On the 1st day of February Charles wed Caroline, in 1860.
On the 2nd day of February, the Ingalls family hosted the first church services of De Smet in their home, 1880.
On the 7th day of February, Laura was born, 1867.
On the 10th of February, Laura passed away, 1957.
On the 13th of February, Almanzo was born, 1857.
The month of February held several Masonic events for various Ingalls family members through the years (more about that in Little Lodges on the Prairie: Freemasonry in the Ingalls Family).
February was the month in 1889 that Charles was appointed Deputy Sheriff in Kingsbury County (De Smet). (Note: this was not his first gig as Deputy, just the only one for which I have proof in hand of a February appointment.)
What Ingalls-Wilder-Lane-related February happenings can you add?