Info courtesy of www.fdlco.wi.gov 

The Eisenbahn Trail is open to ATV use between December 15th and March
15th when the ground is frozen and the temperature is 28° or lower. 
ATV riding is allowed on the Eisenbahn Trail only.

For specific information regarding the Eisenbahn State Park Trail,
please contact the County Planning and Parks Department at
920-929-3135.