San Antonio has many organizations devoted to conserving the environment and exploring the outdoors. Monthly meetings feature presentations from speakers who have expertise on a wide variety of topics and attending a meeting could be one of the most informative activities in San Antonio whether you are a visitor or resident. Some of the nature clubs offer San Antonio things to do such as field trips, feature film showings and special events for both members and guests. Visit their websites to learn more. (Due to COVID-19 restrictions, organizations are now holding their meetings and presentations online.)
San Antonio Audubon Society
Established in 1954, San Antonio Audubon Society is a local club dedicated to conservation and birding. The group currently meets online at 7 PM on the first Thursday of each month and features a guest speaker's presentation. Birdwatching field trips can be found on the website.
The Alamo Group of the Sierra Club
The Sierra Club is America's oldest, largest, and most influential 
grassroots environmental organization. The local chapter meets the third Tuesday of the month and meetings are free and open to the public. A schedule of outdoor activities and special events is posted on their Meetup page.
Alamo Area Master Naturalists
The Master Naturalist organization was founded in San Antonio in 1998, paving the way for chapters to form around the country. The group provides training for volunteers who focus on the preservation, conservation and restoration of the local area’s indigenous plants, animals and geological features of the region. Training classes are offered once a year. General meetings are held on the first Tuesday of the month.
Bexar Audubon Society
Bexar Audubon Society is the National Audubon Society chapter for San Antonio and surrounding counties. The organization's mission is to promote the conservation of habitat for birds and other wildlife, support National Audubon Society’s efforts, and encourage responsible local action through education, research, and advocacy. The group has a robust schedule of online presentations and a wealth of birding information on their website.
Native Plant Society
The Native Plant Society of San Antonio's mission is to unite volunteers in protecting our state’s native plant heritage and preserve it for future generations. Their online meetings with speaker presentations are held on the fourth Tuesday of the month except for August, November and December. The group also sponsors a native plant sale and schedules walks and other events that focus on native plants.