From what I know they do both. Full time roles usually go through their own hiring process so checking foremostfarms.com directly is your best starting point. That said for production and seasonal work they do bring in staffing agencies here and there particularly around their Wisconsin locations. I would go direct first and if nothing fits right now touching base with a local agency in that area is not a bad backup plan at all.

Foremost Farms USA hires directly for some roles but also uses staffing agencies for others. You can check their careers page or job postings on Jobcase and other job search providers to find current opportunities. Good luck with your job search!