We have a number of Free Museum days, including every first Tuesday of the month (excluding July and August), as well as free hours for L.A. residents 3pm - 5pm daily. You can learn more about this at our official page: https://nhm.org/plan-your-visit
I would call museum to find any free days, but I do recall there are some
I believe there are specific free days once a month, but I'm not sure of the exact calendar day. I would recommend calling the museum to verify
The science center it's free but the museum of natural history no
Thanks! Your answer is awaiting moderation.