Last Known Eruption
35m ago
Predicted Next Eruption
Today at 0011 ± 60 minutes

Latest Eruptions

Eruption DurationInterval
18 May 2024 @ 0023 wc maj17h 42m
17 May 2024 @ 06415h 13m
17 May 2024 @ 0128 wc min17h 13m
16 May 2024 @ 0815 ie wc maj21h 8m
15 May 2024 @ 1107 maj16h 14m
14 May 2024 @ 1853 wc maj1d 9h 49m
13 May 2024 @ 0904 maj1d 22h 2m
11 May 2024 @ 1102 maj18h 12m
10 May 2024 @ 1650 ns maj2d 3h 44m
08 May 2024 @ 1306 ie wc maj16h 31m
07 May 2024 @ 2035 ns maj16h 5m
07 May 2024 @ 0430 ie wc maj16h 52m
06 May 2024 @ 1138 ie maj16h 6m
05 May 2024 @ 1932 wc maj1d 8h 43m
04 May 2024 @ 1049 maj18h 42m
03 May 2024 @ 1607 ie wc maj21h 24m
02 May 2024 @ 1843 min5m 53s 16h 10m
02 May 2024 @ 0233 wc maj16h 5m
01 May 2024 @ 1028 ie wc maj16h 31m
30 Apr 2024 @ 1757 wc maj15h 29m
30 Apr 2024 @ 0228 ie wc maj16h 33m
29 Apr 2024 @ 0955 maj18h 11m
28 Apr 2024 @ 1544 maj10h 58m
28 Apr 2024 @ 0446 wc min17h 28m
27 Apr 2024 @ 1118 ie wc maj1d 3h 51m
26 Apr 2024 @ 0727 ie wc maj15h 43m
25 Apr 2024 @ 1544 ie maj15h 55m
24 Apr 2024 @ 2349 wc maj1d 9h 28m
23 Apr 2024 @ 1421 ns maj16h 5m
22 Apr 2024 @ 2216 wc maj16h 25m
22 Apr 2024 @ 0551 wc maj16h 11m
21 Apr 2024 @ 1340 maj15h 43m
20 Apr 2024 @ 2157 wc maj17h 19m
20 Apr 2024 @ 0438 wc maj4h 38m
20 Apr 2024 @ 0000 wc min16h 50m
19 Apr 2024 @ 0710 ie wc maj1d 14h 22m
17 Apr 2024 @ 1648 wc maj1d 9h 0m
16 Apr 2024 @ 0748 ie wc maj22h 10m
15 Apr 2024 @ 0938 ie wc maj22h 26m
14 Apr 2024 @ 1112 wc maj1d 1h 14m
13 Apr 2024 @ 0958 wc min4m 15h 55m
12 Apr 2024 @ 1803 ie wc maj1d 8h 3m
11 Apr 2024 @ 1000 ie wc maj21h 29m
10 Apr 2024 @ 1231 wc maj2d 1h 8m
08 Apr 2024 @ 1123 ie wc maj22h 36m
07 Apr 2024 @ 1247 wc maj22h 0m
06 Apr 2024 @ 1447 ie wc maj1d 5h 46m
05 Apr 2024 @ 0901 wc maj17h 30m
04 Apr 2024 @ 1531 ie maj2d 9h 8m
02 Apr 2024 @ 0623 ie wc maj18h 10m
01 Apr 2024 @ 1213 wc min16h 27m
31 Mar 2024 @ 1946 wc maj1d 16h 22m
30 Mar 2024 @ 0324 wc maj7h 45m
29 Mar 2024 @ 1939 ns wc16h 50m
29 Mar 2024 @ 0249 wc maj22h 2m
28 Mar 2024 @ 0447 wc maj18h 17m
27 Mar 2024 @ 1030 ie wc maj11h 5m
26 Mar 2024 @ 2325 wc min3h 21m
26 Mar 2024 @ 2004 wc min17h 21m
26 Mar 2024 @ 0243 ns wc maj7h 53m
25 Mar 2024 @ 1850 ns wc min15h 32m
25 Mar 2024 @ 0318 wc maj16h 27m
24 Mar 2024 @ 1051 ie wc maj16h 1m
23 Mar 2024 @ 1850 wc maj16h 0m
23 Mar 2024 @ 0250 wc maj16h 59m
22 Mar 2024 @ 0951 ie wc maj5h 41m
22 Mar 2024 @ 0410 wc min16h 10m
21 Mar 2024 @ 1200 wc maj17h 16m
20 Mar 2024 @ 1844 ie wc maj22h 17m
19 Mar 2024 @ 2027 wc maj1d 9h 2m
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

Interval Statistics

Interval Count100
Min3h 21m
Max3d 5h 48m
Mean20h 48m
Median17h 8m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
34484 09 May 2024 @ 0610 --- CraigC Castle looks to be in post-eruptive steam phase
34386 30 Apr 2024 @ 1803 --- MikeG ie, looks like it might quit at any moment. (But apparently it didn't)
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.
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.