Wonderful scenic trail. Agree that mountain bikes are best but we had hybrid tires and got along fine. Great experience and glad to add it to our list. A few steep climbs, but most of it is a moderate ride. I do think the trail could be marked better as there are lots of spurs. We had the trail map that kept is on the main route.

Mammoth Cave R.R. Trail:
This trail is 80 percent under a tall tree canopy. Nice and shaded. There was a light rain most of the day. A constant misting. The canopy kept us pretty dry. That same canopy will be very welcome during the hot summer months. The gravel trail width varies from 5’ to 10’. Most areas it is 6’ to 8’ wide. Branches encroach the width every so often and necessitate single file riding. The gravel was very small, similar to d.g.a. (dense gravel aggregate), nicely compacted. Not many washouts and not many sections of loose gravel. The rather small blue background distance markers need new white paint. Branches should also be cut back to improve visibility of these signs. We cycled this trail in mid May and the maintenance crews had probably not cut anything back yet. There are not many mileage markers going the other direction, toward the visitor center. Need to also spray some weed killer at the Southern end. I rated this trail a four because there are no r.r. trestles / bridges nor great vistas. The beautiful hardwood canopy is very pleasant. The trail has minor grades except for at least one of the three marked hills. Most will simply walk their bike the top portion of that grade. It is a great one day ride. There are no available shuttles. If you can’t physically ride the full 20 miles, you can park in one of a couple small parking lots between the two ends of the trail. Head in either direction and bike back to get a few miles in. If you still have the energy and are so inclined, head the other direction and back to complete the entire 20 miles (9-10 miles each way). Some in you party may pass on the entire and bug out after doing the half route.

Big Hollow Trail:
Never got to this one. You must take a ferry across the Green River. This is a steel cable, tethered, single auto at a tim, ferry. The lines were only four cars deep each side, but it would have probably taken 30-40 minutes each direction. We were short on time and took a pass. We contemplated biking across on the next ferry but were informed of the 3 mile long, steep grade, just West of the river, to get to the trail head. One in our party, who had been nursing a cramp, quickly nixed that idea.

KyKevin

Rode most of the trail yesterday. It's still a bit stark since the leaves haven't popped yet. Nice trail but much of it is parallel to the main road and not much into the wilderness.

Great trail, will go back soon

Starting at the south end near Park City, the trial is a long, fairly steep climb for most of the first 2-3 miles. From that point on north, the trail is level or gentle grades and only got off and walked once. The trail surface is a fine crushed stoned, 4-5 feet wide, and full of curves. Since most of the trail is in the trees, there is an abundance of sticks and leaves covering the crushed stone. Mountain bike tires work great but hybrid should be ok. This trial has great views and provides a good workout. The return ride is thrilling at the south end when you decend that steep 2-3 mile section at break-neck speed and work your way through the curves on the semi-loose stone.

We started this trail at Mammoth Cave. The trail is a gravel bed and hilly. There are two areas on this trail where the posted map indicates you should walk the bike. I suggest trying this trail with multi-surfaced tires.

Trail is a good work out for any age group, might be a little bit of a challenge, for the little ones.. we rode 17 mi in about 2.75 hrs.. had a blast, this is our first time to ride a trail of this type, and were very impressed. Will be coming back in the fall when the leaves change.. The camp ground looked very hospitable and is right on the trail. Cabins and park resort are within sight of the trail. Done one of the cave tours last year, it is a incredible thing to see.. Park rangers and staff have that always enjoyable southern hospitality.

We took our Tandem Two's Day on the trail a few days ago to break up the annual Thanksgiving road trip and found that the surface worked for us. We have wide tires, but they are smooth - not mountain bike tires. We aren't particularly experienced with the tandem (only around 400 miles so far), and I had to use great care (and a lot of braking) going down the hills. There were also a few places we had to walk the bike up as well. Still, it was a fun and challenging way to get into the park. This time of year the trail (fine, packed gravel except for a couple of spots) is half leaf-covered, adding to the excitement. Definitely not appropriate for inexperienced bikers, anything with narrow tires, or small children. For others, it is a great workout!

Nice trail for the family,though some parts may be a little steep for kids. They've pulled up the loose gravel and laid down some that is much better. Mountain bike tires are still a must, anything less will slow you down or force you to work hard on your drifting skills. Very scenic, just an all around beautiful ride. Take your time and enjoy the view. Well done Park City, Mammoth cave NP, and all involved.