Last updated: February 15, 2023
Trinity Site is located on White Sands Missile Range and is closed to the public. On the first Saturday in April and the third Saturday in October, the US Army hosts a Trinity Site Open House when the public may visit Trinity Site.
See the location of the Trinity Test, site of the first human-caused first nuclear detonation. In this area the nuclear test device, named the Gadget, was placed atop a 100-foot (30.48 m) tall steel tower that was designated Ground Zero. While equipment and instruments are no longer found here, you can view an obelisk at Ground Zero and see the McDonald House, where the Gadget’s plutonium core was assembled.
A limited number of vehicles are allowed in the Alamogordo caravan. All others will have to enter the site through the Stallion Gate located off U.S. Highway 380. For more information visit the US Army Trinity Site Open House website.
Stallion Gate Hours: 8 am to 2 pm
Trinity site prompt closure: 3:30 pm