Spring 1837
The narrator's father returned from Pennsylvania to make improvements on his claims near Beloit.
BeloitGrade A · 1 independent source
The evidence
“Of him my father purchased a couple of "claims," one very near the village of Beloit, the other a few miles out. Passing the ensuing winter in Pennsylvania, he returned to make some improvements on his claims in the spring of 1837, accompanie] by my brother and brother-in-law, C. W.”
1856-history-of-rock-county/04-correspondence-pioneer-letters.md, PDF p. 50 / book p. 32
Guernsey, Orrin, and Josiah F. Willard, editors. History of Rock County, and Transactions of the Rock County Agricultural Society and Mechanics' Institute. Janesville, Wis.: William M. Doty & Brother, 1856. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871593.
Grade A: Found on a page of one of our sources