Union Mill and Bull Run Occoquan Trail Loop

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Hemlock Overlook Regional Park

Union Mill and Bull Run Occoquan Trail Loop is a 3.6 mile heavily trafficked loop trail located near Manassas, Virginia that features beautiful wild flowers and is good for all skill levels. The trail offers a number of activity options and is accessible year-round. Dogs are also able to use this trail but must be kept on leash.

Length3.6 miElevation gain308 ftRoute typeLoop
Dogs on leashKid friendlyHikingNature tripsWalkingBird watchingRunningForestViewsWildflowersWildlifeMuddyRocky
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Reviews (580)
Photos (641)
Activities (586)
Completed (1,077)
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Ioana Munteanu
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Hiking
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Connie McKeon
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Hiking

I only rated this a 3 because I’m not sure if I was actually on this trail...never saw a sign for it! I ended up on the Bull Run Occoquan Trail which was a bit more challenging with a puppy than I expected. Nice park though...

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Russ Wallace
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Hiking

We took a quick short hike down and back to the river. Nice and dry mostly. Good little mile hike!

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K Keys
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HikingGreat!

Limited parking; beautiful trail

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Jessica Beckstrand
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Hiking
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Sierra Kennedy
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Hiking

One of my go-to local trails. Easy enough to moderate and bring my kids, but also great for a quick morning hike. Always recommend for individuals, families, and pups!

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Zachary Ollinger
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Hiking
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Amanda Muller
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Hiking

Nice little hike! I tracked 3.25 miles, not 3.6.

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Shawn Faunce
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Hiking

Nice, not many people.

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Todd L.
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Hiking

Perfect day

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Tyler Williams
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Hiking
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Angela Zacatales
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Hiking

Great trail! Not muddy at all

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Todd L.
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Hiking

Trail was awesome almost no mud.

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K Schell
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Hiking

Great trail with a couple distance options but very muddy in parts. Definitely don't just wear your gym shoes. There are lots of parts with slate rocks so be careful if you have knee or ankle issues. Some beautiful views if you get down to the water. there is a parallel trail at one part that puts you closer to the water, but I missed it. Something to try next time.

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Humaira Siddiqi
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Hiking

Easy trail, good for small children. Follow along the Johnny Moore run , nice spots to take in the view, shaded and cool

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Rob Thompson
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HikingMuddy
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Jason Fincher
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Hiking

Still a little muddy. Needs to dry out a bit.

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Min Cho
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Hiking
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N G
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Hiking

Fresh snow and only saw 8 people in 5 miles on what was noted to be a busy trail.

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Katie Sayer
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Hiking
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Richard Reithinger
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WalkingGreat!

Great trail. Path down to the creek was somewhat crowded, but once at the creek we were virtually alone. Great for just walking, walking dogs, and breathe in the fresh air. The icing on the cake with this trail is the post-walk winery visit.

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Todd Graham
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Hiking

Beautiful!

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Sarah Jane
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Hiking

Very muddy if you go off the trail

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Sarah Masoom
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Hiking

beautiful views. water is gorgeous. great loop. it's more like 3.1 miles. also I'd rate it as moderate, not easy. (I think of easy being flat surfaces and this had plenty of climbs and some rocky terrain)

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John Newcomb
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Hiking
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Greg Peters
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Hiking

If it has been wet make sure you wear good shoes or boots

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Marcum Thompson
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HikingGreat!

An excellent woodland trail, with some extended stretches along Bull Run. Some pretty steep going at the beginning and end of the trail, but pretty easy going as you walk along Bull Run. Parking can be a challenge on the weekends due to the nearby Winery, but the trail itself wasn't crowded.

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Andrew Sharrock
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Hiking
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Anson Tsui
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Hiking
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Jonathan Shaw
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Hiking

still a good hike in the winter.

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