Last Known Eruption
4h 50m ago
Predicted Next Eruption
Today at 2208 ± 45 minutes

Latest Eruptions

Eruption DurationInterval
28 May 2020 @ 0823 E maj13h 57m
27 May 2020 @ 1826 wc maj14h 20m
27 May 2020 @ 0406 E maj14h 9m
26 May 2020 @ 1357 maj13h 48m
26 May 2020 @ 0009 E maj14h 29m
25 May 2020 @ 0939:32 maj14h 4m
24 May 2020 @ 1935 E maj13h 58m
24 May 2020 @ 0537 wc maj13h 50m
23 May 2020 @ 1547 ie maj14h 4m
23 May 2020 @ 0143 E maj13h 59m
22 May 2020 @ 1144 wc maj13h 59m
21 May 2020 @ 2145 wc maj13h 52m
21 May 2020 @ 0753 wc maj14h 17m
20 May 2020 @ 1736 wc maj13h 51m
20 May 2020 @ 0345 ie wc maj14h 0m
19 May 2020 @ 1345 wc maj14h 40m
18 May 2020 @ 2305 E maj8h 5m
18 May 2020 @ 1500 ns min13h 30m
18 May 2020 @ 0130 E min14h 8m
17 May 2020 @ 1122 E maj13h 46m
16 May 2020 @ 2136 ns wc maj14h 4m
16 May 2020 @ 0732 wc maj13h 56m
15 May 2020 @ 1736 ns wc maj13h 51m
15 May 2020 @ 0345 ie wc maj14h 8m
14 May 2020 @ 1337 E maj14h 9m
13 May 2020 @ 2328 E maj14h 35m
13 May 2020 @ 0853 E maj13h 57m
12 May 2020 @ 1856 wc maj13h 51m
12 May 2020 @ 0505 wc maj13h 36m
11 May 2020 @ 1529 E maj15h 36m
10 May 2020 @ 2353 E maj13h 57m
10 May 2020 @ 0956 wc min14h 8m
09 May 2020 @ 1948 wc maj13h 50m
09 May 2020 @ 0558 wc maj14h 23m
08 May 2020 @ 1535 wc maj14h 30m
08 May 2020 @ 0105 wc maj14h 44m
07 May 2020 @ 1021 wc maj14h 21m
06 May 2020 @ 2000 wc maj14h 9m
06 May 2020 @ 0551 E maj13h 56m
05 May 2020 @ 1555 E maj14h 1m
05 May 2020 @ 0154 wc maj15h 20m
04 May 2020 @ 1034 wc maj4h 49m
04 May 2020 @ 0545 ns wc min13h 57m
03 May 2020 @ 1548 wc maj14h 53m
03 May 2020 @ 0055 wc maj5h 50m
02 May 2020 @ 1905 ie wc min13h 41m
02 May 2020 @ 0524 E maj14h 24m
01 May 2020 @ 1500 maj13h 42m
01 May 2020 @ 0118 wc maj5h 6m
30 Apr 2020 @ 2012 wc min14h 59m
30 Apr 2020 @ 0513 E maj9h 2m
29 Apr 2020 @ 2011 ie wc13h 49m
29 Apr 2020 @ 0622 ns wc maj14h 14m
28 Apr 2020 @ 1608 E maj14h 6m
28 Apr 2020 @ 0202 E maj13h 58m
27 Apr 2020 @ 1204 ie wc maj14h 7m
26 Apr 2020 @ 2157 wc maj14h 26m
26 Apr 2020 @ 0731 E maj14h 20m
25 Apr 2020 @ 1711 E maj15h 16m
25 Apr 2020 @ 0155 E maj6h 49m
24 Apr 2020 @ 1906 E min14h 5m
24 Apr 2020 @ 0501 E maj14h 12m
23 Apr 2020 @ 1449 E maj15h 10m
22 Apr 2020 @ 2339 E maj5h 58m
22 Apr 2020 @ 1741 E min14h 49m
22 Apr 2020 @ 0252 E maj5h 23m
21 Apr 2020 @ 2129 wc min13h 53m
21 Apr 2020 @ 0736 ie wc maj15h 13m
20 Apr 2020 @ 1623 ie wc maj7h 42m
20 Apr 2020 @ 0841 E min13h 55m
19 Apr 2020 @ 1846 wc maj14h 11m
19 Apr 2020 @ 0435 E maj14h 15m
18 Apr 2020 @ 1420 wc maj1d 4h 56m
17 Apr 2020 @ 0924 ns wc maj6h 59m
17 Apr 2020 @ 0225 E min14h 22m
16 Apr 2020 @ 1203 E maj1d 3h 53m
15 Apr 2020 @ 0810 ie wc maj14h 14m
14 Apr 2020 @ 1756 ie wc maj1d 5h 12m
13 Apr 2020 @ 1244 ie wc5h 24m
13 Apr 2020 @ 0720 wc min~5m 14h 18m
12 Apr 2020 @ 1702 ns wc maj14h 25m
12 Apr 2020 @ 0237 wc maj14h 36m
11 Apr 2020 @ 1201 ie wc maj1d 4h 11m
10 Apr 2020 @ 0750 ns wc maj13h 54m
09 Apr 2020 @ 1756 wc maj13h 51m
09 Apr 2020 @ 0405 wc maj16h 18m
08 Apr 2020 @ 1147 wc maj17h 42m
07 Apr 2020 @ 1805 ie wc min14h 16m
07 Apr 2020 @ 0349 ie wc maj13h 20m
06 Apr 2020 @ 1429 ie wc maj16h 16m
05 Apr 2020 @ 2213 wc maj5h 19m
05 Apr 2020 @ 1654 wc min~6m 14h 29m
05 Apr 2020 @ 0225 wc maj4h 5m
04 Apr 2020 @ 2220 wc min13h 41m
04 Apr 2020 @ 083914h 2m
03 Apr 2020 @ 1837 ie wc maj11h 59m
03 Apr 2020 @ 0638 ie wc maj1d 3h 55m
02 Apr 2020 @ 0243 ie wc maj15h 6m
01 Apr 2020 @ 1137 ie wc maj14h 11m
31 Mar 2020 @ 2126 wc maj14h 53m

Interval Statistics

Interval Count100
Min4h 5m
Max1d 5h 12m
Mean13h 56m
Median14h 5m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
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.
11373 21 May 2019 @ 1045 --- Ben VL Sloppy. Minored overnight.
11127 29 Apr 2019 @ 1023 --- Polly Appears to have had a major this morning.
11093 27 Apr 2019 @ 0751 --- Micah Kipple Splashy play. May have minored overnight
11045 22 Apr 2019 @ 1057 --- mhvogel A volunteer observed castle having a major. He saw it transition from water to heavy steam phase.
10953 03 Mar 2019 @ 0845 03 Mar 2019 @ 1045 AngelaT A lot of splashing activity observed. Did it have a minor this morning?
10759 02 Dec 2018 @ 0341 --- JSJ GOSA playback shows a Castle eruption at 0341 with a more slender steam column than the 2204 eruption. Steam column present to about 0430 at least, when visibility was lost.
10696 01 Nov 2018 @ 1115 --- mhvogel According to the electronic download castle had a minor @ 0326. I didn't see any other eruptions from castle on the download after that time.
10322 21 Sep 2018 @ 1317 --- Minafuku Castle doing lots of high splashes for being only halfway through its cycle. Apparently has been for awhile already.
10264 16 Sep 2018 @ 1804 --- STS New NPS prediction of 0515 on September 17
9866 25 Aug 2018 @ 0758 --- Minafuku Quiet. Major overnight.
9268 22 Jul 2018 @ 0553 --- JimS Sloshing. Overnight eruption was a minor.
8413 02 Jun 2018 @ 1237 --- DaveM Duration was 4 minutes. Geysertimes chose a less complete entry submitted 7 minutes after the eruption over a webcam entry. I find the bias of the software disturbing. A more complete entry should be listed as primary whether is is submitted immediately or much later or if it is seen in person or on the webcam.
8235 19 May 2018 @ 0934 --- JimS Sloshing vigorously. Had a minor overnight.
8044 29 Apr 2018 @ 2134 --- Micah Kipple beginning to transition into steam
7963 31 Mar 2018 @ 2218 --- Pat Snyder Might have minored. IE at 2211, off by 2217. I didn't see the start, though.
7878 27 Jan 2018 @ 1400 --- Graham Not in steam phase. must have had a minor. No eruption seen during my wait for Grand.
7701 10 Oct 2017 @ 1516 --- JSJ Castle off-camera, but patches of billowing steam consistent with an eruption first visible on web camera at 1516.
7532 29 Sep 2017 @ 0741 --- JimS Sloshing. Probably Had a minor eruption overnight.
7444 27 Sep 2017 @ 0903 --- JimS Sloshing. Had a second minor eruption overnight.
7258 25 Sep 2017 @ 0700 --- JimS Quiet. Had a major eruption overnight.
7027 23 Sep 2017 @ 0738 --- JimS Sloshing. Had a minor eruption overnight.
6749 18 Sep 2017 @ 0730 --- JimS Quiet. Had a major eruption overnight.
6628 17 Sep 2017 @ 0726 --- JimS Sloshing. Had a minor eruption overnight.
6364 14 Sep 2017 @ 0657 --- JimS Quiet. Had a major eruption overnight.
6271 11 Sep 2017 @ 0649 --- JimS Sloshing. Had a minor eruption overnight.
6263 10 Sep 2017 @ 1422 --- Betty Seems to be ie, but Castle is out of webcam view and only drifting steam is visible
5798 05 Sep 2017 @ 0631 --- JimS Quiet. Had a major eruption overnight.
5667 03 Sep 2017 @ 0804 --- JimS Sloshing. Had a minor eruption.
5568 02 Sep 2017 @ 0628 --- JimS Quiet. Had a major eruption overnight.
5398 26 Aug 2017 @ 0745 --- JimS Sloshing. Had a minor eruption.
5316 25 Aug 2017 @ 0625 --- JimS Quiet. Had a major eruption overnight.
5308 24 Aug 2017 @ 1446 --- LotusBaker castle is a major
5298 24 Aug 2017 @ 0600 --- JimS Quiet. Had a major eruption overnight.
5275 23 Aug 2017 @ 0610 23 Aug 2017 @ 0630 JimS Sloshing. Had a minor eruption early this morning.
5196 22 Aug 2017 @ 0616 --- JimS Quiet. Had a major eruption overnight.
4887 14 Aug 2017 @ 0640 --- JimS Quiet. Had a major eruption overnight.
4810 06 Aug 2017 @ 0553 --- JimS Quiet. Had a major eruption overnight.
4802 05 Aug 2017 @ 0600 --- JimS Quiet. Had a major eruption overnight.
4778 04 Aug 2017 @ 0616 --- EmilyW Sloshing, minored overnight
4753 03 Aug 2017 @ 0554 --- JimS Sloshing. overnight eruption was a minor.
4590 01 Aug 2017 @ 0711 --- JimS Apparently had a minor eruption early this morning.
4587 31 Jul 2017 @ 0831 --- EmilyW Sloshing, castle minored overnight
4532 25 Jul 2017 @ 0755 --- EmilyW Quiet, majored overnight
4520 24 Jul 2017 @ 0630 --- JimS Quiet. Had a major eruption overnight.
4507 20 Jul 2017 @ 0527 --- JimS Quiet. Had a major eruption overnight after the minor yesterday evening.
4475 17 Jul 2017 @ 0638 --- SteveO minor overninght
4471 16 Jul 2017 @ 0532 --- JimS Quiet. Had a major eruption overnight.
4465 15 Jul 2017 @ 0517 --- JimS Quiet. Had a major eruption sometime overnight.
4442 11 Jul 2017 @ 0632 --- JimS Quiet. Had a major eruption overnight.
4433 10 Jul 2017 @ 1441 --- udo Prediction from 724Victor = 1530 +/-45
4431 10 Jul 2017 @ 0630 --- JimS Quiet. Had a major eruption sometime overnight.
4407 05 Jul 2017 @ 0622 --- JimS Quiet. Had a major eruption sometime overnight.
4404 04 Jul 2017 @ 0550 --- JimS Sloshing. Had a minor eruption overnight.
4366 27 Jun 2017 @ 0524 --- JimS Quiet. Had a major eruption overnight.
4316 15 Jun 2017 @ 0625 --- B**2 Castle is in steam phase of eruption.
4187 03 Jun 2017 @ 0618 --- JimS Quiet. Had a major eruption sometime overnight.
4173 02 Jun 2017 @ 0655 02 Jun 2017 @ 0710 JimS Sloshing. Had a minor eruption sometime overnight.
4162 01 Jun 2017 @ 0612 --- JimS Quiet. Had a major eruption sometime overnight.
4155 31 May 2017 @ 0554 --- JimS Sloshing. Had a minor eruption sometime overnight.
4137 27 May 2017 @ 0620 --- SteveO Castle in very late steam phase, roaring and no water.
4116 23 May 2017 @ 0515 --- SteveO Major overnight, still a little forced steam.
4097 16 May 2017 @ 0541 --- JimS Sloshing. No major eruption yet.
4040 05 May 2017 @ 0545 --- JimS Quiet. Most recent eruption was a major
3924 24 Jan 2017 @ 2103 --- Casey Dark, but appears to be ie edit: still significant steam at 2207
3920 24 Jan 2017 @ 0629 --- Kitt B large steam cloud on cam, possibly ie, but too dark to see water
3904 29 Dec 2016 @ 1051 --- Kevin L Very foggy but it looked like Castle may have been ie. Fog downbasin may have been the result of a Castle eruption since it appeared that there was a steam phase plume at 1118 and the fog cleared shortly after that.
3780 13 Oct 2016 @ 1200 --- udo Castle has been jetting frequently 6 to 20 feet all afternoon as if it had a minor. It was quiet earlier in the morning. A bit odd.
3765 09 Oct 2016 @ 0759 --- Kitt B Castle had a major before 7am, boardwalk icy, path wet, and Castle quiet.
3733 01 Oct 2016 @ 0843 --- Kitt B Castle minored
3730 30 Sep 2016 @ 0530 --- Kitt B Dan told me he heard Castle in steam phase. I saw some splashing from Castle, but then I left the basin to check on Great Fountain.
3689 19 Sep 2016 @ 2320 --- Casey Webcam observer mentioned short period of activity. If found to have had a minor eruption overnight, it was probably ie 2320.
3683 18 Sep 2016 @ 0645 --- JimS Quiet. Had a major eruption sometime overnight.
3665 15 Sep 2016 @ 0638 --- JimS Still sloshing from minor.
3657 14 Sep 2016 @ 0648 --- JimS Sloshing. Had a minor eruption sometime overnight.
3654 13 Sep 2016 @ 0642 --- JimS Quiet. Had a major eruption sometime overnight.
3649 12 Sep 2016 @ 0649 --- JimS Quiet. Had a major eruption sometime overnight.
3642 11 Sep 2016 @ 0636 --- JimS Sloshing. Had a minor eruption sometime overnight.
3591 02 Sep 2016 @ 0612 --- JimS Quiet. Had a major eruption sometime overnight.
3583 01 Sep 2016 @ 0610 --- JimS Quiet. Had a major eruption sometime overnight.
3587 31 Aug 2016 @ 2337 --- JarnoO Might've erupted. If so, then it was a major (see note by JimS @ 0610).
3573 30 Aug 2016 @ 0612 --- JimS Sloshing. Had a minor eruption sometime overnight.
3568 29 Aug 2016 @ 0607 --- JimS Quiet. Had a major eruption sometime overnight.
3570 29 Aug 2016 @ 0015 --- JarnoO Might've erupted. If so, then it was a major (see note that was submitted @ 0607)
3559 28 Aug 2016 @ 0611 --- JimS Quiet. Had a major eruption sometime overnight.
3553 27 Aug 2016 @ 0607 --- JimS Quiet. Had a major eruption sometime overnight.
3543 26 Aug 2016 @ 0624 --- JimS Quiet. Had a major eruption sometime overnight.
3486 13 Aug 2016 @ 0544 --- JimS Sloshing. Had a minor eruption sometime overnight.
3444 08 Aug 2016 @ 0547 --- JimS Quiet. Had a major eruption overnight. Might have been the eruption reported late last evening.
3431 06 Aug 2016 @ 0534 --- JimS Sloshing. Had a minor eruption sometime overnight.
3382 28 Jul 2016 @ 0534 --- JimS Sloshing. Had a minor eruption overnight.
3162 01 Jul 2016 @ 0513 --- JimS Quiet. Had a major eruption sometime overnight.
EntrySourceLinkComment
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
16 Sep 2007 @ 1841 Micah Kipple https://www.flickr.com/photos/130216833@N06/16100193606 flickr
BaselineDistance (ft)Description
Bike Path 200On the side of the bike path south of the geyser.


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