The Old Field Trail at Raccoon Creek State Park's Wildflower Reserve is an easy 0.8 mile one-way trail that runs along the northern section of the wildflower reserve and runs directly next to Raccoon Creek.
The trailhead can be found along the eastern portion of the Henrici Trail and at the eastern end of the Audubon Trail. Or you can pickup the western trailhead along the western portion of the Henrici Trail.
The trail can be muddy, especially during the Spring, but it's well worth the wildflowers. Some small portions of the trail can be a bit of a pain to get through as well with a couple of overgrown sections of thorns and brush, but the trails are generally very well maintained otherwise.
Wildflowers can be found along the trail generally after mid-April.
No dogs, biking, or even food along the wildflower reserve trails.