NK50k

The NK50k returns to Greenbush, Wisconsin on April 3rd for its annual run along the Northern Kettle Moraine Ice Age Trail, a point-to-point tour that has become synonymous with welcoming spring in this part of Wisconsin. Participants start at the Ridge Road Trailhead southwest of Sunburst Ski Hill and finish back in Greenbush Group Camp where post-race refreshments await. The event is known for its challenging terrain, which includes both smooth ski trails and rocky paths through dense forest.
On race morning, runners will face a mix of trail conditions that are firm but may still be slightly soft from early spring weather patterns. Temperatures at 7:00 AM when the run begins could range between chilly and mild, with typical April humidity and potential for light precipitation as snow or rain depending on recent weather changes in Wisconsin’s northern kettle area.
The NK50k is a well-established tradition among trail runners who appreciate its unique route through historic ice age landscapes. With 13 years of history, the event attracts around 200 participants annually who come to earn their coveted finisher sticker and support local running culture. The race serves as an early season test for endurance athletes looking to gauge readiness for longer events later in the year.
The NK50k offers a challenging 50K route alongside a more accessible 25K option, both starting at different times throughout the morning but converging back into Greenbush Group Camp. Runners can register through [https://ultrasignup.com/register.aspx?did=138934](https://ultrasignup.com/register.aspx?did=138934) where they will find details on fees and deadlines for securing a spot in this popular race. Bib pick-up is available from 5:30 to 5:55 AM at the Greenbush Group Camp, requiring participants to bring photo ID.
Participants must start by noon at the latest due to transportation schedules back from Ridge Road Trailhead after the event begins. The finish line address is located in Greenbush Group Camp where runners will find post-race refreshments and support for both 50K and 25K categories. Age requirements vary but generally accommodate those over 18 years old, with younger participants needing parental approval to run.