ 0215 A---6h 43m
13 Jul 2024 @ 193210m G1C7h 8m
13 Jul 2024 @ 12249m 29s G1C9h 9m
13 Jul 2024 @ 0315 A---7h 37m
12 Jul 2024 @ 19389m 42s D7/G1Q8h 38m
12 Jul 2024 @ 1100 ns---6h 15m
12 Jul 2024 @ 0445 A---10h 14m
11 Jul 2024 @ 183111m 54s G1Q7h 13m
11 Jul 2024 @ 111810m T1Q6h 33m
11 Jul 2024 @ 0445 A---7h 25m
10 Jul 2024 @ 212010m 22s T1C6h 56m
10 Jul 2024 @ 142412m 25s D3/G2*Q7h 24m
10 Jul 2024 @ 070011m 51s G1Q6h 45m
10 Jul 2024 @ 0015 ie---6h 37m
09 Jul 2024 @ 1737:4911m 47s D0/G2*Q6h 40m
09 Jul 2024 @ 10579m 54s T2Q7h 57m
09 Jul 2024 @ 0300 A---6h 59m
08 Jul 2024 @ 200110m 42s G1Q6h 48m
08 Jul 2024 @ 131311m 26s G1Q7h 19m
08 Jul 2024 @ 05549m 24s T2Q7h 57m
07 Jul 2024 @ 215711m 33s T1Q7h 22m
07 Jul 2024 @ 143511m 4s T1Q8h 50m
07 Jul 2024 @ 0545 wc-1-7h 57m
06 Jul 2024 @ 2148 wcG1C6h 25m
06 Jul 2024 @ 1523~10m G2Q6h 39m
06 Jul 2024 @ 08449m 55s D5/T1Q18h 19m
05 Jul 2024 @ 142511m 2s T2Q8h 14m
05 Jul 2024 @ 061112m 11s G2Q7h 41m
04 Jul 2024 @ 2229:129m 46s T1C9h 14m
04 Jul 2024 @ 131510m 33s T1Q9h 15m
04 Jul 2024 @ 0400 wc-1-7h 48m
03 Jul 2024 @ 201211:50G3Q8h 43m
03 Jul 2024 @ 112910m 31s T1C11h 44m
02 Jul 2024 @ 2345 A---8h 54m
02 Jul 2024 @ 145111m 29s G1Q7h 11m
02 Jul 2024 @ 074010m 56s T1Q16h 2m
01 Jul 2024 @ 1538D6/T1C8h 21m
01 Jul 2024 @ 071710m 45s T1Q8h 36m
30 Jun 2024 @ 2241 wc---6h 39m
30 Jun 2024 @ 16029:50T1C8h 16m
30 Jun 2024 @ 07469m 31s D0/T1C13h 26m
29 Jun 2024 @ 18209m 25s D8/G1C8h 59m
29 Jun 2024 @ 09219m 55s D2/T2C10h 2m
28 Jun 2024 @ 2319D7D10D0/G1C12h 17m
28 Jun 2024 @ 110211m 5s D2/T1Q8h 53m
28 Jun 2024 @ 0209 wc-1-6h 25m
27 Jun 2024 @ 1943:4411m 7s D3/T1Q8h 20m
27 Jun 2024 @ 112311m 46s T2*Q7h 49m
27 Jun 2024 @ 0334 wc---7h 49m
26 Jun 2024 @ 1944:369m 44s D0/T2Q6h 37m
26 Jun 2024 @ 1307 ns---6h 35m
26 Jun 2024 @ 06328m 40s D0/T1C13h 56m
25 Jun 2024 @ 16369m 55s T1Q8h 56m
25 Jun 2024 @ 074010m 39s G1Q10h 38m
24 Jun 2024 @ 210210m 20s T1Q6h 24m
24 Jun 2024 @ 14389m 25s D5D2/G1C9h 3m
24 Jun 2024 @ 0535 ie--Q8h 20m
23 Jun 2024 @ 211511m T1Q7h 37m
23 Jun 2024 @ 1337:0510m 2s T1Q10h 7m
23 Jun 2024 @ 0330 A---6h 53m

Interval Statistics

Interval Count100
Min6h 15m
Max18h 19m
Mean8h 5m
Median7h 35m
Grand-Specific
Start37T/36G (50.68% T)
Max Bursts3
Mean Bursts1.27
Median Bursts1
End51Q/22C (69.86% Q)

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
35887 14 Jul 2024 @ 0615 --- JimS First overflow
35884 14 Jul 2024 @ 0610 --- JimS Appears not quite in overflow
35867 13 Jul 2024 @ 0600 --- JimS Pool empty, Turban and Vent quiet.
35858 12 Jul 2024 @ 0651 --- JimS First water into pool
35857 12 Jul 2024 @ 0616 --- JimS Pool empty, Turban and Vent quiet.
35834 11 Jul 2024 @ 0643 --- JimS First water into pool.
35831 11 Jul 2024 @ 0546 --- JimS Pool empty, Vent and Turban i.e
35798 09 Jul 2024 @ 0710 --- JimS First overflow from pool
35796 09 Jul 2024 @ 0615 --- JimS Pool has some water, Turban i.e, Vent quiet
35736 06 Jul 2024 @ 0556 --- JimS Already in overflow
35694 03 Jul 2024 @ 0600 --- JimS Already in overflow
35671 02 Jul 2024 @ 0600 --- JimS Already in overflow
35625 30 Jun 2024 @ 0615 --- JimS In overflow
35583 27 Jun 2024 @ 0619 --- JimS First water into the pool.
35565 26 Jun 2024 @ 0555 --- JimS Already in overflow
35469 23 Jun 2024 @ 0603 --- JimS Pool nearly empty. Turban and Vent quiet.
35437 22 Jun 2024 @ 0607 --- JimS Pool empty, Vent and Turban ie.
35317 18 Jun 2024 @ 1919 --- Forestbewithyou 2 big boops/false starts
35270 17 Jun 2024 @ 0633 --- JimS First water into the pool
35269 17 Jun 2024 @ 0608 --- JimS Post eruptive. Vent and Turban quiet. Pool appears totally empty.
35241 16 Jun 2024 @ 0621 --- JimS Post eruptive, Vent quiet, Turban i.e., some water in the pool.
35231 15 Jun 2024 @ 0746 --- JimS First overflow from pool
35229 15 Jun 2024 @ 0616 --- JimS Post eruptive. Turban and Vent quiet.
35022 09 Jun 2024 @ 0500 --- K.Cooper a bit below half full, Mike said empty at 0300
34955 07 Jun 2024 @ 0708 --- JimS First overflow from pool
34952 07 Jun 2024 @ 0559 --- JimS Post eruptive. Already some water in the pool
34917 06 Jun 2024 @ 0617 --- JimS First water into pool at this time.
34665 25 May 2024 @ 0645 --- RLJones in eruption
34641 23 May 2024 @ 0022 --- JarnoO Either eruptive or post-eruptive at this time. In any case copious steaming until about 0100.
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.
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