Manhattan Project National Historical Park
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Manhattan Project at a glance
- Best time
- March–May, October–November
- Trip length
- 2–3 days
- Don't miss
- Los Alamos: Hike Acid Canyon Trail
- Nearby city
- Denver, CO
Explore this park
About Manhattan Project National Historical Park
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.
No current NPS alerts
The National Park Service has no active alerts listed for Manhattan Project National Historical Park. Conditions change quickly — check again before you go.
Source: National Park Service (as of Nov 1, 2026). Official Manhattan Project National Historical Park page on nps.gov
Weather Information
The Manhattan Project National Historical Park has units in Hanford, WA, Los Alamos, NM, and Oak Ridge, TN.
Operating Hours
Hanford Visitor Center
The Hanford Visitor Center is open Monday - Friday 9:00 AM-4:00 PM. Access to the Hanford B Reactor is suspended due to major construction projects. To check for updates about these tours, visit http://manhattanprojectbreactor.hanford.gov/. Separate tours of the Historic Sites are offered beginning in May. For more information about these tours, visit http://tours.hanford.gov/HistoricTours/.
- Monday9:00AM - 4:00PM
- Tuesday9:00AM - 4:00PM
- Wednesday9:00AM - 4:00PM
- Thursday9:00AM - 4:00PM
- Friday9:00AM - 4:00PM
- SaturdayClosed
- SundayClosed
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.
- Monday10:00AM - 3:00PM
- TuesdayClosed
- WednesdayClosed
- ThursdayClosed
- Friday10:00AM - 3:00PM
- Saturday10:00AM - 3:00PM
- Sunday10:00AM - 3:00PM
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.
- MondayClosed
- Tuesday10:00AM - 4:00PM
- Wednesday10:00AM - 4:00PM
- Thursday10:00AM - 4:00PM
- Friday10:00AM - 4:00PM
- Saturday10:00AM - 4:00PM
- Sunday1:00PM - 4:00PM
Common questions
Planning Manhattan Project National Historical Park
The summary above covers timing and highlights. These go deeper on reservations, crowds, and logistics.
Reservation rules vary by season and activity for Manhattan Project. See Overview on this page for fees, timed entry, and campground details before you travel.
