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Union Mill and Bull Run Occoquan Trail Loop

EASY 133 reviews

Union Mill and Bull Run Occoquan Trail Loop is a 2.8 mile moderately 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.

2.8 miles
255 feet

dogs on leash

kid friendly


nature trips

trail running


bird watching



wild flowers




30 days ago

The stream, rocks and elevation changes were interesting enough to keep 10 year old entertained.

1 month ago

trail running
8 months ago

I usually add a couple more miles of the blue Bull Run trail to this but overall a fun little run. Make sure to study the map beforehand, the trailblazes are tricky the first time you go on it. Gets quite muddy after rain but on sunny days it is nice! This trail mostly follows the creek. There are some rocks and a semi-steep uphill climb at the very end—depending which way you start. Pretty busy on the weekends.

9 months ago

First hike of the summer with 6 tween/teens. Great hike. They didn’t love the uphill climb at the northern most point, but they all made it!!

11 months ago

I wouldn’t say this trail is “easy” because it is quite rocky in some parts.
But it’s a lovely trail and we enjoyed it- myself, my 4yo and my pup.

11 months ago

Nice short hiking trail.
Muddy and buggy(both from water I guess) but has great small mountain-like trail and scenery.

Friday, October 27, 2017

Gorgeous park and hiking trails! Scenic natural beauty is abundant here. After a vigorous hike, I love to visit Paradise Springs Springs Winery which is walking distance from the Yates Ford Road parking lot.

Wednesday, October 11, 2017

My dogs love this trail. Some deer, foxes, squirrels, and water fowl. Depending on the weather it can be muddy or hard. Rocks in part. It is connected to the larger trail system of the Regional Park from Bull Run Park to Fountain Head (19 miles). I would call easy with moderate for some of the hills if wet.

Saturday, September 09, 2017

amazing trail. lots of fun, wildlife, water

Thursday, September 07, 2017

very nice trails not well marked at all very easy to get lost.

Sunday, August 27, 2017

great hike, but the trail isn't well marked and it's very easy to get lost and end up on private property

Saturday, August 19, 2017

Trail not well maintained and very muddy. Not well marked and goes through the middle of a kids camp. Do not think I will go back, many other better options.

Sunday, August 06, 2017

About half the hike is akin Bull Run river...very nice. About 1/3 of the hike is over rocks so just be advised. Went with my dog and he enjoyed it as well!

Tuesday, July 04, 2017

Nice hike for the 4th of July. Good views and access to the water for dogs to cool themselves on a hot day.

Monday, July 03, 2017

Overall pretty good trail. The distance and rocky terrain were a bit much for my 5 year old toward the end. The elevations are uphill the final stretch. Relatively easy for me and my 9 year old.

Friday, June 30, 2017

I got to say it was a nice walking/hiking we did. It has bit of everything, by that I mean if you want to make a hike you can or just walk and explore. But overall I was very please specially my dog, he loved exploring the area and getting into the water. And my husband love it as well since it had rocks were he could climb.

Thursday, June 15, 2017

Easy walk along the river!

Sunday, June 04, 2017

Beyond gorgeous walk, loved seeing the river definitely would recommend this! Got lost the first time around though, you definitely need your map for this one.

Sunday, June 04, 2017

Beautiful trail but not very well marked.

Monday, May 15, 2017

Excellent scenery along this sometimes rocky trail. The river portion can become quite sloppy, especially after a rain. The trails are well marked but you have to look for the markings along the yellow and red trails. Great for dogs, not great for small children.

Sunday, May 14, 2017

It was my very first time hiking, to me it wasn't that easy but it was definitely enjoyable!!

Sunday, April 09, 2017

Caution: as this loop is marked in AllTrails today, it could be broken into a northern and southern loop. The northern loop is great. The southern loop is not actually a loop. If you follow the southern half counter-clockwise the trail will end about 2 miles in. If you continue following the AllTrails marked path from that point you will end on private property (the nearby winery) just before reaching the park's parking lot.

Aside from this problem, the trails are great. A nice bit of exercise for us and our 10 year old boxer who has had two surgeries for torn cruciate ligaments. It challenged him a few times, but he made it through and seemed to have a great time overall.

Sunday, February 19, 2017

Beautiful view, well marked trails.

Saturday, February 18, 2017

Beautiful trail easy for all family members

Sunday, January 01, 2017

This trail is a gem tucked behind the estates of Clifton. If you live in the surrounding suburbs, this easy trail offers a quick, welcome getaway from the hustle and bustle. Beautiful groves of mountain laurel and hemlocks nestle themselves in the slopes leading down to Bull Run. The occasional rock outcropping offer the more adventurous a chance to respectfully go off trail and explore. Our sunny but cold winter walk gave us a chance to view the stream looking clearer than ever and we kept our fingers crossed that a VRE train would pass oblong the neighboring tracks. There was only one moderately steep climb in the trail that tested our lungs. Very doable for hearty preschoolers with maybe a shoulder ride or two along the way.

Sunday, November 06, 2016

We parked right outside the park and took the yellow trail to blue by the water and picked the yellow trail back up. At times the trail is challenging. There are a lot of geological rocks on certain parts of the path and because of fall, there were a ton of leaves, so at times it was slippery. Fitbit showed we had climbed 32 floors. Sometimes the trail was well marked sometimes it wasn't. I only heard that gun range way off in the distance just for a short period time. This was a well traveled trail on Saturday.

Parking can be a problem since there is a busy winery next door.

Saturday, November 05, 2016

Good walk down to the river and back. The doggy loves the small beaches by the river.

Tuesday, October 25, 2016

Just tough enough to keep the kids interested. Beautiful scenery. Keep your eyes open for the blazes.

Monday, September 05, 2016

Great view. Be careful when veering off the marked trails. There is a gun range by the blue trail and could get loud at times. Definitely not easy. Get ready to break a sweat.

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