Writer Mark L. Smith's second Western screenplay after The Revenant (2015).
According to Betty Gilpin, the cast had to undergo a month of cowboy camp in preparation for the grueling shoot.
Director Peter Berg's desire to work in the tradition of the 1972 western film "Jeremiah Johnson" and put himself and his cast and crew through the hardship of a difficult location shoot meant 137 days out in the elements and only three in a studio. According to Berg, by the time they got to the studio, the company hated it. He said "We were so feral from having been out there", and noted that the cast and crew's reaction to the soundstage was, "We don't belong here. We're not fancy enough."
In 2023, the production had completed about 7 months of the shoot when the Hollywood writers' and actors' strike put a hold on everything for 5-6 months.