August 1837
The Crosby family came to Rock County, among the first white settlers of Beloit.
BeloitGrade A · 1 independent source
The evidence
“P. 0. Beloit; born in Brattleboro, Vt., June 22, 1805 ; was son of Watson Crosby ; they removed to New Hampshire at an early day ; then came to Rock Co., in August, 1837 ; was among the first white settlers ; there were only two white families in Beloit at that time; there were no fences and no roads ; worked first year for Dr. White, and, in 1839, came to See. 33, Turtle Township, Range 13, and settled on 160 acres, and now have 200 acres under a high state of cultivation, and a fine brick residence, beautifully shaded.”
1879-history-of-rock-county/23-bios-turtle.md, PDF p. 799 / book p. 803
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