1810 Ezra Carter Gross and William Ray publish the county's first weekly newspaper, The Reveille, in Elizabethtown.
1835 Painter Thomas Cole visits Schroon Lake during "an excursion in search of the picturesque toward the headwaters of the Hudson."
1839 Charles Fenno Hoffman's Wild Scenes in the Forest is published in England.
1870 Au Sable Chasm is operated as a tourist attraction.
1874 Seneca Ray Stoddard publishes his first edition of The Adirondacks: Illustrated
1874 James Putnam, Charles Putnam, Henry Bowditch, and William James visit Keene Valley. They return the following summer and purchase land for what becomes known as Putnam Camp.
1886 Camp Dudley offers summer camp activities in Westport.
1886 The Adirondack Preserve Association for the Encouragement of Social Pastimes and the Preservation of Game Forests, later renamed the Northwoods Club, is incorporated in the Town of Minerva.
1890 The Glenmore School for the Cultural Sciences is established by Thomas Davidson in Keene.
1895 The Lake Placid Club is organized.
1899 Conservationist John Bird Burnham establishes the Crater Club on Whallon's Bay on Lake Champlain.
1915 Oscar Seagle establishes a studio for vocal training at the Brown Swan Club in Schroon Lake.
1915 The Alaska Silver Fox Farm opens near AuSable Chasm.
1920 The Law of the Yukon is filmed at Artic City studio in Port Henry.
1924 An estimated 10,000 people attend the National Woman's Party pageant at Meadowmount in Lewis honoring the memory of Essex County suffragist Inez Milholland.
1931 Jones Brook is dammed by the Town of Minerva to create a 100-acre, artificial lake.
1932 Lake Placid hosts its first Winter Olympic Games.
1932 Portrait painter Wayman Adams establishes the Old Mill Art School in Elizabethtown.
1934 The Adirondack Mountain Club publishes Orra Phelps' A Guide to Adirondack Trails.
1937 The Forty-Sixers is organized in Troy, New York.
1944 Ivan Galamian establishes the Society for Strings' Meadowmount School of Music in Lewis.
Santa's Workshop opens in Wilmington.
1954 The Essex County Historical Society is formed.
1958 Whiteface Ski Center Opens.
1980 Lake Placid hosts its second Winter Olympic Games.