Home»All»New Free Day for the Houston Museum of Natural Science All/Houston Museum of Natural Science/Things to do New Free Day for the Houston Museum of Natural Science Jill Jarvis 2012-06-16 Jill Jarvis / June 16, 2012 / 0 0 Most Houston museums open their doors for free once a week. For the full list, check HERE. The Houston Museum of Natural Science is changing their free day to Thursdays from 3:00pm to 6:00pm. Your free general admission ticket gets you in to all the permanent exhibits, including the new Paleontology Hall. Looking for more free fun in Houston? Check HERE.