Last Known Eruption
16h 19m ago
Predicted Next Eruption
Today at 0355 ± 60 minutes

Latest Eruptions

Eruption DurationInterval
18 Mar 2024 @ 1125 wc maj1d 2h 56m
17 Mar 2024 @ 0829 ie wc16h 25m
16 Mar 2024 @ 1604 wc maj17h 4m
15 Mar 2024 @ 2300 wc maj1d 3h 16m
14 Mar 2024 @ 1944 wc min1d 20h 41m
12 Mar 2024 @ 2303 wc maj1d 8h 52m
11 Mar 2024 @ 1411 ie wc maj3d 5h 48m
08 Mar 2024 @ 0723 ie wc maj23h 31m
07 Mar 2024 @ 0752 wc maj15h 48m
06 Mar 2024 @ 1604 ie wc maj1d 17h 15m
04 Mar 2024 @ 2249 ns wc maj16h 49m
04 Mar 2024 @ 0600 wc maj17h 28m
03 Mar 2024 @ 1232 wc maj5h 29m
03 Mar 2024 @ 0703 ie wc min16h 5m
02 Mar 2024 @ 1458 wc maj1d 8h 34m
01 Mar 2024 @ 0624 wc maj16h 30m
29 Feb 2024 @ 1354 wc maj18h 10m
28 Feb 2024 @ 1944 wc maj12h 11m
28 Feb 2024 @ 0733 ie wc min7h 29m
28 Feb 2024 @ 0004 wc min16h 48m
27 Feb 2024 @ 0716 ie maj10h 39m
26 Feb 2024 @ 2037 wc min~11m 21h 26m
25 Feb 2024 @ 2311 wc maj18h 45m
25 Feb 2024 @ 0426 wc maj14h 42m
24 Feb 2024 @ 1344 wc min5m 16h 38m
23 Feb 2024 @ 2106 wc maj17h 43m
23 Feb 2024 @ 0323 wc maj5h 58m
22 Feb 2024 @ 2125 wc min17h 30m
22 Feb 2024 @ 0355 wc maj5h 18m
21 Feb 2024 @ 2237 wc min5m 15h 51m
21 Feb 2024 @ 0646 wc maj17h 35m
20 Feb 2024 @ 1311 wc maj5h 4m
20 Feb 2024 @ 0807 wc min4m 16h 31m
19 Feb 2024 @ 1536 wc maj16h 53m
18 Feb 2024 @ 2243 wc maj1d 1h 46m
17 Feb 2024 @ 2057 wc min2d 13h 7m
15 Feb 2024 @ 0750 ie wc maj2d 4m
13 Feb 2024 @ 0746 wc maj1d 18m
12 Feb 2024 @ 0728 wc maj13h 24m
11 Feb 2024 @ 1804 wc min17m 10h 54m
11 Feb 2024 @ 0710 A min16h 15m
10 Feb 2024 @ 1455 ie wc maj17h 41m
09 Feb 2024 @ 2114 ie maj6h 28m
09 Feb 2024 @ 1446 ns wc min21h 43m
08 Feb 2024 @ 1703 wc min16h 12m
08 Feb 2024 @ 0051 wc maj16h 23m
07 Feb 2024 @ 0828 wc maj17h 6m
06 Feb 2024 @ 1522 ie wc maj22h 30m
05 Feb 2024 @ 1652 maj1d 8h 41m
04 Feb 2024 @ 0811 ie wc maj17h 5m
03 Feb 2024 @ 1506 maj1d 8h 43m
02 Feb 2024 @ 0623 wc maj16h 34m
01 Feb 2024 @ 1349 ie maj1d 1h 54m
31 Jan 2024 @ 1155 min2d 9h 24m
29 Jan 2024 @ 0231 wc maj6h 42m
28 Jan 2024 @ 1949 wc min16h 24m
28 Jan 2024 @ 0325 ns wc maj18h 33m
27 Jan 2024 @ 0852 ie wc maj8h 12m
27 Jan 2024 @ 0040 ns wc min18h 6m
26 Jan 2024 @ 0634 ns wc maj13h 54m
25 Jan 2024 @ 1640 wc min17h 45m
24 Jan 2024 @ 2255 ns wc maj5h 23m
24 Jan 2024 @ 1732 wc min17h 26m
24 Jan 2024 @ 0006 ie wc maj8h 7m
23 Jan 2024 @ 1559 wc min16h 45m
22 Jan 2024 @ 2314 ns wc maj2d 10h 56m
20 Jan 2024 @ 1218 min22h 50m
19 Jan 2024 @ 1328 min3m 23h 1m
18 Jan 2024 @ 1427 min1d 6h 57m
17 Jan 2024 @ 0730 A min16h 49m
16 Jan 2024 @ 1441 wc maj1d 2h 43m
15 Jan 2024 @ 1158 min17h 19m
14 Jan 2024 @ 1839 maj1d 6h 46m
13 Jan 2024 @ 1153 min~4m 2d 3h 29m
11 Jan 2024 @ 0824 ie maj17h 29m
10 Jan 2024 @ 1455 wc min16h 20m
09 Jan 2024 @ 2235 ns wc maj1d 14h 11m
08 Jan 2024 @ 0824 ie wc maj18h 15m
07 Jan 2024 @ 1409 ie maj1d 5h 58m
06 Jan 2024 @ 0811 maj4h 1m
06 Jan 2024 @ 0410 wc min16h 25m
05 Jan 2024 @ 1145 ie wc maj18h 17m
04 Jan 2024 @ 1728 wc maj5h 8m
04 Jan 2024 @ 1220 ie min17h 50m
03 Jan 2024 @ 1830 E maj5h 45m
03 Jan 2024 @ 1245 min1d 2h 25m
02 Jan 2024 @ 1020 wc min18h 55m
01 Jan 2024 @ 1525 ie wc maj1d 1h 21m
31 Dec 2023 @ 1404 wc maj16h 37m
30 Dec 2023 @ 2127 wc maj19h 8m
30 Dec 2023 @ 0219 wc maj1d 7h 26m
28 Dec 2023 @ 1853 ie wc min20h 1m
27 Dec 2023 @ 2252 wc maj13h 9m
27 Dec 2023 @ 0943 ie wc min>4m 8h 55m
27 Dec 2023 @ 0048 wc min17m 18h 36m
26 Dec 2023 @ 0612 ns wc maj1d 2h 44m
25 Dec 2023 @ 0328 wc maj8h 27m
24 Dec 2023 @ 1901 wc min1d 17h 45m
23 Dec 2023 @ 0116 wc maj16h 32m
22 Dec 2023 @ 0844 wc maj17h 58m

Interval Statistics

Interval Count100
Min4h 1m
Max3d 5h 48m
Mean21h 4m
Median17h 29m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
34108 11 Mar 2024 @ 1728 --- K.Cooper Splashing, water is already back.
34040 16 Feb 2024 @ 0704 --- JarnoO (wc) Looked like it was in steam and would fit with NPS' 2345 prediction. Also implies a minor happened overnight. 0704 is the first time it was brought in view after the cam was parked on its overnight spot with Castle off-screen (sigh... with Castle in view there's still plenty of room for Beehive to be in frame).
33736 03 Jan 2024 @ 1100 --- mhvogel Castle had a major overnight
32936 16 Dec 2023 @ 0940 --- Pholli minor eruption this morning. steaming quietly with active bursts
28527 28 Sep 2023 @ 0830 --- User34 Huffing steam, one steamy splash, appears to have majored overnight
28440 24 Sep 2023 @ 1230 --- MikeG (wc) Looks like it had a minor overnight and is in sloppy phase.
28416 22 Sep 2023 @ 1640 --- jonp (WC) Appears to be in post-minor splashing mode
28229 12 Sep 2023 @ 0730 --- Ben VL Has had a major since last night's minor.
27513 11 Aug 2023 @ 0558 --- JimS Steaming quietly, had a major eruption overnight after the minor
27471 09 Aug 2023 @ 0609 --- JimS Steaming quietly. Had a major eruption overnight
27206 25 Jul 2023 @ 0600 --- JimS Sloshing. Boardwalk wet. Had a minor eruption
27079 16 Jul 2023 @ 0544 --- JimS Still sloshing. No major yet
27015 12 Jul 2023 @ 0530 --- JimS Steaming quietly. Had a major eruption overnight.
26954 09 Jul 2023 @ 0543 --- JimS Still sloshing. No major yet.
26781 02 Jul 2023 @ 0535 --- JimS Quietly steaming. Last eruption was a major
26757 01 Jul 2023 @ 0530 --- JimS Steaming quietly. Had a major eruption overnight
26688 27 Jun 2023 @ 0529 --- JimS Still trying to recover from overnight minor
26674 26 Jun 2023 @ 0538 --- JimS Must have had a minor overnight before the 0515 major
26389 17 Jun 2023 @ 0534 --- JimS Steaming quietly. Had a major eruption overnight
26350 16 Jun 2023 @ 0538 --- JimS Steaming quietly. Had a major eruption overnight.
26326 15 Jun 2023 @ 0538 --- JimS Sloshing. Had a minor eruption overnight.
26251 12 Jun 2023 @ 0530 --- JimS Quiet. Overnight eruption was a major.
26204 10 Jun 2023 @ 0555 --- JimS Steaming quietly. Overnight eruption was a major
25406 14 May 2023 @ 0610 --- User34 Still post-minor
25242 25 Apr 2023 @ 0839 --- Colin_W Looking like the last eruption was a minor.
25068 03 Mar 2023 @ 1426 --- Colin_W looks like it did a minor
25067 03 Mar 2023 @ 1044 --- ltgangi castle water could be seen just above tree line several times and then it died.down.
25031 23 Feb 2023 @ 0432 --- JarnoO possible start time of an eruption - frequently obscured by steam from elsewhere (primarily MYR) and darkness didn't help
24432 16 Oct 2022 @ 1800 --- Ben VL Almost no splashing seen in quite a while. I think either the 0316E was actually a major, or it has had one since.
24391 15 Oct 2022 @ 1136 --- Ben VL Castle back on after 5m of quiet. Done again @ 1139. See the 1127 entry for details.
23471 29 Aug 2022 @ 0615 --- JimS Sloshing. Had a minor eruption overnight.
23454 28 Aug 2022 @ 0618 --- JimS Sloshing. Had a minor eruption overnight.
23406 26 Aug 2022 @ 0615 --- JimS Steaming quietly. Had a major eruption overnight.
23380 24 Aug 2022 @ 0611 --- JimS Sloshing. Last eruption was a minor.
23342 22 Aug 2022 @ 0616 --- JimS Sloshing. Last eruption was a minor.
23308 21 Aug 2022 @ 0615 --- JimS Steaming quietly. Apparently had a major eruption overnight.
23222 17 Aug 2022 @ 0605 --- JimS Steaming quietly. Appears to have had a major eruption.
23110 09 Aug 2022 @ 0703 --- JimS Has been sloshing the last hour. Had a minor eruption overnight.
23095 08 Aug 2022 @ 0556 --- JimS Sloshing. Still trying to recover from minors.
23085 07 Aug 2022 @ 0621 --- JimS Has been steaming quietly. Had a major eruption overnight.
23067 06 Aug 2022 @ 0559 --- JimS Quiet. Had a major eruption overnight.
23022 04 Aug 2022 @ 0607 --- JimS Sloshing. Had a minor eruption overnight.
22970 02 Aug 2022 @ 0528 --- JimS Steaming gently, boardwalk soaked. Had a major eruption overnight.
22901 28 Jul 2022 @ 0540 --- JimS Steaming quietly, boardwalk soaked. Had a major eruption.
22872 27 Jul 2022 @ 0545 --- JimS Still sloshing. Has not yet had a major eruption.
22823 24 Jul 2022 @ 0543 --- JimS Splashing heavily. Had a minor eruption overnight.
22798 23 Jul 2022 @ 0534 --- JimS Splashing heavily. Trying to recover from a minor eruption. May have had a second minor overnight
22802 22 Jul 2022 @ 1934 --- DinosaursArentReal tourist showed me a video of castle erupting about 5 ft. video was timestamped from 1934-1939
22753 21 Jul 2022 @ 0547 --- JimS Quiet. Boardwalk soaked. Had a major eruption overnight.
22584 15 Jul 2022 @ 0535 --- JimS Was a major eruption.
22372 07 Jul 2022 @ 0524 --- JimS Steaming quietly. Had a major eruption overnight.
22348 06 Jul 2022 @ 0551 --- JimS Still trying to recover from a minor eruption. Splashing heavily.
22334 05 Jul 2022 @ 0514 --- JimS Quiet steaming. Had a major eruption overnight.
22278 02 Jul 2022 @ 0535 --- JimS Splashing frequently. Had a minor eruption overnight.
22254 01 Jul 2022 @ 0700 --- User34 Large heavy splashes, based on current interval it appears to have minored overnight
22194 29 Jun 2022 @ 0656 --- JimS Castle has been quiet indicating that its overnight eruption was a major
22136 26 Jun 2022 @ 1428 --- DaveM Major erption
21990 16 Jun 2022 @ 0630 --- RMichaels Castle is lightly billowing steam. It probably had a major sometime overnight.
21912 11 Jun 2022 @ 0800 --- Colin_W splashing on cone.
21150 02 May 2022 @ 0915 --- aferrara Heavy, tall splashing.
21134 30 Apr 2022 @ 1300 30 Apr 2022 @ 1630 User34 Splashing heavily
21077 25 Apr 2022 @ 0605 --- RMichaels Quiet. Castle appears to have had a major overnight.
20943 05 Apr 2022 @ 1326 --- Kevin L Castle was not erupting when I switched to Lion ie at 1238. I did a quick check before I switched to OF and Castle looked ie.
20764 29 Jan 2022 @ 0830 --- aferrara Castle is quietly steaming with rare, short splashes. No eruptions on the logger since 1447 yesterday.
20762 28 Jan 2022 @ 0000 --- aferrara Logger shows no eruption overnight.
20646 07 Jan 2022 @ 0900 --- aferrara Billowing steam with frequent splashing (5-15' or so over the top of the cone). Logger is having trouble reading majors vs minors right now, but I believe Art-P's major observation via the webcam. Castle looks remarkably like it did post-major in late June 2021, when its intervals became long and irregular.
20282 03 Nov 2021 @ 0822 --- DaveM Looking at the webcam capture, this was a minor.
20182 29 Oct 2021 @ 0835 --- aferrara Castle erupted 2258E last night. Graph looks like a long minor but in the basin it looks like it majored overnight (billowing steam, no splashing or spritzing). Probably a major, but unclear.
19552 14 Sep 2021 @ 0025 --- Suzanne heard in steam phase from the boardwalk near Tardy
19549 13 Sep 2021 @ 1900 13 Sep 2021 @ 2115 William good splashing but no eruption during this time.
19503 12 Sep 2021 @ 0635 --- William in steam. had a major overnight.
19313 05 Sep 2021 @ 0805 --- Kitt B Appears to haveminored. Heavy splashing seen.
18428 15 Jul 2021 @ 0550 --- SteveO Had a major overnight, billowing steam and boardwalk is wet.
18412 14 Jul 2021 @ 0540 --- RMichaels Billowing steam as if it had a major eruption very early this morning.
18252 03 Jul 2021 @ 0543 --- JimS Quiet. Boardwalk soaked. Had a major eruption overnight.
18235 02 Jul 2021 @ 0530 --- JimS Quiet. Had a major eruption overnight.
18195 30 Jun 2021 @ 0532 --- JimS Quiet. Boardwalk soaked. Had major eruption overnight.
17967 21 Jun 2021 @ 1648 --- Graham VEC is now officially not predicting Castle. Recent intervals suggest 19 to 22h intervals without minors. Longer intervals started ~16th.
17842 16 Jun 2021 @ 0542 --- JimS May have also had a minor a few hours earlier since 17 hour interval is so large to this eruption.
17760 14 Jun 2021 @ 0541 --- JimS Sloshing. Overnight eruption was another minor.
17648 11 Jun 2021 @ 0557 --- JimS Quiet. Had a major eruption overnight.
17465 04 Jun 2021 @ 1130 --- steve Just an odd note, I looked at the temperature monitor for Castle and there was no other eruption on the temp monitor recorded between the 0759 eruption on the 3rd and the 1011 eruption today on the 4th. I’m not sure what to make of it.
17420 04 Jun 2021 @ 0612 --- JimS Still displaying post minor behavior.
17125 18 May 2021 @ 0630 --- JimS Quiet. Had a major eruption overnight. The 0230 eruption must have been a major.
17109 17 May 2021 @ 0716 --- JimS Quiet. Had a major eruption overnight.
16990 06 May 2021 @ 0757 --- JimS Castle is sloshing. Overnight eruption was apparently a minor.
16815 19 Jan 2021 @ 1431 --- mhvogel The graph barely picked up the eruption, if the small spike on the graph was an eruption. I think the graph is somehow wrong because I don't recall Castle having 12.5 hour intervals. I'll erase the entry when more data is available.
16810 16 Jan 2021 @ 1652 --- Graham Castle is a Major.
16441 19 Oct 2020 @ 1057 --- am Lightly steaming. Last eruption was a major
16148 17 Sep 2020 @ 0645 --- William On a bike-by observation it looks to me like Castle had a major eruption overnight
15726 25 Aug 2020 @ 0813 --- am Castle spitting up water and showing signs it’s previous eruption was a minor.
14159 26 Mar 2020 @ 0704 --- CraigC Looks post-Major at 07:04
14110 02 Feb 2020 @ 1434 --- mhvogel The Bluetooth readout confirms it was a major.
13983 28 Oct 2019 @ 1537 --- mhvogel After reviewing the castle logger graph several times, castle had a minor. The duration of the eruption was 12 minutes. I lined up the start of the spike on the graph to the end of it. The spike on the graph is small compared to the rest of the previous eruptions.
13953 17 Oct 2019 @ 0930 17 Oct 2019 @ 0949 AngelaT Castle is erupting short bursts up to 1 meter, sporadically, indicative of a previous minor eruption.
13673 13 Sep 2019 @ 0530 --- B**2 From Beehive, sounded like steam phase of eruption. Perhaps major after minor? Anxiously waiting for electronic. With last moonlight looks like eruption.
12788 24 Jul 2019 @ 1449 --- cwonder Sporadic heavy splashing with occasional 5-20' bursts
11612 07 Jun 2019 @ 0848 --- B**2 Very quiet. Probably an overnight major. Was quiet when I passed by about 07:00 too.
11438 31 May 2019 @ 0713 --- B**2 Castle quiet - probable overnight major.
11283 21 May 2019 @ 1130 --- AngelaT Observed erratic, ongoing eruptions up to 2 m high past 1 hour.
EntrySourceLinkComment
23 May 2017 @ 1746 JSJ https://www.youtube.com/watch?v=Xhs0ZWQEJ04 Half-minute video showing Castle Geyser's 5:46 PM-onward eruption on 23 May 2017.
10 Aug 2018 @ 1427 JSJ https://www.flickr.com/photos/jsjgeology/46465868542 Photo (1 of 3) of Castle Geyser's 2:27 PM-onward eruption on 10 August 2018, as seen from boardwalk near Liberty Pool.
28 Jan 2017 @ 1039 JSJ https://www.youtube.com/watch?v=eSORnt-mHN0 Video of Castle Geyser erupting (water phase) on 28 January 2017.
11 Aug 2016 @ 1358 JSJ https://www.flickr.com/photos/jsjgeology/30476239182 Thermal image (1 of 4) of Castle Geyser's 1:58 PM-onward eruption on 11 August 2016.
11 Aug 2016 @ 1358 JSJ https://www.flickr.com/photos/jsjgeology/29959320393 Photo (1 of 7) of Castle Geyser's 1:58 PM-onward eruption on 11 August 2016.
03 Jun 2016 @ 1748 JSJ https://www.flickr.com/photos/jsjgeology/29096074105 Photo (1 of 3) of Castle Geyser's 5:48 PM-onward eruption on 3 June 2016.
03 Jul 2013 @ 0711 JSJ https://www.youtube.com/watch?v=dlT_ulj6fmI Video by Micah Kipple of the 3 July 2013 morning major eruption (steam phase) of Castle Geyser.
03 Jul 2013 @ 0711 JSJ https://www.youtube.com/watch?v=UVClJ3jb52M Video by Micah Kipple of the 3 July 2013 morning major eruption (water phase) of Castle Geyser.
15 Aug 2015 @ 0957 JSJ https://www.youtube.com/watch?v=fP59M_A8la8#t=6m57s See clips # 18-31 (time stamp - 6:57) of this video compilation.
14 Aug 2015 @ 1530 JSJ https://www.youtube.com/watch?v=fP59M_A8la8#t=4m09s See clips # 11-17 (time stamps - 4:09 to 6:57) of this video compilation.
09 Aug 2015 @ 1544 JSJ https://www.youtube.com/watch?v=fP59M_A8la8 See clips # 6-10 of this video compilation.
16 Aug 2014 @ 1234 JSJ https://www.youtube.com/watch?v=fP59M_A8la8 See clips # 3-5 of this video compilation.
06 Jul 2015 @ 1256 JSJ https://www.youtube.com/watch?v=fP59M_A8la8 See clips # 1-2 of this video compilation.
28 Sep 2015 @ 0542 td http://i61.tinypic.com/2hdwbqf.jpg Castle 5:47
08 Sep 2014 @ 1201 Micah Kipple https://www.flickr.com/photos/sgplewka/15582865600 flickr
24 Sep 2014 @ 1338 Micah Kipple https://www.flickr.com/photos/126760153@N03/15642309900 flickr
17 Oct 2014 @ 1224 Micah Kipple https://www.flickr.com/photos/57621754@N08/15785065928 flickr
28 Sep 2014 @ 1458 Micah Kipple https://www.flickr.com/photos/castle_bravo/15661819608 flickr
26 Sep 2012 @ 1234 Micah Kipple https://www.flickr.com/photos/npsaficionado/15830592629 flickr
29 Aug 2011 @ 1444 Micah Kipple https://www.flickr.com/photos/128570456@N08/15922246028 flickr
BaselineDistance (ft)Description
Bike Path 200On the side of the bike path south of the geyser.