Salton Sea Freezes
On its front page, The New York Times
announced that the Salton Sea in Southern California had frozen and that local residents were ice skating on it. A few days later, the LA Times
applauded the NY Times
for this "masterpiece of fooling," but noted the implausibility of the report since the Salton Sea, being next to Death Valley, was "the nearest to the infernal regions, in winter or summer, of any spot on the crust of the earth." However, a few publications did reprint the story as genuine news.
This appears to be the only April Fool joke the New York Times