Manhattan Project National Historical Park
Hours
See this week's hours below.
- Entrance fee
- The Park Service lists no entrance fee for this site.
- Address
- National Park Service, Manhattan Project National Historical Park, Denver, CO 80225-0287
About Manhattan Project
The Manhattan Project is one of the most transformative events of the 20th century. It ushered in the nuclear age with the development of the world’s first atomic bombs. Most of this development took place in three secret communities located in Hanford, WA, Los Alamos, NM and Oak Ridge, TN. Today, you can visit these three sites that make up Manhattan Project National Historical Park.
Hours
Hanford Visitor Center
Access to the Hanford B Reactor is by tour only. Separate tours of the Historic Sites are also offered. For more information about tours of the B Reactor, visit http://manhattanprojectbreactor.hanford.gov/. For more information about tours of the historic sites, visit http://tours.hanford.gov/HistoricTours/.
| Monday | 7:30 AM to 4:00 PM |
|---|---|
| Tuesday | 7:30 AM to 4:00 PM |
| Wednesday | 7:30 AM to 4:00 PM |
| Thursday | 7:30 AM to 4:00 PM |
| Friday | 7:30 AM to 4:00 PM |
| Saturday | 7:30 AM to 4:00 PM |
| Sunday | Closed |
Los Alamos Visitor Center
While there is currently no public access to the Department of Energy facilities in Los Alamos, walking tours are available in the town of Los Alamos. The Los Alamos Visitor Center is open Friday through Monday, 10 am to 3 pm.
| Monday | 10:00 AM to 3:00 PM |
|---|---|
| Tuesday | Closed |
| Wednesday | Closed |
| Thursday | Closed |
| Friday | 10:00 AM to 3:00 PM |
| Saturday | 10:00 AM to 3:00 PM |
| Sunday | 10:00 AM to 3:00 PM |
Oak Ridge Visitor Center
The Oak Ridge Visitor Center is located within the Children's Museum of Oak Ridge. Here you are able to speak with National Park Service rangers, watch a short film on the Manhattan Project, and get literature on Manhattan Project-related historic sites throughout Oak Ridge. Visitor Center services are limited on Sundays, but brochures, maps, and site films are available.
| Monday | Closed |
|---|---|
| Tuesday | 10:00 AM to 4:00 PM |
| Wednesday | 10:00 AM to 4:00 PM |
| Thursday | 10:00 AM to 4:00 PM |
| Friday | 10:00 AM to 4:00 PM |
| Saturday | 10:00 AM to 4:00 PM |
| Sunday | 1:00 PM to 4:00 PM |
Changes to these hours
- Labor Day, Sep 7: Closed
- Thanksgiving Day, Nov 26: Closed
- Christmas Eve and Day, Dec 24 to Dec 25, 2026: Closed
- New Year's Eve and Day, Dec 31 to Jan 1, 2027: Closed
- Memorial Day, May 31: Closed
- Independence Day, Jul 4: Closed
Getting there
Manhattan Project National Historical Park is located in three states: New Mexico, Tennessee, and Washington. For more information on accessing each of these three units, visit our Directions & Transportation page.
Weather
The Manhattan Project National Historical Park has units in Hanford, WA, Los Alamos, NM, and Oak Ridge, TN. Check local weather conditions at each unit before you visit.
Things to do
Guided Tours, Junior Ranger Program, Museum Exhibits, Park Film.
Source: National Park Service data feed, checked September 24, 2026. Hours shown are the Park Service's posted standard hours plus any date changes it lists. Official page for Manhattan Project ↗