OPSF5050

The OPSF5050, held on March 21, 2026, in the heart of Poland, Indiana's Owen-Putnam State Forest, beckons trail runners seeking a true challenge. Offering distances of 50 miles, 50 kilometers, 14 miles, and 10 kilometers, this long-standing Indiana tradition, dating back to 1993, is renowned as "Indiana's toughest trail race". The course, starting and finishing at the Horse Campground, traverses a rugged landscape of 90% single-track and horse trails, interspersed with occasional fire roads, presenting a relentless series of rolling hills and challenging ascents. Runners in the 50-mile race will contend with over 6,500 feet of elevation gain.

A defining feature of the OPSF5050 is its infamous mud, a constant presence due to year-round natural springs and heavy horse traffic, often leaving trails rutted and sections deep enough to engulf a shoe. This necessitates continuous focus and adaptability, making it difficult to find a consistent rhythm. Typical race day conditions in late March include highs around 56F and lows around 34F, with an 18% chance of precipitation, though spring weather in Indiana can be unpredictable, ranging from dry to sleet and snow. Aid stations are strategically placed throughout the "lollipop" shaped course, but runners should note that this is a cupless race, requiring them to carry at least 20 ounces of hydration capacity.

Organized by the non-profit Indiana Trail Running Association, the OPSF5050 maintains a low-key, community-focused atmosphere while pushing participants to their limits. Despite the "brutal" and demanding nature of the course, runners frequently praise the excellent course marking, making it nearly impossible to get lost, and the supportive volunteers who contribute to a memorable, albeit grueling, experience. Whether tackling an ultra-distance or a shorter trail run, the OPSF5050 promises an unforgettable adventure through the beautiful, yet unforgiving, Owen-Putnam State Forest.