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Hiking trails & Routes
United States
Connecticut
Northeastern Connecticut Planning Region
Mechanicsville

Air Line Trail to Tri-State Marker

Hard

4.7

(8485)

8,486

hikers

Air Line Trail to Tri-State Marker

06:14

24.1km

140m

Hiking

Hike the challenging 15.0-mile Air Line Trail to the historic Tri-State Marker, where Connecticut, Massachusetts, and Rhode Island meet.

Last updated: February 26, 2026

Waypoints

A

Start point

Parking

Get Directions

1

63 m

Air Line Trail

Highlight (Segment) • Trail

The Air Line was once a high-speed passenger railroad line connecting New York to Boston. Today, it has been transformed into a 55-mile trail that caters to hikers, runners, and bikers, passing by parks and several bodies of water.

Tip by

2

12.2 km

Tripoint marker

Highlight • Monument

This granite monument marks the border of Connecticut, Massachusetts and Rhode Island. It was set over 130 years ago. The mountain bike trails in the area great too.

Tip by

B

24.1 km

End point

Parking

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Way Types & Surfaces

Way Types

22.9 km

1.04 km

116 m

Surfaces

23.8 km

222 m

116 m

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (180 m)

Lowest point (100 m)

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Weather

Powered by Foreca

Today

Sunday 12 July

28°C

14°C

0 %

Additional weather tips

Max wind speed: 10.0 km/h

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Frequently Asked Questions

Where can I park to access the Air Line Trail to the Tri-State Marker?

While specific parking details for the Tri-State Marker section are not provided, the Air Line Trail generally has various access points along its length. It's advisable to research the closest trailhead parking to the starting point of your planned hike towards the marker.

What is the terrain like on the way to the Tri-State Marker?

The initial section of the route follows the Air Line Trail, which is typically flat with surfaces ranging from packed earth and crushed stone to gravel and some paved sections. However, the spur leading directly to the Tripoint marker deviates significantly, becoming a challenging uphill and rocky climb for approximately 0.68 miles.

Is the Air Line Trail to the Tri-State Marker dog-friendly?

Yes, the Air Line State Park Trail, which includes this route, is generally dog-friendly. Dogs are typically allowed but must be kept on a leash. Always ensure you clean up after your pet to maintain the trail's cleanliness.

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

The route can be enjoyed in various seasons. Spring and fall offer pleasant temperatures and beautiful foliage. While the main Air Line Trail is accessible, the challenging, rocky section to the Tripoint marker might be more difficult in wet or icy conditions, so consider this for winter or early spring hikes.

Are there any permits or entrance fees required for the Air Line State Park Trail?

No, there are typically no permits or entrance fees required to access the Air Line State Park Trail. It is a public trail system, making it freely accessible for hikers.

What are the main points of interest along the route?

The absolute highlight of this route is the historic Tripoint marker itself, where you can stand in Connecticut, Massachusetts, and Rhode Island simultaneously. Along the broader Air Line Trail, you might also encounter historic features like the Rapallo and Lyman Viaducts, offering stunning views, though their proximity to this specific route may vary.

Is this hike suitable for families or beginner hikers?

The main Air Line Trail is generally considered easy and suitable for families. However, the specific segment leading to the Tripoint marker is rated as moderate to challenging due to a significant uphill and rocky climb. Beginners or families with young children might find this final section quite strenuous.

Does this route connect with other trails?

Yes, the route primarily follows the Air Line Trail, which is part of the extensive Air Line State Park Trail system. It also connects to other trails like the Southern New England Trunkline Trail, Tri-State Marker Loop Trail, and Tri-State Marker Trail, offering options for longer or alternative explorations.

What kind of scenery and wildlife can I expect to see?

The route offers beautiful scenery with abundant greenery, secluded areas, and passages through forests and along wildlife management areas. You can expect to see typical New England woodland wildlife, including various bird species, deer, and smaller mammals. The Tripoint marker itself is on a high point, offering views, especially through the trees.

Are there any amenities like restrooms or water sources along the trail?

The Air Line Trail is a relatively undeveloped rail trail, so dedicated restrooms or potable water sources are generally not available directly on the trail. It's recommended to bring your own water and plan for restroom breaks before or after your hike.

What should I wear and bring for this hike?

Given the varied terrain, including rocky uphill sections, sturdy hiking boots with good ankle support are highly recommended. Dress in layers suitable for the weather, and bring plenty of water, snacks, a map or GPS device, and sun protection. Trekking poles can be helpful for the challenging climb to the Tripoint marker.

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