30 Trails-30 Minutes Hikes Program at Jefferson Barracks Park

30 Trails-30 Minutes Hikes Program at Jefferson Barracks Park. The St. Louis County Parks Department offers the year-round 30/30 Hikes Program - 30 trails that take approximately 30 minutes to hike - located at many parks around the county. If you walk all 30 trails, you will have walked for 15 hours! See website for more information, list of all participating parks, maps of the trails, and to print off the punch card to keep track of the parks you visit. Trails are open daily from sunrise to sunset.