March 1837
Henry G. Spencer removed to Wisconsin, one of the first settlers of Rock County.
Rock CountyGrade A · 1 independent source
The evidence
“HENRY G. SPENCER (retired), Evansville; born in Springfield, Vt., in 1812 ; he removed to Wisconsin in March, 1837, being one of the first settlers of Rock Co. ; he engaged in the improvement of land, and continued farming until 1844 ; then sold his farm and removed to Evansville, where he built a hotel which bore his name until 1879 ; Mr.”
1879-history-of-rock-county/30-bios-union.md, PDF p. 863
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