Greensfelder - Fossil Ridge

This is a very hilly park, and all of the trails are either going up or down for the entire length, some of it in the shadow of the Six Flags roller coasters! Because of this steep terrain, large parts of these trails, mainly the low-lying areas, are slow to dry. Waiting 2-3 days after a rain is a good rule of thumb, except in very dry or frozen conditions. The upper part of Dogwood going counter clockwise is almost always rideable, but the bottom will typically remain wet for a long period after rain since the whole area drains down through it. Please use your best judgment on deciding whether to ride them when they are wet.

Many changes have taken place since GORC has reworked parts of existing trails, and built several new ones. The Dogwood loop was almost completely rerouted from 2004-06, and the DeClue trail has added considerable mileage, now stretching to 8 miles, and the  Beulah Trail has also been rerouted. The Deer Run Trail is being worked on 2019-2021, and will be approximately 4.4 miles in length when completed including 1.8 miles of new singletrack.

Due to the number of trail features, and its rocky surface, DeClue (8 miles) is considered a fairly technical place to ride. Expect a tough workout, and some sections that may require hike-a-bike (for short runs). If you like choosing your lines, fast narrow descents, and rocks to test your skills, then you'll love this trail. Dogwood (2.6 miles) is fast and flowy, with a banked s-turn, and some rocky spots thrown in to keep you on your toes. Eagle Valley (3.4 miles) is chat-covered doubletrack with the exception of 0.3 miles of singletrack behind the Visitor Center, and a short section near the stables. The Green Rock now shares a large part of its length with the DeClue trail. Its total length has increased to 14.5 miles, of which 8 are in Greensfelder.

All of the trails in the park are open to hikers, bikers, and equestrians. Trail traffic often includes horses, so be careful and courteous when encountering equestrian traffic. Always dismount your bike and go off the downhill side of the trail. For the most part though, this park is not heavily used. Make sure and take the bug spray in the summer.

If you want to "taste" Greensfelder before diving in, ride the Dogwood trail first. Depending on how you choose to ride the loops, you can get in rides from 8 to more than 18 miles just on Dogwood/DeClue/Eagle Valley.


Take Interstate 44 to the Allenton/Six Flags Exit 261. Go north on Allenton Rd,  past the Six Flags entrance. Allenton Rd. bisects Greensfelder Park. Parking is in the gravel parking lot for the Roundhouse Memorial on the left just before Hencken road.


There is a pit toilet at the trailhead, and at the 2 picnic shelters. Water is available at the 2 shelters and the learning center.

Trail Information

Trail Steward(s)


Intermediate / Advanced


16+ miles


Multiple Loops


Trail Conditions

Latest Conditions

From Bartman on Mon, 08/21/2023 - 2:09pm - Greensfelder (St. Louis Area)
DeClue is dry and gtg gorgeous but 5 trees down, that one old growth been down 3/4 weeks and folks have braided around it and it’s way off camber and not gonna last long
From Mr. V on Sun, 08/13/2023 - 9:44am - Greensfelder (St. Louis Area)
Declue is good to go. Several large trees down but that's to be expected.
From Bartman on Sun, 07/30/2023 - 4:51pm - Greensfelder (St. Louis Area)
DeClue - Trails g2g in terms of dry but 7 trees down including one of the old growth 6-8 ft diameter trees
From The Krackheads on Fri, 03/31/2023 - 9:49am - Greensfelder (St. Louis Area)
quick drive by this am and the trail was visibly wet for only a .25" of precip. Trail is probably an ORANGE vs yellow as I would advise against riding.
From The Krackheads on Mon, 03/20/2023 - 8:03am - Greensfelder (St. Louis Area)
too many areas of full thaw, please do not ride.
From Bartman on Sat, 03/18/2023 - 3:00pm - Greensfelder (St. Louis Area)
DeClue was in good shape frozen, Deer Run was getting freeze/thaw in spots where sin was hitting it. Expect it to be sloppy as temps rise on Sunday