Smith and two trappers left the remaining party on the Stanislaus River in the spring of 1827 and traversed the Sierra Nevada over Ebbetts Pass, then crossed Nevada, roughly following the route of present U.S. Highway 6. They reached the Utah-Nevada border near present *Grandy, Utah, then continued on to Skull Valley. Two days later, they reached the south tip of the Great Salt Lake and arrived at the 1827 rendezvous on Sweet Lake (Bear Lake) at present-day Laketown, Utah.
At the close of the rendezvous, Smith, with eighteen men, again headed south through Utah. They traveled south to the Weber River, and then to the Great Salt Lake; he then followed his previous trail, excluding his jaunt into the Sanpete Valley. The party continued to the Mojave villages; however, while crossing the Colorado, Indians attacked the party, killing half of Smith's men and capturing all the horses. The remainder made their way to California, only to find that Mexican officials there wanted to incarcerate them. It was finally resolved that Smith's company was to leave California by way of Bodega. The company spent the winter of 1827-28 in the San Francisco Bay area; in the spring of 1828 they pushed north, finally reaching Smith's Fork of the Umpqua River. Here the encampment was attacked by Kelawatset Indians; only four survived the attack, including Smith. The four reached Fort Vancouver in mid-August 1828, and received help from the British trappers there.