1852
A Beloit butcher formed one of a party that went to California in 1852, staying three months.
Nation and worldGrade A · 1 independent source
The evidence
“In 1836, he moved to Jones Co., Iowa, and took up a claim on his own account ; from Jones Co., he moved to Beloit, where he went to farming and raising stock ; there, in 1846, went into the butchering business. In 1852, he formed one of a party that went to California, and who traveled together for mutual protection ; he stayed there but three months, then returned to Beloit. In 1854, he engaged in the produce business, buying hogs, cattle, grain, etc., and shipping to market.”
1879-history-of-rock-county/18-bios-beloit.md, PDF p. 731
Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.
Grade A: Found on a page of one of our sources