Today's tide times for Castle Island, Boston Harbor, Massachusetts
The predicted tide times today on Sunday 27 April 2025 for Castle Island, Boston Harbor are: first low tide at 5:18am, first high tide at 11:28am, second low tide at 5:35pm, second high tide at 11:44pm. Sunrise is at 5:44am and sunset is at 7:39pm.
Today's tide times for Castle Island, Boston Harbor: Sunday 27 April 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
Low Tide | 5:18 AM(Sun 27 April) | -1.48 ft (-0.45 m) |
High Tide | 11:28 AM(Sun 27 April) | 10.82 ft (3.3 m) |
Low Tide | 5:35 PM(Sun 27 April) | -0.8 ft (-0.24 m) |
High Tide | 11:44 PM(Sun 27 April) | 11.99 ft (3.65 m) |
- Wind Speed
- Swell
- Weather
Tide chart for Castle Island, Boston HarborShowing low and high tide times for the next 30 days at Castle Island, Boston Harbor. Tide Times are EDT (UTC -4.0hrs).
View Castle Island, Boston Harbor 7 Day Tide Chart Image.


HIGH (EDT) |
LOW (EDT) |
Sun |
Moon Set Rise |
Wind |
Sunday, 27 Apr | 28 Apr | 29 Apr | 30 Apr | 1 May | 2 May | 3 May | 4 May | 5 May | 6 May | 7 May | 8 May | 9 May | 10 May | 11 May | 12 May | 13 May | 14 May | 15 May | 16 May | 17 May | 18 May | 19 May | 20 May | 21 May | 22 May | 23 May | 24 May | 25 May | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
AM | PM | Mon | Tue | Wed | Thu | Fri | Sat | Sun | Mon | Tue | Wed | Thu | Fri | Sat | Sun | Mon | Tue | Wed | Thu | Fri | Sat | Sun | Mon | Tue | Wed | Thu | Fri | Sat | Sun | ||
5:18AM -1.5ft 11:28AM 10.8ft 5:35PM -0.8ft 11:44PM 12ft | |||||||||||||||||||||||||||||||
11:28AM10.83ft | 11:44PM11.98ft | 12:20PM10.83ft | 00:33AM12.17ft 1:12PM10.63ft | 1:23AM12.07ft 2:05PM10.27ft | 2:15AM11.71ft 3:00PM9.81ft | 3:10AM11.16ft 3:58PM9.35ft | 4:09AM10.5ft 5:00PM8.92ft | 5:12AM9.88ft 6:04PM8.69ft | 6:17AM9.38ft 7:07PM8.69ft | 7:23AM9.12ft 8:07PM8.83ft | 8:25AM8.99ft 8:58PM9.09ft | 9:19AM8.96ft 9:44PM9.35ft | 10:08AM8.96ft 10:24PM9.58ft | 10:51AM8.99ft 11:01PM9.78ft | 11:32AM8.99ft 11:37PM9.91ft | 12:11PM8.96ft | 00:13AM9.97ft 12:48PM8.89ft | 00:49AM9.97ft 1:27PM8.79ft | 1:27AM9.94ft 2:07PM8.66ft | 2:06AM9.84ft 2:48PM8.53ft | 2:48AM9.74ft 3:32PM8.43ft | 3:34AM9.65ft 4:20PM8.46ft | 4:24AM9.55ft 5:10PM8.63ft | 5:19AM9.48ft 6:03PM8.92ft | 6:17AM9.51ft 6:57PM9.42ft | 7:17AM9.61ft 7:51PM10.01ft | 8:16AM9.74ft 8:43PM10.66ft | 9:15AM9.97ft 9:36PM11.25ft | 10:12AM10.14ft 10:28PM11.75ft | ||
5:18AM-1.48ft | 5:35PM-0.79ft | 6:09AM-1.87ft 6:24PM-0.75ft | 7:01AM-1.97ft 7:13PM-0.56ft | 7:53AM-1.77ft 8:04PM-0.16ft | 8:46AM-1.31ft 8:58PM0.33ft | 9:41AM-0.69ft 9:54PM0.89ft | 10:40AM-0.03ft 10:55PM1.38ft | 11:42AM0.52ft 11:59PM1.71ft | 12:45PM0.92ft | 1:06AM1.77ft 1:45PM1.12ft | 2:10AM1.64ft 2:40PM1.21ft | 3:07AM1.38ft 3:28PM1.25ft | 3:57AM1.05ft 4:10PM1.25ft | 4:41AM0.75ft 4:49PM1.28ft | 5:21AM0.52ft 5:26PM1.28ft | 5:59AM0.36ft 6:03PM1.35ft | 6:36AM0.3ft 6:41PM1.41ft | 7:15AM0.3ft 7:20PM1.51ft | 7:54AM0.39ft 8:00PM1.61ft | 8:36AM0.49ft 8:42PM1.74ft | 9:19AM0.59ft 9:28PM1.84ft | 10:06AM0.66ft 10:17PM1.84ft | 10:55AM0.69ft 11:12PM1.74ft | 11:48AM0.66ft | 00:10AM1.48ft 12:42PM0.52ft | 1:10AM1.02ft 1:37PM0.36ft | 2:09AM0.39ft 2:31PM0.16ft | 3:07AM-0.3ft 3:24PM-0.03ft | 4:04AM-0.92ft 4:17PM-0.2ft | ||
5:44AM | 7:39PM | 5:43AM 7:40PM | 5:41AM 7:41PM | 5:40AM 7:42PM | 5:38AM 7:44PM | 5:37AM 7:45PM | 5:36AM 7:46PM | 5:35AM 7:47PM | 5:33AM 7:48PM | 5:32AM 7:49PM | 5:31AM 7:50PM | 5:30AM 7:51PM | 5:28AM 7:52PM | 5:27AM 7:53PM | 5:26AM 7:54PM | 5:25AM 7:55PM | 5:24AM 7:56PM | 5:23AM 7:58PM | 5:22AM 7:59PM | 5:21AM 8:00PM | 5:20AM 8:01PM | 5:19AM 8:02PM | 5:18AM 8:03PM | 5:17AM 8:04PM | 5:16AM 8:05PM | 5:16AM 8:05PM | 5:15AM 8:06PM | 5:14AM 8:07PM | 5:13AM 8:08PM | ||
5:19AM | 7:56PM | 9:21PM 5:51AM | 10:43PM 6:30AM | 11:55PM 7:20AM | 8:21AM | 00:53AM 9:30AM | 1:37AM 10:43AM | First Quarter 2:11AM 11:54AM | 2:38AM 1:02PM | 3:00AM 2:07PM | 3:19AM 3:10PM | 3:37AM 4:11PM | 3:54AM 5:12PM | 4:12AM 6:15PM | 4:33AM 7:18PM | Full Moon 4:58AM 8:23PM | 5:27AM 9:27PM | 6:04AM 10:28PM | 6:50AM 11:23PM | 7:45AM | 8:49AM 00:10AM | 9:58AM 00:48AM | 11:09AM 1:19AM | Last Quarter 12:21PM 1:46AM | 1:34PM 2:09AM | 2:48PM 2:31AM | 4:05PM 2:53AM | 5:25PM 3:17AM | 6:49PM 3:45AM | ||

Castle Island, Boston Harbor tide chart key:
The tide chart above shows the height and times of high tide and low tide for Castle Island, Boston Harbor, Massachusetts. The red flashing dot shows the tide time right now. The grey shading corresponds to nighttime hours between sunset and sunrise at Castle Island, Boston Harbor.
Tide Times are EDT (UTC -4.0hrs). Last Spring High Tide at Castle Island, Boston Harbor was on Sun 13 Apr (height: 3.04m 10.0ft). Next high Spring Tide at Castle Island, Boston Harbor will be on Mon 28 Apr (height: 3.71m 12.2ft).
Castle Island, Boston Harbor tide chart key: The tide chart above shows the height and times of high tide and low tide for Castle Island, Boston Harbor, Massachusetts. The grey shading corresponds to nighttime hours between sunset and sunrise at Castle Island, Boston Harbor.
Tide Times are EDT (UTC -4.0hrs). Last Spring High Tide at Castle Island, Boston Harbor was on Sun 13 Apr (height: 3.04m 10.0ft). Next high Spring Tide at Castle Island, Boston Harbor will be on Mon 28 Apr (height: 3.71m 12.2ft).
Castle Island, Boston Harbor tide times for April and May
April and May Tide charts for Castle Island, Boston Harbor: The tide charts below show the height, time and date of high and low tides for the next 30 days.
Tide Times for Castle Island, Boston Harbor (tomorrow): Monday 28 April 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
Low Tide | 6:09 AM(Mon 28 April) | -1.88 ft (-0.57 m) |
High Tide | 12:20 PM(Mon 28 April) | 10.83 ft (3.3 m) |
Low Tide | 6:24 PM(Mon 28 April) | -0.77 ft (-0.23 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Tuesday 29 April 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
High Tide | 00:33 AM(Tue 29 April) | 12.18 ft (3.71 m) |
Low Tide | 7:01 AM(Tue 29 April) | -1.98 ft (-0.6 m) |
High Tide | 1:12 PM(Tue 29 April) | 10.64 ft (3.24 m) |
Low Tide | 7:13 PM(Tue 29 April) | -0.55 ft (-0.17 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Wednesday 30 April 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
High Tide | 1:23 AM(Wed 30 April) | 12.07 ft (3.68 m) |
Low Tide | 7:53 AM(Wed 30 April) | -1.77 ft (-0.54 m) |
High Tide | 2:05 PM(Wed 30 April) | 10.28 ft (3.13 m) |
Low Tide | 8:04 PM(Wed 30 April) | -0.17 ft (-0.05 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Thursday 01 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
High Tide | 2:15 AM(Thu 01 May) | 11.7 ft (3.57 m) |
Low Tide | 8:46 AM(Thu 01 May) | -1.3 ft (-0.4 m) |
High Tide | 3:00 PM(Thu 01 May) | 9.82 ft (2.99 m) |
Low Tide | 8:58 PM(Thu 01 May) | 0.34 ft (0.1 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Friday 02 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
High Tide | 3:10 AM(Fri 02 May) | 11.14 ft (3.4 m) |
Low Tide | 9:41 AM(Fri 02 May) | -0.68 ft (-0.21 m) |
High Tide | 3:58 PM(Fri 02 May) | 9.34 ft (2.85 m) |
Low Tide | 9:54 PM(Fri 02 May) | 0.89 ft (0.27 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Saturday 03 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
High Tide | 4:09 AM(Sat 03 May) | 10.49 ft (3.2 m) |
Low Tide | 10:40 AM(Sat 03 May) | -0.03 ft (-0.01 m) |
High Tide | 5:00 PM(Sat 03 May) | 8.94 ft (2.73 m) |
Low Tide | 10:55 PM(Sat 03 May) | 1.37 ft (0.42 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Sunday 04 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
High Tide | 5:12 AM(Sun 04 May) | 9.88 ft (3.01 m) |
Low Tide | 11:42 AM(Sun 04 May) | 0.53 ft (0.16 m) |
High Tide | 6:04 PM(Sun 04 May) | 8.71 ft (2.65 m) |
Low Tide | 11:59 PM(Sun 04 May) | 1.69 ft (0.52 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Monday 05 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
High Tide | 6:17 AM(Mon 05 May) | 9.4 ft (2.86 m) |
Low Tide | 12:45 PM(Mon 05 May) | 0.91 ft (0.28 m) |
High Tide | 7:07 PM(Mon 05 May) | 8.69 ft (2.65 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Tuesday 06 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
Low Tide | 1:06 AM(Tue 06 May) | 1.78 ft (0.54 m) |
High Tide | 7:23 AM(Tue 06 May) | 9.11 ft (2.78 m) |
Low Tide | 1:45 PM(Tue 06 May) | 1.12 ft (0.34 m) |
High Tide | 8:07 PM(Tue 06 May) | 8.84 ft (2.69 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Wednesday 07 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
Low Tide | 2:10 AM(Wed 07 May) | 1.64 ft (0.5 m) |
High Tide | 8:25 AM(Wed 07 May) | 8.98 ft (2.74 m) |
Low Tide | 2:40 PM(Wed 07 May) | 1.21 ft (0.37 m) |
High Tide | 8:58 PM(Wed 07 May) | 9.09 ft (2.77 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Thursday 08 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
Low Tide | 3:07 AM(Thu 08 May) | 1.37 ft (0.42 m) |
High Tide | 9:19 AM(Thu 08 May) | 8.95 ft (2.73 m) |
Low Tide | 3:28 PM(Thu 08 May) | 1.24 ft (0.38 m) |
High Tide | 9:44 PM(Thu 08 May) | 9.35 ft (2.85 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Friday 09 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
Low Tide | 3:57 AM(Fri 09 May) | 1.05 ft (0.32 m) |
High Tide | 10:08 AM(Fri 09 May) | 8.97 ft (2.73 m) |
Low Tide | 4:10 PM(Fri 09 May) | 1.25 ft (0.38 m) |
High Tide | 10:24 PM(Fri 09 May) | 9.59 ft (2.92 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Saturday 10 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
Low Tide | 4:41 AM(Sat 10 May) | 0.76 ft (0.23 m) |
High Tide | 10:51 AM(Sat 10 May) | 8.99 ft (2.74 m) |
Low Tide | 4:49 PM(Sat 10 May) | 1.27 ft (0.39 m) |
High Tide | 11:01 PM(Sat 10 May) | 9.79 ft (2.98 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Sunday 11 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
Low Tide | 5:21 AM(Sun 11 May) | 0.52 ft (0.16 m) |
High Tide | 11:32 AM(Sun 11 May) | 8.99 ft (2.74 m) |
Low Tide | 5:26 PM(Sun 11 May) | 1.29 ft (0.39 m) |
High Tide | 11:37 PM(Sun 11 May) | 9.92 ft (3.02 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Monday 12 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
Low Tide | 5:59 AM(Mon 12 May) | 0.36 ft (0.11 m) |
High Tide | 12:11 PM(Mon 12 May) | 8.97 ft (2.73 m) |
Low Tide | 6:03 PM(Mon 12 May) | 1.33 ft (0.41 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Tuesday 13 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
High Tide | 00:13 AM(Tue 13 May) | 9.99 ft (3.04 m) |
Low Tide | 6:36 AM(Tue 13 May) | 0.29 ft (0.09 m) |
High Tide | 12:48 PM(Tue 13 May) | 8.89 ft (2.71 m) |
Low Tide | 6:41 PM(Tue 13 May) | 1.4 ft (0.43 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Wednesday 14 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
High Tide | 00:49 AM(Wed 14 May) | 9.99 ft (3.04 m) |
Low Tide | 7:15 AM(Wed 14 May) | 0.3 ft (0.09 m) |
High Tide | 1:27 PM(Wed 14 May) | 8.78 ft (2.68 m) |
Low Tide | 7:20 PM(Wed 14 May) | 1.5 ft (0.46 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Thursday 15 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
High Tide | 1:27 AM(Thu 15 May) | 9.94 ft (3.03 m) |
Low Tide | 7:54 AM(Thu 15 May) | 0.38 ft (0.12 m) |
High Tide | 2:07 PM(Thu 15 May) | 8.65 ft (2.64 m) |
Low Tide | 8:00 PM(Thu 15 May) | 1.62 ft (0.49 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Friday 16 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
High Tide | 2:06 AM(Fri 16 May) | 9.85 ft (3.0 m) |
Low Tide | 8:36 AM(Fri 16 May) | 0.48 ft (0.15 m) |
High Tide | 2:48 PM(Fri 16 May) | 8.52 ft (2.6 m) |
Low Tide | 8:42 PM(Fri 16 May) | 1.73 ft (0.53 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Saturday 17 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
High Tide | 2:48 AM(Sat 17 May) | 9.74 ft (2.97 m) |
Low Tide | 9:19 AM(Sat 17 May) | 0.58 ft (0.18 m) |
High Tide | 3:32 PM(Sat 17 May) | 8.44 ft (2.57 m) |
Low Tide | 9:28 PM(Sat 17 May) | 1.83 ft (0.56 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Sunday 18 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
High Tide | 3:34 AM(Sun 18 May) | 9.64 ft (2.94 m) |
Low Tide | 10:06 AM(Sun 18 May) | 0.66 ft (0.2 m) |
High Tide | 4:20 PM(Sun 18 May) | 8.46 ft (2.58 m) |
Low Tide | 10:17 PM(Sun 18 May) | 1.85 ft (0.56 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Monday 19 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
High Tide | 4:24 AM(Mon 19 May) | 9.54 ft (2.91 m) |
Low Tide | 10:55 AM(Mon 19 May) | 0.69 ft (0.21 m) |
High Tide | 5:10 PM(Mon 19 May) | 8.62 ft (2.63 m) |
Low Tide | 11:12 PM(Mon 19 May) | 1.75 ft (0.53 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Tuesday 20 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
High Tide | 5:19 AM(Tue 20 May) | 9.49 ft (2.89 m) |
Low Tide | 11:48 AM(Tue 20 May) | 0.65 ft (0.2 m) |
High Tide | 6:03 PM(Tue 20 May) | 8.94 ft (2.72 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Wednesday 21 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
Low Tide | 00:10 AM(Wed 21 May) | 1.48 ft (0.45 m) |
High Tide | 6:17 AM(Wed 21 May) | 9.51 ft (2.9 m) |
Low Tide | 12:42 PM(Wed 21 May) | 0.54 ft (0.16 m) |
High Tide | 6:57 PM(Wed 21 May) | 9.42 ft (2.87 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Thursday 22 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
Low Tide | 1:10 AM(Thu 22 May) | 1.02 ft (0.31 m) |
High Tide | 7:17 AM(Thu 22 May) | 9.6 ft (2.93 m) |
Low Tide | 1:37 PM(Thu 22 May) | 0.37 ft (0.11 m) |
High Tide | 7:51 PM(Thu 22 May) | 10.02 ft (3.05 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Friday 23 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
Low Tide | 2:09 AM(Fri 23 May) | 0.4 ft (0.12 m) |
High Tide | 8:16 AM(Fri 23 May) | 9.76 ft (2.97 m) |
Low Tide | 2:31 PM(Fri 23 May) | 0.16 ft (0.05 m) |
High Tide | 8:43 PM(Fri 23 May) | 10.66 ft (3.25 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Saturday 24 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
Low Tide | 3:07 AM(Sat 24 May) | -0.28 ft (-0.09 m) |
High Tide | 9:15 AM(Sat 24 May) | 9.96 ft (3.04 m) |
Low Tide | 3:24 PM(Sat 24 May) | -0.04 ft (-0.01 m) |
High Tide | 9:36 PM(Sat 24 May) | 11.26 ft (3.43 m) |
Powered by Tide-Forecast.com
Tide Times for Castle Island, Boston Harbor: Sunday 25 May 2025
Tide | Time (EDT)& Date | Height |
---|---|---|
Low Tide | 4:04 AM(Sun 25 May) | -0.91 ft (-0.28 m) |
High Tide | 10:12 AM(Sun 25 May) | 10.13 ft (3.09 m) |
Low Tide | 4:17 PM(Sun 25 May) | -0.19 ft (-0.06 m) |
High Tide | 10:28 PM(Sun 25 May) | 11.73 ft (3.58 m) |
Powered by Tide-Forecast.com
NOTE: Use of this site for Castle Island, Boston Harbor, Massachusetts tide times is subject to our terms.
NOTE: We do not accept responsibility for any amendments or changes to the data whilst it is displayed / printed from our website.