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Routes
Running trails & routes
United States
Maryland
Baltimore County
Catonsville

Gray's Mill Trail

Moderate

2.8

(12)

94

runners

Gray's Mill Trail

01:19

10.7km

110m

Running

Jog the moderate 6.6-mile Gray's Mill Trail in Patapsco Valley State Park, featuring forest views, natural surfaces, and the historic Gray's

Last updated: February 26, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Patapsco Valley State Park

Waypoints

A

Start point

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1

10 m

Gray's Mill Trailhead

Highlight • Trail

This area of Patapsco Park is less frequently trafficked, but just as pleasant as the southern trail system. A true hidden gem! There are a few small stream crossings and plenty of interconnected trails to explore.

Tip by

2

5.33 km

Gray's Mill

Highlight • Historical Site

The Gray's Mill Trail starts near the old mill house, which has an informative signpost outside describing the history of the mill. There are a number of other historic repurposed mill houses up the road in Ellicott City.

Tip by

B

10.7 km

End point

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Way Types & Surfaces

Way Types

10.7 km

Surfaces

10.7 km

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Elevation

Elevation

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Saturday 9 May

21°C

12°C

-- %

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This route was planned by komoot.

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Frequently Asked Questions

Where can I park to access the Gray's Mill Trail?

The trail is located within Patapsco Valley State Park near Ellicott City. While specific parking details aren't provided, the trail is known to connect the Ellicott City and Catonsville areas. Look for designated parking areas within the park that provide access to the Gray's Mill Trailhead.

Is the Gray's Mill Trail dog-friendly?

Yes, dogs are permitted on the Gray's Mill Trail. Always ensure your dog is leashed and follow all Patapsco Valley State Park regulations regarding pets.

What's the best time of year to jog the Gray's Mill Trail?

The trail offers a picturesque setting winding through a forest, making it enjoyable in various seasons. Spring and fall are generally ideal for jogging due to milder temperatures and vibrant foliage. Wildflowers can be observed in spring, and the forest colors are beautiful in autumn. Be mindful that natural surfaces may be wet and covered with debris, especially after rain or in winter.

Are there any fees or permits required to use the trail or enter Patapsco Valley State Park?

As the Gray's Mill Trail is located within Patapsco Valley State Park, standard park entrance fees may apply. It's always a good idea to check the official Patapsco Valley State Park website for current fee schedules and any permit requirements before your visit.

What is the terrain like on the Gray's Mill Trail for jogging?

The trail is primarily a singletrack with natural surfaces, meaning it's a narrow path. You can expect rolling hills with 'punchy climbs' and descents, indicating a good workout with some challenging inclines and uneven ground. The surfaces can occasionally be wet and covered with debris.

How long does it typically take to jog the Gray's Mill Trail?

The full route is approximately 10.6 kilometers (about 6.6 miles) and typically takes around 1 hour and 19 minutes to jog. Keep in mind that individual times may vary based on fitness level and trail conditions.

What can I see along the Gray's Mill Trail?

The trail winds through a forest, offering scenic views of the river valley. You can observe wildflowers and various wildlife. A notable historical point of interest along the route is the historic Gray's Mill, located near its upstream terminus.

Is the Gray's Mill Trail a loop?

The Komoot route for Gray's Mill Trail is an out-and-back route, meaning you will return along the same path you took to reach the turnaround point.

Does the Gray's Mill Trail connect to other paths?

Yes, the route also passes through sections of the Patapsco Traverse (north hiking), Patapsco Traverse (north mtb), Patapsco Alt HoCo Thru Trail, Patapsco Howard County Thru Trail, Patapsco Traverse (south hiking), Patapsco Traverse (south mtb), Farm Connector Trail, HillTop Connector, Buzzards Rock Trail, and Sawmill Branch Trail.

Are there amenities like restrooms or cafes near the trail?

The Gray's Mill Trail is equipped with amenities such as a kiosk and a bike fix-it station. For restrooms or cafes, you would likely need to visit facilities within Patapsco Valley State Park or in nearby Ellicott City.

Is the Gray's Mill Trail suitable for beginner joggers?

While some segments are considered easier for hiking, the trail's singletrack nature and 'punchy climbs' make it moderately difficult for jogging. It's more demanding than a flat, paved surface, so beginners should be prepared for uneven ground and elevation changes.

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