Last Known Eruption
2h 50m ago
Predicted Next Eruption
Dec 10 at 0023 ± 105 minutes

Latest Eruptions

Eruption DurationCodeInterval
09 Dec 2024 @ 1640 ie wc---7h 58m
09 Dec 2024 @ 0842 ie wc---14h 5m
08 Dec 2024 @ 1837 wc---7h 21m
08 Dec 2024 @ 1116 ie wc-2-13h 51m
07 Dec 2024 @ 2125 wc---7h 14m
07 Dec 2024 @ 1411 ie wc-1-17h 51m
06 Dec 2024 @ 2020 wc-1-6h 33m
06 Dec 2024 @ 1347---20h 46m
05 Dec 2024 @ 1701 ie wc-1-6h 12m
05 Dec 2024 @ 1049 ie wc---17h 34m
04 Dec 2024 @ 1715 wc---1d 6h 20m
03 Dec 2024 @ 1055 ie wc---21h 33m
02 Dec 2024 @ 1322 wc-1-23h 10m
01 Dec 2024 @ 1412 ie wc---23h 46m
30 Nov 2024 @ 1426 wc---8h 7m
30 Nov 2024 @ 0619 wc-1-8h 33m
29 Nov 2024 @ 2146 wc-1-9h 23m
29 Nov 2024 @ 1223 wc-2-15h 51m
28 Nov 2024 @ 2032 wc-1-8h 12m
28 Nov 2024 @ 1220 wc---6h 51m
28 Nov 2024 @ 0529 wc-1-14h 1m
27 Nov 2024 @ 1528 wc---8h 56m
27 Nov 2024 @ 0632 wc-2-13h 58m
26 Nov 2024 @ 1634 ie wc---7h 8m
26 Nov 2024 @ 0926 ie wc-1-19h 5m
25 Nov 2024 @ 1421 wc-1-7h 14m
25 Nov 2024 @ 0707 wc-1-8h 9m
24 Nov 2024 @ 2258 wc---8h 48m
24 Nov 2024 @ 1410 wc---8h 24m
24 Nov 2024 @ 0546 wc---6h 20m
23 Nov 2024 @ 2326 wc---6h 18m
23 Nov 2024 @ 1708 wc-1-1d 6h 4m
22 Nov 2024 @ 1104 wc---6h 27m
22 Nov 2024 @ 0437 wc-1-14h 41m
21 Nov 2024 @ 1356 ie wc-2-15h 25m
20 Nov 2024 @ 2231 wc---6h 25m
20 Nov 2024 @ 1606 wc---7h 46m
20 Nov 2024 @ 0820 ns wc-1-8h 25m
19 Nov 2024 @ 2355 wc-1-7h 58m
19 Nov 2024 @ 1557 wc-2-7h 3m
19 Nov 2024 @ 0854 wc-2-7h 17m
19 Nov 2024 @ 0137 wc-1-7h 34m
18 Nov 2024 @ 1803 wc---7h 0m
18 Nov 2024 @ 1103 wc---7h 16m
18 Nov 2024 @ 0347 wc~11m -2-8h 4m
17 Nov 2024 @ 1943 wc---7h 40m
17 Nov 2024 @ 1203 wc---6h 21m
17 Nov 2024 @ 0542 wc~11m -1-7h 38m
16 Nov 2024 @ 2204 wc---7h 47m
16 Nov 2024 @ 1417 ie wc---7h 30m
16 Nov 2024 @ 0647 wc-1-8h 24m
15 Nov 2024 @ 2223 wc-1-6h 39m
15 Nov 2024 @ 1544 wc-2-7h 44m
15 Nov 2024 @ 0800 wc9¾m-1-8h 0m
15 Nov 2024 @ 0000 wc-1-7h 58m
14 Nov 2024 @ 1602 ns wc~11m -1-6h 25m
14 Nov 2024 @ 0937 wc~12m 2s -2*-7h 26m
14 Nov 2024 @ 0211 wc-2-7h 46m
13 Nov 2024 @ 1825 wc---9h 10m
13 Nov 2024 @ 0915 wc~11m -1-9h 32m
12 Nov 2024 @ 2343 wc-1-7h 3m
12 Nov 2024 @ 1640 wc~9m 38s -1-8h 3m
12 Nov 2024 @ 0837 wc-2-8h 43m
11 Nov 2024 @ 2354 wc-1-6h 22m
11 Nov 2024 @ 1732 ie wc-1-6h 25m
11 Nov 2024 @ 1107 ns wc~11m -2-15h 14m
10 Nov 2024 @ 1953 wc-2-7h 6m
10 Nov 2024 @ 1247 wc---16h 48m
09 Nov 2024 @ 1959 wc-1-8h 0m
09 Nov 2024 @ 1159 wc---8h 0m
09 Nov 2024 @ 0359 wc---6h 41m
08 Nov 2024 @ 2118 wc-1-6h 59m
08 Nov 2024 @ 1419 ie wc-2*Q6h 42m
08 Nov 2024 @ 0737 wc---16h 55m
07 Nov 2024 @ 1442 wc-2-5h 39m
07 Nov 2024 @ 0903 wc---19h 42m
06 Nov 2024 @ 1321 wc-1-7h 3m
06 Nov 2024 @ 0618 wc>11m -1-13h 45m
05 Nov 2024 @ 1633 ie wc---1d 22h 53m
03 Nov 2024 @ 1740 ie---1d 7h 43m
02 Nov 2024 @ 10579:29G1C23h 32m
01 Nov 2024 @ 1125 wc-1-6h 3m
01 Nov 2024 @ 0522 ns wc---7h 32m
31 Oct 2024 @ 2150 wc---6h 57m
31 Oct 2024 @ 1453 wc---7h 34m
31 Oct 2024 @ 0719 ie wc---14h 53m
30 Oct 2024 @ 1626 wc---8h 33m
30 Oct 2024 @ 0753 wc---17h 8m
29 Oct 2024 @ 1445 A wc---7h 45m
29 Oct 2024 @ 0700 A wc---6h 41m
29 Oct 2024 @ 0019 ns wc---6h 4m
28 Oct 2024 @ 1815 wc-1-1d 4h 44m
27 Oct 2024 @ 133110m G1C6h 59m
27 Oct 2024 @ 0632 ns wc---13h 27m
26 Oct 2024 @ 1705 wc>11m -2-6h 42m
26 Oct 2024 @ 1023 wc≥~10m47s---1d 18m
25 Oct 2024 @ 1005 ns wc---16h 37m
24 Oct 2024 @ 1728 wc-1-8h 5m
24 Oct 2024 @ 0923 wc-1-22h 37m
23 Oct 2024 @ 1046~10m G1Q6h 49m

Interval Statistics

Interval Count100
Min5h 39m
Max1d 22h 53m
Mean11h 25m
Median8h 0m
Grand-Specific
Start3G/1T (75% G)
Max Bursts2
Mean Bursts1.32
Median Bursts1
End3Q/2C (60% Q)

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
37624 18 Oct 2024 @ 0802 18 Oct 2024 @ 0812 bellamattio sudden tall start. ended abruptly. TALL ENCORE :D boardwalk very slippery be careful<3
37616 17 Oct 2024 @ 1703 --- kyle.G grand erupted sometime before 16:55. near end when I arrived
37469 10 Oct 2024 @ 0827 --- Ben VL No eruption yet.
37431 07 Oct 2024 @ 1147 --- Betty In overflow
37392 04 Oct 2024 @ 0800 --- Graham In "normal" overflow. No idea of the start time.
37337 03 Oct 2024 @ 0700 --- Graham Empty. Likely before 0600 per visitors.
37328 02 Oct 2024 @ 0840 --- Graham Close to overflow
37307 01 Oct 2024 @ 1031 --- Lizzysa An encore!
37300 01 Oct 2024 @ 0835 --- Ben VL No grand yet. (Hopefully not the same one I abandoned last night)
37199 28 Sep 2024 @ 0749 --- ddshepard Quiet; empty.
37160 26 Sep 2024 @ 0732 --- ddshepard Empty; Turban splashing
37148 25 Sep 2024 @ 0900 --- TSBryan Grand was late i.e. at 0900
36732 04 Sep 2024 @ 0643 --- SteveO Pool is empty, Turban and Vent quiet.
36711 03 Sep 2024 @ 0743 --- Graham In overflow under the boardwalk. Not first overflow.
36710 03 Sep 2024 @ 0710 --- Scott H no overflow
36654 31 Aug 2024 @ 0749 --- Graham Grand almost full with 0703 Turban. 0720, 0737 Turban. 0749 in overflow. Likely missed first overflow on one of prior cycles. Sorry, not used to watching for overflow.
36647 30 Aug 2024 @ 1905 --- ge now in delay 0
36430 17 Aug 2024 @ 0656 --- JimS No eruption yet
36397 14 Aug 2024 @ 0707 --- JimS Already in overflow
36387 13 Aug 2024 @ 0643 --- JimS Pool empty, Turban and Vent quiet. Pool still steaming. Grand erupted a short time ago.
36362 11 Aug 2024 @ 0658 --- JimS Already in overflow
36345 10 Aug 2024 @ 0825 --- JimS Start of overflow
36344 10 Aug 2024 @ 0656 --- JimS Pool nearly empty, Turban i.e
36282 05 Aug 2024 @ 0640 --- JimS Already in overflow
36258 04 Aug 2024 @ 0709 --- JimS First water into the pool.
36256 04 Aug 2024 @ 0630 --- JimS Pool empty, Turban and Vent quiet.
36240 03 Aug 2024 @ 0624 --- JimS Already in overflow
36219 02 Aug 2024 @ 0720 --- JimS Start of overflow
36200 01 Aug 2024 @ 0836 --- mhreed Has already hit overflow
36196 01 Aug 2024 @ 0635 --- JimS Not yet in overflow
36187 31 Jul 2024 @ 0631 --- JimS Already in overflow
36138 27 Jul 2024 @ 1615 --- mdschwarz Couple of 1-foot surges + high-pool waves
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
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