This event is free and open to the public. No reservations are required.
For more details click on the information links/short videos below or contact the WSMR Public Affairs Office at 575-678-1134.
The year 2020 marks the 75th anniversary of the Trinity Site test. Wait time getting on the installation could exceed more than one hour.
October 2, 2021
The first Saturday in
April and October.
Stallion Gate Hours:
8 a.m. - 2 p.m.
Trinity site prompt closure:
Due to the annual increase in the number of visitors to the Trinity Site Open Houses. The Alamogordo caravan is only open to the first 125 vehicles. The limit is necessary to maintain a safe environment enroute to Trinity Site. All others will have to enter the site through the Stallion Gate located off U.S. Highway 380,
View directions here. The route is approximately the same time and distance as the caravan route.
Members of the press who would like to cover the upcoming Trinity Site open house must register with our Public Affairs Office. Please click the link below to register:
Directions: I-25, Stallion Gate Entrance, and Alamogordo Alternative Route
Q&A: Trinity Site Open House Frequenty Asked Questions
Real ID: Site Entry Identification and Real ID Act Information
Trinity History: Manhattan Project Story, Bomb Designs, Beginnings of Trinity Site, McDonald Ranch House, and more
Radiation:: Trinity Site Radiation Information