Magnetic fields in the early solar system likely helped form planets by pulling together gas and dust. One way to obtain measurements of these magnetic fields is by conducting paleomagnetic records with meteorites, and more recently, with samples returned from asteroids. In this study, we analyzed rock samples from the asteroid Bennu, returned by NASA’s OSIRIS-REx mission, to see if they recorded a magnetic field from the solar nebula. We measured six samples using paleomagnetic and rock magnetic measurements. Our results suggest Bennu formed in a region of the solar system with a magnetic field around 10 microteslas, about 3.5 million years after the first solid materials appeared. This supports the idea that Bennu formed far from the Sun, likely beyond 6 astronomical units (AU).