SANTA TERESA, New Mexico — The U.S. southern border wall will be painted black, Homeland Security Secretary Kristi Noem announced Tuesday. The initiative, requested by former President Donald Trump, aims to make the steel barrier too hot to climb under the desert sun.
Why paint it black?
Noem explained that black paint absorbs heat, making the roughly 700-mile steel wall extremely hot in sunlight. “When something is painted black, it gets even warmer, making it even harder for people to climb,” she said during a press briefing in Santa Teresa, New Mexico. The dark coating is also expected to slow rust and extend the lifespan of the structure.
Project scale and funding
The One Big Beautiful Bill Act has allocated $46.5 billion for border wall construction and maintenance, funding an additional 700 miles along the 2,000-mile U.S.-Mexico boundary. Construction is ongoing, with current progress estimated at just under half a mile per day, according to Noem.
Security and enforcement context
The announcement comes amid record-low migrant arrests at the southwest border. Walter Slosar, interim chief patrol agent for the El Paso sector, reported averages of 41 daily arrests, down from 400 a year ago. Stricter enforcement measures, including new “National Defence Areas,” have contributed to the decline.
Trump’s border wall history
Plans to paint sections of the wall black first emerged during Trump’s initial term, along with the addition of spikes and razor wire in some areas. Despite criticism and fewer kilometres completed than initially promised, the wall remains a central feature of Trump’s immigration and enforcement messaging.
Next steps
Noem applied paint to a small section during her visit, but the timeline and total cost of the full project have not been disclosed. The administration continues to coordinate construction with U.S. Northern Command and local authorities.
