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Hiking trails & Routes
United States
Connecticut
Northeastern Connecticut Planning Region

Old Furnace Trail

Easy

2.6

(5)

49

hikers

Old Furnace Trail

00:57

3.33km

80m

Hiking

Hike the easy 2.1-mile Old Furnace Trail in Old Furnace State Park, featuring diverse landscapes, historical sites, and views of Half Hill P

Last updated: February 26, 2026

Waypoints

A

Start point

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1

1.61 km

Half Hill

Highlight • Summit

B

3.33 km

End point

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Way Types & Surfaces

Way Types

3.33 km

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Elevation

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Highest point (150 m)

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Today

Thursday 9 July

29°C

17°C

60 %

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Max wind speed: 20.0 km/h

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Frequently Asked Questions

Where can I park to access the Old Furnace Trail?

The Old Furnace Trail is located within Old Furnace State Park in Killingly, Connecticut. Parking is typically available at designated areas within the park. Look for signs indicating trailhead parking.

How difficult is the Old Furnace Trail?

The trail is generally considered of moderate difficulty, suitable for a range of hikers, including families. While some sections are relatively easy, it does involve ascents and steeper descents. The main loop often includes a climb of about 481 feet.

What kind of terrain should I expect on the trail?

You'll encounter diverse terrain, including mature forests, open meadows, streams, ponds, and wetlands. There are sections with ridges, ferns, and mountain laurels, as well as dramatic traprock cliffs and 'steps' formed by tree roots. Be aware that some areas might be flooded or slippery after rain, and there are segments with gravel and loose rock.

What are the main points of interest and views along the route?

The trail offers expansive views of Half Hill Pond (also known as Upper Ross Pond) and panoramic vistas across eastern Killingly and into Rhode Island from rocky outcrops. You can also see the historical remains of the Bog Furnace building, Ross Ledge, and a beautiful waterfall near the northern end. Don't miss the views from Half Hill.

Is the Old Furnace Trail dog-friendly?

Yes, the Old Furnace Trail is generally dog-friendly. However, it's always best to keep your dog on a leash and practice Leave No Trace principles by cleaning up after your pet.

What is the best time of year to hike this trail?

The trail offers beauty year-round. Fall is particularly vibrant with colorful foliage. Spring brings new growth and wildflowers, while summer provides lush greenery. Winter hiking is also possible, but be prepared for potentially icy or snowy conditions.

Are there any fees or permits required for Old Furnace State Park?

As of current information, there are typically no entrance fees or permits required to hike the Old Furnace Trail within Old Furnace State Park. However, it's always a good idea to check the official Connecticut State Parks website for any updated regulations before your visit.

Does this trail connect to other paths in the park?

Yes, the main 2.1 to 2.2-mile blue-blazed path can be combined with other trails within Old Furnace State Park to create longer hiking loops. The route also passes through sections of the Blue Trail and the Orange Trail.

What kind of plants and wildlife might I see?

The trail winds through a lush mix of deciduous and coniferous trees. You might spot diverse native plants such as skunk cabbage, cattails, waterlilies, and sometimes even pink lady's slippers or bright orange fungi. Keep an eye out for local wildlife typical of Connecticut woodlands.

Does the trail have any historical significance?

Yes, the trail is notable for its historical significance, particularly the remnants of the 18th-century iron works. The Bog Furnace played a crucial role during the Revolutionary War, supplying iron horseshoes to the Continental Army.

What should I wear or bring for a hike here?

Given the varied terrain and potential for slippery sections, sturdy hiking shoes are recommended. Dress in layers suitable for the weather, and consider bringing water, snacks, and a map or GPS device, as some blue blazes can be faded.

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