Last Known Eruption
4h 14m ago
Predicted Next Eruption
Jul 27 at 0608 ± 60 minutes

Latest Eruptions

Eruption DurationInterval
26 Jul 2024 @ 1338 maj16h 24m
25 Jul 2024 @ 2114 wc maj15h 58m
25 Jul 2024 @ 0516 wc maj19h 6m
24 Jul 2024 @ 1010 maj15h 30m
23 Jul 2024 @ 1840 ie wc min>3m 6h 15m
23 Jul 2024 @ 1225 min6m 18h 53m
22 Jul 2024 @ 1732 maj16h 31m
22 Jul 2024 @ 0101 min3m 18h 40m
21 Jul 2024 @ 0621 maj13h 57m
20 Jul 2024 @ 1624 min6m 7h 38m
20 Jul 2024 @ 0846 wc min5m 11h 49m
19 Jul 2024 @ 2057 wc min11½m16h 5m
19 Jul 2024 @ 0452 wc maj16h 16m
18 Jul 2024 @ 1236 maj15h 52m
17 Jul 2024 @ 2044 maj16h 4m
17 Jul 2024 @ 0440 ie wc maj17h 19m
16 Jul 2024 @ 1121 wc maj3h 1m
16 Jul 2024 @ 0820 A min17h 14m
15 Jul 2024 @ 1506 ie maj4h 49m
15 Jul 2024 @ 1017 min1d 4h 17m
14 Jul 2024 @ 0600 min16h 24m
13 Jul 2024 @ 1336 maj18h 16m
12 Jul 2024 @ 1920 A maj9h 2m
12 Jul 2024 @ 1018 min15h 46m
11 Jul 2024 @ 1832 ie maj1d 8h 21m
10 Jul 2024 @ 1011 maj16h 18m
09 Jul 2024 @ 1753 maj15h 59m
09 Jul 2024 @ 0154 ie wc maj17h 18m
08 Jul 2024 @ 0836 maj18m 23h 29m
07 Jul 2024 @ 0907 maj1d 2h 12m
06 Jul 2024 @ 0655 min18h 14m
05 Jul 2024 @ 1241 maj1d 24m
04 Jul 2024 @ 1217 min16h 17m
03 Jul 2024 @ 2000 maj15h 47m
03 Jul 2024 @ 0413 ns wc maj16h 7m
02 Jul 2024 @ 1206 maj16h 18m
01 Jul 2024 @ 1948 wc maj1d 10h 47m
30 Jun 2024 @ 0901 wc maj1d 1h 26m
29 Jun 2024 @ 0735 wc min16h 19m
28 Jun 2024 @ 1516 maj17h 32m
27 Jun 2024 @ 2144 wc maj7h 3m
27 Jun 2024 @ 1441 min4m 1d 7h 45m
26 Jun 2024 @ 0656 maj15h 51m
25 Jun 2024 @ 15051d 8h 24m
24 Jun 2024 @ 0641 maj16h 15m
23 Jun 2024 @ 1426 maj1d 10h 31m
22 Jun 2024 @ 0355 ie maj16h 26m
21 Jun 2024 @ 1129 min6h 26m
21 Jun 2024 @ 0503 wc min15h 58m
20 Jun 2024 @ 1305 maj17h 14m
19 Jun 2024 @ 1951 ie maj6h 43m
19 Jun 2024 @ 1308 min4m 16h 57m
18 Jun 2024 @ 2011 ie maj6h 30m
18 Jun 2024 @ 1341 wc min15h 55m
17 Jun 2024 @ 2146 wc maj16h 16m
17 Jun 2024 @ 0530 wc maj16h 0m
16 Jun 2024 @ 1330 maj1d 8h 11m
15 Jun 2024 @ 0519 wc maj15h 55m
14 Jun 2024 @ 1324 maj16m 16h 18m
13 Jun 2024 @ 2106 wc maj16h 11m
13 Jun 2024 @ 0455 wc maj19h 5m
12 Jun 2024 @ 0950 maj1d 4m
11 Jun 2024 @ 0946 wc min16h 9m
10 Jun 2024 @ 1737 maj2d 7h 21m
08 Jun 2024 @ 1016 maj16h 13m
07 Jun 2024 @ 1803 maj1d 8h 6m
06 Jun 2024 @ 0957 maj16m 15h 51m
05 Jun 2024 @ 1806 ns wc maj1d 8h 38m
04 Jun 2024 @ 0928 maj16h 18m
03 Jun 2024 @ 1710 ie maj1d 8h 10m
02 Jun 2024 @ 0900 maj16h 15m
01 Jun 2024 @ 1645 maj1d 9h 30m
31 May 2024 @ 0715 ie wc maj7h 45m
30 May 2024 @ 2330 A min15h 33m
30 May 2024 @ 0757 ie maj18h 19m
29 May 2024 @ 1338 ns wc maj1d 4h 25m
28 May 2024 @ 0913 maj17h 58m
27 May 2024 @ 1515 maj6h 54m
27 May 2024 @ 0821 min5m 15h 58m
26 May 2024 @ 1623 maj1d 8h 23m
25 May 2024 @ 0800 ie wc maj17h 41m
24 May 2024 @ 1419 ns6h 6m
24 May 2024 @ 0813 wc min15h 53m
23 May 2024 @ 1620 ie wc maj16h 8m
23 May 2024 @ 0012 ie wc maj16h 40m
22 May 2024 @ 0732 wc maj16h 4m
21 May 2024 @ 1528 wc maj15h 50m
20 May 2024 @ 2338 wc maj17h 29m
20 May 2024 @ 0609 wc maj5h 57m
20 May 2024 @ 0012 wc min6m 15h 56m
19 May 2024 @ 0816 maj15h 39m
18 May 2024 @ 1637 maj16h 14m
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

Interval Statistics

Interval Count100
Min3h 1m
Max2d 7h 21m
Mean18h 26m
Median16h 18m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
36012 21 Jul 2024 @ 0600 --- JimS Sloshing. Still no major
35992 20 Jul 2024 @ 0631 --- JimS Sloshing. Has not yet had a major eruption
35866 13 Jul 2024 @ 0550 --- JimS Steaming quietly. Had a major eruption overnight
35830 11 Jul 2024 @ 0546 --- JimS Steaming quietly. Had a major eruption overnight
35795 09 Jul 2024 @ 0606 --- JimS Steaming quietly. Had a major eruption overnight
35772 08 Jul 2024 @ 0542 --- JimS Sloshing. Had a minor eruption overnight
35753 07 Jul 2024 @ 0609 --- JimS Still sloshing. No major yet
35723 05 Jul 2024 @ 0552 --- JimS Still sloshing. No major yet
35655 01 Jul 2024 @ 0550 --- JimS Steaming quietly. Had a major eruption overnight
35634 30 Jun 2024 @ 0928 --- Polly Castle is in steam phase
35624 30 Jun 2024 @ 0607 --- JimS Still sloshing. Has not yet had a major eruption.
35582 27 Jun 2024 @ 0610 --- JimS Steaming quietly. Had a major eruption overnight
35542 25 Jun 2024 @ 0610 --- JimS Has been steaming quietly. Had a major eruption overnight.
35133 12 Jun 2024 @ 0604 --- JimS Still sloshing. Has not had a major eruption yet.
35020 09 Jun 2024 @ 0259 --- Mikemcc post major steam phase
34951 07 Jun 2024 @ 0550 --- JimS Quiet. Had a major eruption overnight
34745 29 May 2024 @ 0804 --- Stephen_Gemar Sloshing. Likely had a minor overnight.
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.
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.