4 Square Farm is a family-owned operation in Rio, Wisconsin, established in 2020. Trainer Mark Nesson brings over 40 years of experience from working on his father's training farm, while the family brings additional years of handling multiple breeds and managing facilities. The farm offers lessons, training, and boarding for riders of all skill levels.

Stall board includes daily turnout in four wooded paddocks, bedding, grain, blanketing, and administration of owner-provided supplements. The farm sits on 20 acres and features a 60x120 indoor arena, an outdoor arena, and a trail loop around the hay field, plus a heated tack room and hot/cold wash rack.

• With a single 5-star rating and no review text, this facility appears well-regarded.