Free days and hours are subject to change. As always, be sure to check with the site to ensure that listed days and times are current.
The Children's Museum of Houston - Thursday evenings from 5-8pm. www.cmhouston.org.
The Museum of Health and Medical Science. Thursday afternoons, 2-5pm. Extra fee required for special exhibitions. www.mhms.org.
The Houston Zoo. First Tuesday of the month, September - May, 12pm - closing. Free, but ticket required. www.houstonzoo.org.
The Houston Museum of Natural Science. Thursdays after 2pm. www.hmns.org
The Museum of Fine Arts. Every Thursday, all day. www.mfah.org
Free family days at Bayou Bend are the third Sunday of each month, September - May. www.mfah.org/bayoubend
Lunar and Planetary Institute Family Space Days, 10am-1pm on the thrid Saturday of each month. www.lpi.usra.edu/education/space_days
African American Library at the Gregory School (includes museum). Always free.