According to Winnipesaukee.com, "Ice-Out" on Lake Winnipesaukee is the moment when the ice that has covered the Lake since late December or early January melts enough that the M/S Mount Washington cruise ship could navigate between its ports in Alton Bay, Center Harbor, Weirs Beach, Meredith and Wolfeboro.

Ice-Out is anxiously awaitied by residents and visitors since it is the traditional start of the spring season and many Islanders regain water access to their cottages. The date has been observed and recorded for over 135 years. The setting of the exact date and time is non-scientific and is now determined by an observer in a small plane from Emerson Aviation that flies over the lake several times a day. When the pilot makes the Ice-Out call it is considered official."

 

Ice-Outs by Date

Date	Graph	Years
March 18	X	2016
March 23	X	2012
March 24	X	2010
March 28	X	1921
March 30	X	1946
April 1	X	1945
April 2	X	1903
April 3	XXX	1953,1957, 2006
April 4	X	1902
April 5	XX	1981,2002
April 6	XX	1910,2020
April 7	XX	1930,1998
April 8	XXXX	1936,1949,1991,1999
April 10	XXXX	1925,1948,1983,2000
April 11	XX	1892,1931
April 12	XX	1987,2009
April 13	XX	1927,1958
April 14	XXXX	1889,1898,1951,1985
April 15	XXX	1914,1968,1995
April 16	XXXXXXXX	1916,1941,1954,1973,1974,1976,1986,1988
April 17	XXXXXXX	1913,1922,1938,1980,1996,2013,2017
April 18	XXX	1924,1929,1942
April 19	XXXXX	1909,1928,1955,1960,2011
April 20	XXXXXXXXXXX	1894,1901,1932,1950,1952,1963,1966,1967,1984,2004,2005
April 21	XXXX	1908,1934,1935,1992
April 22	XXX	1965,1990,1993
April 23	XXXXXXXXX	1891,1896,1897,1912,1977,1994, 2007,2008,2014
April 24	XXXXXXXXXXXX	1890,1905,1915,1918,1919,1920,1923,1947,1962,1997,2015,2019
April 25	XXXXXX	1933,1937,1969,1975,1989,2003
April 26	XXXXXX	1895,1900,1906,1959,1979,2018
April 27	XX	1961,1978
April 28	XXX	1917,1964,1970
April 29	XXX	1904,1907,1982
April 30	X	1943
May 2	XXXXX	1899,1911,1926,1972,2001
May 3	X	1944
May 4	XX	1939,1940
May 5	X	1956
May 6	X	1971
May 7	X	1887
May 10	X	1893
May 12	X	1888

Ice-Outs by Year

Year Date 1887 May 7 1888 May 12 1889 April 14 1890 April 24 1891 April 23 1892 April 11 1893 May 10 1894 April 20 1895 April 26 1896 April 23 1897 April 23 1898 April 14 1899 May 2 1900 April 26 1901 April 20 1902 April 4 1903 April 2 1904 April 29 1905 April 24 1906 April 26 1907 April 29 1908 April 21 1909 April 19 1910 April 6 1911 May 2 1912 April 23 1913 April 17 1914 April 15 1915 April 24 1916 April 16 1917 April 28 1918 April 24 1919 April 24 1920 April 24 1921 March 28 1922 April 17 1923 April 24 1924 April 18 1925 April 10 1926 May 2 1927 April 13

Year Date 1928 April 19 1929 April 18 1930 April 7 1931 April 11 1932 April 20 1933 April 25 1934 April 21 1935 April 21 1936 April 8 1937 April 25 1938 April 17 1939 May 4 1940 May 4 1941 April 16 1942 April 18 1943 April 30 1944 May 3 1945 April 1 1946 March 30 1947 April 24 1948 April 10 1949 April 8 1950 April 20 1951 April 14 1952 April 20 1953 April 3 1954 April 16 1955 April 19 1956 May 5 1957 April 3 1958 April 13 1959 April 26 1960 April 19 1961 April 27 1962 April 24 1963 April 20 1964 April 28 1965 April 22 1966 April 20 1967 April 20 1968 April 15

Year Date 1969 April 25 1970 April 28 1971 May 6 1972 May 2 1973 April 16 1974 April 16 1975 April 25 1976 April 16 1977 April 23 1978 April 27 1979 April 26 1980 April 17 1981 April 5 1982 April 29 1983 April 10 1984 April 20 1985 April 14 1986 April 16 1987 April 12 1988 April 16 1989 April 25 1990 April 22 1991 April 8 1992 April 21 1993 April 22 1994 April 23 1995 April 15 1996 April 17 1997 April 24 1998 April 7 1999 April 8 2000 April 10 2001 May 2 2002 April 5 2003 April 25 2004 April 20 2005 April 20 2006 April 3 2007 April 23 2008 April 23 2009 April 12

Year Date 2010 March 24 2011 April 19 2012 March 23 2013 April 17 2014 April 23 2015 April 24 2016 March 18 2017 April 17 2018 April 26 2019 April 24 2020 April 6 2021 ?