Washington's free museums are the best deal in American family travel, and the two things that go wrong are both avoidable. The first is the word “free”: two of the most kid-magnetic sites on the list — the National Air and Space Museum and the National Zoo — are free but still require you to hold a pass, and the Zoo's requirement covers every guest including infants. Turning up without one is how a morning gets rewritten. The second is the food rule. Most Smithsonian museums prohibit outside food entirely, there is essentially no coat check or bag storage anywhere, and you will carry everything you brought all day. Get those two right and the rest is easy: this guide covers the passes, the security and bag rules, the hours that aren't what you'd guess, when to arrive to miss the 2pm crush, and where the changing tables and nursing rooms actually are.
- Smithsonian museums: Free, no admission ticket. Most open daily 10am–5:30pm, closed December 25
- Air & Space (Mall): Free, but timed-entry passes are required for all visitors — up to 9 per person, and no re-entry on one pass
- National Zoo: Free, but entry passes are required for all guests including infants. Grounds 8am–6pm, last entry 5pm
- U.S. Botanic Garden: Free with no tickets at all. Conservatory 10am–5pm daily; outdoor gardens 7:30am–7pm
- Security: Airport-style screening at every entrance (shoes and belts stay on). No scissors, pocket knives, pepper spray or selfie sticks
Free still means a ticket at two of them
The National Air and Space Museum on the Mall requires free timed-entry passes for all visitors regardless of age. One person can reserve up to nine passes, groups of ten or more need Group Passes, and you may enter any time that day starting at your pass time with no cap on how long you stay — but once you leave you cannot get back in without a separate pass, which is the detail that catches families who step out for lunch. There is a near-term wrinkle too: on August 21, 22 and 23, 2026, during the Freedom 250 Grand Prix, visitors inside the “Stripes” general access area must get same-day passes from a QR code on signs near the museum, released day-of only rather than in advance. The National Zoo works the same way with a different emphasis: admission is free for everyone, but the Zoo's own visit page states that entry passes are required for all guests, including infants. The grounds run 8am to 6pm with last entry at 5pm, and the animal buildings 9am to 5:30pm. Parking is paid, and the Zoo does not publish the rate on its visit page. Everything else on the free list — Natural History, American History, the National Museum of African American History and Culture, the Portrait Gallery, the American Art Museum, the Renwick, the U.S. Botanic Garden — is genuinely walk-in as of mid-August. The Botanic Garden is the strongest of them on this point: “admission is free and no tickets are required,” full stop, including for its evening programming.
Security, bags, and the food rule nobody expects
Every Smithsonian entrance runs a full security screening — described by the institution as similar to an airport except that shoes and belts stay on. Everyone walks through a metal detector, anyone who can't is hand-screened with a wand, and bags are checked by hand or X-ray. The prohibited list has three items that regularly live in a diaper bag or a keychain: pocket knives including Swiss Army knives, screwdrivers and scissors. Pepper spray and Mace are banned, firearms are banned including for permit holders, and tripods, monopods and selfie sticks are barred from museums and gardens. Bag size limits are set per museum rather than institution-wide — the National Museum of Asian Art bars anything bigger than 17 by 26 inches, and the American Art Museum bans suitcases and large backpacks from its galleries. Now the food. Natural History prohibits outside food entirely, and says bagged lunches must be stowed at all times and eaten outside the building. American History permits food and drink only in its two cafeterias, with brown-bag lunches eaten on its terrace or on the Mall. NMAAHC allows no outside food or drink. The exceptions are the American Art Museum, where you may eat your own food in the Kogod Courtyard, and the National Zoo, which explicitly welcomes your own food and snacks. Coat check barely exists anywhere: Natural History has none, the American Art Museum and Renwick have none, the Portrait Gallery has none, American History has a small first-come locker bank, and the Asian Art Museum has lockers at its Freer entrance. Assume you carry everything, and use the Mall as the dining room — picnicking there needs no permit for a family, though alcohol is prohibited.
Timing: be at the door at 10
The Smithsonian's own visitor guidance is blunt about this. Crowds start building around noon and peak between 2 and 4pm; museums are generally more crowded in the afternoon; and the recommendation is to arrive when the doors open at 10am. The quieter months are January, February, September, October and December — worth knowing if your trip is flexible, and worth avoiding the cherry-blossom weeks in late March and early April, when a Smithsonian visitor study attributes the spring surge to the festival. Most museums run 10am to 5:30pm and close December 25. Two useful exceptions: the Smithsonian American Art Museum opens at 11:30am and stays open until 7pm, which makes it the one to hold for a late afternoon, and the Renwick keeps standard 10-to-5:30 hours. A shape that works with young children is one big museum before noon, a packed lunch on the Mall around 12 to 1, and 2 to 4pm spent outdoors at the monuments rather than fighting the peak indoors. On facilities: restrooms at all Smithsonian museums and the Zoo accommodate families with baby changing tables and care spaces. At American History, the family restrooms with changing tables are on 1st Floor East across from the John Bull Locomotive and on 2nd Floor East outside American Stories, with a lactation room in the second-floor Welcome Center. Natural History has a public nursing room in the Constitution Avenue lobby. NMAAHC has a lactation space on Level 3 next to the women's restroom with a table, chair, changing table, sink and outlets, and changing tables in all its restrooms. Several museums have a Family/Companion Care restroom — ask at the information desk.
The free one families skip, and two paid ones worth knowing
The U.S. Botanic Garden at 100 Maryland Avenue SW, about three blocks from Federal Center SW, is the most under-used free stop in Washington with young children: free, no tickets required, a Conservatory open 10am to 5pm daily, gated outdoor gardens open 7:30am to 7pm, the Bartholdi Fountain dawn to dusk, and a Children's Garden with hands-on watering activities. It closes December 25 and is the best warm indoor room in the city on a bad-weather day — and it sits a three-minute walk from the U.S. Capitol Christmas Tree in December. Two paid museums are worth budgeting for, mostly because their closed days catch people out. The National Children's Museum at 1300 Pennsylvania Avenue NW, steps from Federal Triangle and three blocks from Metro Center, charges $18.95 for adults and for children age one and up, with under-ones free; it opens 9:30am to 4:30pm and is closed Tuesdays. The National Building Museum at 401 F Street NW, across the street from Judiciary Square, charges $18.95 for adults and $15.95 for youth and seniors — but its enormous Great Hall and the museum shop are free to walk into, which is a genuinely good ten minutes on a rainy day at no cost. It is open Thursday through Monday only: closed both Tuesday and Wednesday, a five-day week that is very easy to get wrong.
Museum events in our catalog
Live from our catalog — 17 upcoming, refreshed weekly.
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FAQ
Are all the Smithsonian museums free?
Yes — admission to the Smithsonian museums and the National Zoo is free. But free is not the same as walk-in: the National Air and Space Museum requires free timed-entry passes for every visitor, and the National Zoo requires free entry passes for all guests including infants. The rest of the Mall museums are walk-in as of mid-August 2026.
Do you need tickets for the National Air and Space Museum?
Yes, free timed passes for all visitors regardless of age. One person can reserve up to nine; groups of ten or more use Group Passes. You can enter any time that day from your pass time and stay as long as you like, but you cannot re-enter after leaving without a separate pass — so do lunch before you go in, not halfway through.
Can you bring food into the Smithsonian museums?
Mostly no. Natural History prohibits outside food and requires bagged lunches to be stowed and eaten outside. American History allows eating only in its two cafeterias, with brown bags on the terrace or the Mall. NMAAHC allows none. The exceptions are the American Art Museum's Kogod Courtyard and the National Zoo, which welcomes your own food and snacks.
What time should we arrive with kids?
Be at the doors at 10am when they open. The Smithsonian's own guidance is that crowds build from around noon and peak between 2 and 4pm. Do your one big museum in the morning, eat outside on the Mall, and spend the afternoon at the monuments. January, February, September, October and December are the quieter months overall.
Which DC museums are closed midweek?
The National Building Museum is open Thursday through Monday only — closed both Tuesday and Wednesday. The National Children's Museum is closed Tuesdays. Both are common rainy-day recommendations, and both will burn a family that shows up midweek. The Smithsonian museums open daily and close only on December 25.