Free days & verified discounts in Los Angeles, California

California State Library Parks Pass — free vehicle day-use pass to borrow — Los Angeles State Historic ParkLibrary card holders can check out a free vehicle day-use pass at their local public library; valid for entry of one passenger vehicle (capacity up to 9) or one highway-licensed motorcycle at 200+ participating state park units. Loan period is set by the local library. Not valid for per-person entry or tour fees, boat use, camping, group use, special events or extra vehicles, or at units run by federal/local/private concessionaires — confirm this park is a participating unit before relying on it. (Entry to this park is already free; the pass covers its paid parking lot.)
Source: https://www.parks.ca.gov/?page_id=30806

Discover & Go (LA County Library) — free admission passes — Natural History Museum of Los Angeles CountyLA County Library cardholders can reserve free general admission for up to two adults and four children through the Discover & Go portal on the library site; the museum's own pages confirm these terms for NHM (and La Brea Tar Pits). Reserve in advance; passes are limited.
Source: https://lacountylibrary.org/

Museums for All — free admission with an EBT card — Natural History Museum of Los Angeles CountyEBT cardholders with ID receive free daily general admission for up to two adults and four children; the museum describes itself (and La Brea Tar Pits) as a Museums for All member. Parking and special exhibitions/pavilions are extra.
Source: https://nhm.org/free-hours-and-admission

LA County residents — free weekday late afternoons — Natural History Museum of Los Angeles CountyResidents of Los Angeles County receive free general admission Monday–Friday 3–5pm with ID or a utility bill showing a county address (museum's official free-admission page). CA teachers with school ID and active/retired military are also free daily per the same page.
Source: https://nhm.org/free-hours-and-admission

Discover & Go (Los Angeles Public Library) — free zoo admission for up to four — Los Angeles ZooThe zoo's own deals page states that L.A. Public Library card holders can use the library's Discover & Go program for free LA Zoo admission for up to four people. Reserve through lapl.org in advance; availability is limited and passes release periodically.
Source: https://www.lazoo.org/

Bank of America Museums on Us — free first full weekend monthly — Los Angeles County Museum of Art (LACMA)Bank of America debit/credit cardholders receive free general admission on the first full weekend of every month (official LACMA tickets page). Cardholder only; timed ticket still required.
Source: https://www.lacma.org/tickets

Free for all visitors on the second Tuesday of each month — Los Angeles County Museum of Art (LACMA)General admission is free for all visitors on the second Tuesday of every month (official LACMA tickets page). Timed-entry reservation still required.
Source: https://www.lacma.org/tickets

LA County residents free after 3pm on weekdays; county youth/teens always free — Los Angeles County Museum of Art (LACMA)Per the official tickets page: LA County residents are free after 3pm Monday–Friday; LA County youth 3–12 and teens 13–17 are free every day, as are NexGenLA members (free membership for LA County kids 17 and under) plus one guest. Note: the ticket office accepts EBT as a payment method — that is not an EBT discount and is not badged as one.
Source: https://www.lacma.org/tickets

Free admission for everyone on Thursdays — Skirball Cultural Center (Noah's Ark)General admission is free to all visitors on Thursdays (official visit overview). Noah's Ark timed tickets are still required/recommended for the play experience.
Source: https://www.skirball.org/

Free admission on the first Wednesday of every month — Autry Museum of the American WestThe museum's official visit page offers free access on the first Wednesday of every month to all exhibitions (full day, 10am–4pm), by reserving a spot in advance via the official site.
Source: https://theautry.org/visit