A king tide is the highest water level within a year that is produced by the orbits and alignments of the Earth, Moon and Sun. It is the highest high tide of the year. (However, winds, storms, floods, or other local conditions may result in another day of the year ending up with the highest water level.)
Sea level rise will make today's king tides become the future's everyday tides.
King tides in October (68 of 120 stations)
King tides in September (20)
King tides in July (8)
King tides in the other nine months (24)
The days around the Full Moon of, 2015 Oct 27 12:05 UT, are when most of the Atlantic and Gulf Coast locations have their 2015 king tide. The Full Moon of, 2015 Sep 28 02:50 UT is also generating a number of king tides. Of the locations with September king tides, 9 of 20 have their second highest tide in late October. Most of the locations that have king tides in other months are up bays or rivers or have other special tidal geography (check the date of their 2nd highest tide).
Showing locations in the NOAA station list with a Mean Higher High Water (MHHW) at least 1 foot above MLLW. MHHW is the height of the highest water level on an average day.
One tide will be the highest and if you click on a marker you will learn when it is. However it is not necessarily highest by a wide margin and other high tides can be very close in height.
Time is in 24-hour format so watch your a.m.'s and p.m.'s. The NOAA webserver returns dates and times in Local Standard Time! Be sure to apply any necessary DST offset to find out what time the high tide is. If the king tide is between 11 p.m. and midnight be sure you get the date right for any DST correction too.
Tide predictions are from http://opendap.co-ops.nos.noaa.gov/axis/webservices/highlowtidepred/index.jsp
The NOAA webserver returns tides to 0.001 ft. The tide station pages report MHHW to 1 mm. 1 mm = 0.0033 feet. This page reports its calculations to 1/1000 of a foot; use whatever precision you like.
I did my best: please double check everything before you do anything ambitious. Links are provided! Send any corrections via e-mail c/o "info" at this domain.