1940  SNHA is established and sells $530 in books and publications
1942-1945  SNHA business on hold due to the war
1946  SNHA resumes business and publishes first book, Crystal Cave
1969  NPS Chief Interpreter, John Palmer, assumes the role of SNHA executive secretary
1973  Staff grows to two full time employees
1976  Publication revenue $68,000
1977  SNHA assists NPS with the operation of the Pear Lake Ski Hut
1978  SNHA takes over the operation of Crystal Cave
1979  Field Seminar program is established with 6 courses
1980  Membership program begins and reaches 200 members
1981  SNHA provides financial support to open Walter Fry Nature Center in Lodgepole
1982  Crystal Cave ticket booth gets constructed
1984  John Palmer publishes the first Seedlings newsletter
1985  Publication revenue $241,000
1986  SNHA provides $10,000 to create the Sequoia and Kings Canyon National Parks Foundation
1987  John Palmer becomes the first executive director
1988  First annual SNHA membership meeting and picnic
1989  SNHA opens office building at Ash Mountain
1990  Publication revenue $395,000 and membership exceeds 600 members
1991  Challenge of the Big Trees is published
1992  Tyler Conrad joins SNHA as second executive director
1993  SNHA starts bear-resistant canister rental program
1994  SNHA hires first visitor center employee
1995  Number of items offered for sale exceeds 700
1996  Mark Tilchen selected as SNHA’s third executive director
1997  SNHA establishes its own website and mail order service
1998  SNHA announces plans to operate the Beetle Rock Education Center
1998  Visitor center staff grows to 8 employees (SNHA hires its first employee for Devils Postpile)
1998  Field seminar program grows to 24 courses
1998  SNHA takes over full operation of the Pear Lake Ski Hut from NPS
2001  First Education Director is hired
2001  Sequoia Field Institute is created
2001  SNHA begins repairs and remodel for the Beetle Rock Education Center
2002  Beetle Rock Education Center opens
2002  SNHA opens new bookstore in Giant Forest Museum
2003  SNHA partners with U.S. Army Corps of Engineers at Lake Kaweah
2003  SFI begins to lead backpacking trips for WildLink
2003  SNHA opens the Sierra Nature Store in Visalia through 2004
2005  Office is enlarged to allow more room for book distribution
2005  SNHA creates a marketing department to promote the association and the parks
2006  SNHA opens Children’s Bookstore as part of the NPS Beetle Rock Family Nature Center
2006  Visitor Center staff increases to 18 employees and membership exceeds 2500
2007  SNHA purchases a Toyota Prius for the National Park Service motor pool
2008  SNHA funds the NPS Junior Ranger program– making it free to park visitors
2009  SNHA and NPS begin a solar generation project at Crystal Cave
2010  Celebrating 70 years helping the parks
2011  Funding is received to host "Sequoia Summer Service Weeks"
2012  Created "Kids Konnect" wholesale department

2013  SNHA continued to support the parks during the government shutdown
2014  SNHA presents the first annual Dark Sky Festival