The Smithsonian's National Zoo is free, sits up Connecticut Avenue in the middle of the city, and is the one Smithsonian site where you're welcome to bring your own picnic — which together make it the best-value family day in Washington. It also has the single most-missed requirement in the city: admission is free, but entry passes are required for all guests, including infants. Families who don't know that turn up at the gate and find out the hard way. This guide covers the pass, the hours that aren't a single number (the grounds, the last entry and the animal buildings all close at different times), what to do about the paid parking, and the 2026 ZooLights season, which already has confirmed dates — November 20, 2026 through January 3, 2027.
The Zoo's own visit page puts it plainly: admission is free for everyone, but entry passes are required for all guests, including infants. That last clause is the one that catches people. A family of five needs five passes, not two, and a sleeping newborn in a carrier counts. Passes are reserved on nationalzoo.si.edu and cost nothing; the requirement is about managing capacity, not revenue. It is worth understanding how this fits the wider Smithsonian picture, because the rules genuinely differ site to site. Most of the Mall museums — Natural History, American History, the Portrait Gallery, the American Art Museum, the Renwick — are straight walk-ins with no ticket of any kind. The National Air and Space Museum requires free timed-entry passes for every visitor, with one person able to reserve up to nine and no re-entry once you leave on a single pass. And the U.S. Botanic Garden, at the other end of the spectrum, requires nothing at all: free admission, no tickets, even for its evening programming. So if you are planning a multi-stop day, the pass question has three different answers depending on where you're going, and the Zoo's is the strictest of the three. Reserve before you leave the house, and screenshot the confirmations rather than relying on signal at the gate.
The Zoo publishes grounds hours of 8am to 6pm, a last entry at 5pm, and animal building hours of 9am to 5:30pm — and treating those as one number is how a late-afternoon visit turns into a walk past closed doors. Arriving at 4:30pm gets you in, but it gives you an hour of outdoor exhibits and roughly an hour of indoor ones. The other end of the day is the good end: an 8am arrival means thin crowds and the animals at their most active, and it lines up with the Smithsonian's general guidance for the whole institution, which is that visitor numbers build from around noon and peak between 2 and 4pm. The Smithsonian also names January, February, September, October and December as its quieter months overall, which is useful if your trip dates are flexible — a September weekday morning at the Zoo is a genuinely different experience from an April Saturday afternoon during the cherry blossom festival. Security is the same across the institution: airport-style screening at the entrance, everyone through a metal detector with shoes and belts on, bags checked by hand or X-ray. Empty the diaper bag of anything on the prohibited list first — pocket knives, screwdrivers and scissors are all barred, as are pepper spray, firearms (including for permit holders), and tripods, monopods and selfie sticks.
The Zoo's food rule is the exception that makes it the best-value Smithsonian for a family, and it is worth stating explicitly because the rest of the institution goes the other way. Natural History prohibits outside food entirely and requires bagged lunches to be stowed and eaten outside the building. American History permits eating only in its two cafeterias. The National Museum of African American History and Culture allows no outside food or drink at all. The Zoo says the opposite: visitors are welcome to bring their own food and snacks in. Pack lunch, pack the water bottles, and skip the concession queue entirely. Parking is the one real cost of the day. It is paid, and the Zoo does not publish the rate on its visit page, so price it against Metro before you drive: up to two children age four and under ride free with each fare-paying adult, weekday peak rail runs $2.25 to $6.75 by distance, and after 9:30pm and all weekend it drops to $2.25–$2.50. If you take rail with a stroller, remember that only folded strollers are allowed on escalators — an occupied stroller means you must use the elevator, and WMATA publishes a live outage page worth checking before you leave. On facilities, the Smithsonian states that restrooms at all its museums and the Zoo accommodate families with baby changing tables, care spaces and accessible spaces.
ZooLights is the Zoo's winter event and one of the few DC holiday attractions with confirmed 2026 dates already posted: November 20, 2026 through January 3, 2027. The Zoo describes one million LED lights, animal lanterns and live music across the grounds. Hours and pricing had not been posted as of mid-August, which is normal — the details typically drop in the fall. Historically the lights themselves have been free to walk through, with paid parking and a handful of individually ticketed attractions inside, but do not treat that as a promise for 2026; check nationalzoo.si.edu before you go. Two practical notes while you wait for details. First, the Zoo's year-round entry-pass requirement means you should check whether passes are also needed for ZooLights nights when the information posts, rather than assuming an evening event works differently. Second, the bring-your-own-food rule applies here too, and a thermos of cocoa is the single best thing you can carry into a December evening walking the grounds — December evenings there run cold. If ZooLights fills up or the dates don't work, the region's other big light displays are covered in our holiday lights guide, including Meadowlark's stroller-friendly half-mile Winter Walk of Lights and the free Pathway of Peace on the Ellipse.
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You need a free entry pass, and every guest needs one — the Zoo's visit page specifies all guests, including infants. There is no charge. Reserve them on nationalzoo.si.edu before you go rather than at the gate.
Yes. Admission is free for everyone. The only costs of a Zoo day are parking, which is paid at a rate the Zoo does not publish on its visit page, and anything you buy inside — and you can avoid the second by bringing your own food, which the Zoo explicitly permits.
The grounds are open 8am to 6pm with last entry at 5pm, and the animal buildings run 9am to 5:30pm. Those are three different times, so a late-afternoon arrival is largely an outdoor visit. Early morning is both the quietest and the most active time for the animals.
Yes — and it is the only Smithsonian site where you can. The Zoo states that visitors are welcome to bring their own food and snacks in. Natural History, American History and NMAAHC all prohibit outside food, so the Zoo is where the picnic goes.
November 20, 2026 through January 3, 2027. Hours and pricing had not been posted as of mid-August 2026; historically the lights have been free with paid parking and some individually ticketed attractions, but confirm on nationalzoo.si.edu before you plan an evening around it.