Old Windsor Mountain Road to Sulpher Hill Road

Total Miles 4.1
Technical Rating
4 Moderate
Best Time Spring, Summer, Fall
Trail Type High-Clearance 4x4 Trail
Accessible By
Open Trail Map

Trail Overview

This route travels on two NH Class 6 roads up and down Windsor Mountain and up and down Sulpher Hill. Like all Class 6 roads, these roads contain many easy sections and numerous challenging sections. The trail starts on a long uphill climb up the east side of Windsor Mountain. The ascent has several technical sections, with loose rock and some large rocks and granite steps that range from 10 to 18 inches. At the top of the first climb, the trail levels out and wanders through meadows. On the flat sections, you can expect mud and standing water of varying depths. This trail has numerous difficult technical sections that require larger off-road tires (recommend at least 33") and 4 low. You can do this in a stock 4x4, but expect to require a spotter several times, and you will bump your skid plates and rock rails. After turning east onto Sulpher Hill Road, the trail will begin another ascent up Sulpher Hill. Approximately 1.5 miles onto Sulpher Hill Road, you have a choice to travel straight up the hill (harder route) or turn right (easier route). Our track took the easier route, and those in our group who did the harder route all had lifted rigs with at least 35" tires. The Class 6 portion of Sulpher Hill Road ends in a residential neighborhood, so be sure to be respectful and tread slowly and lightly at this point.

Photos of Old Windsor Mountain Road to Sulpher Hill Road

Difficulty

Many technical sections with loose rocks, granite steps, and some larger boulders. If you take the more difficult route up Sulpher Hill you will need a built rig, ideally with a lift and at least 35" tires.

History

In New Hampshire, a Class VI road is a public way that is not maintained by the town or state. It's essentially a road that has been discontinued or has not been maintained for five years or more. These roads may include old public ways that were never built to acceptable standards, or stretches of road that have been formally discontinued or closed.

Technical Rating

4

Status Reports

Add Status Report
Bob D
May 09, 2026
Open
It was a rainy day with water running along the trail in many places. Traction was fine with aired down 35"s.
Richard Butzin
May 01, 2026
Open
I started on the north side (Sulfur Road). This was definitely not what I was expecting based off the other Class VI Roads I’ve been on up here during my visit. Today was pretty muddy. Lots of small running streams coming down some of the trails. The south side was very wet. There are some good technical spots regardless of direction. With 35s and 2inch I still managed to scrap 3 times on a skid plates. Not too bad though. A two door wrangler would have no problems with that at all. Biggest concern was the Sticks, branches, and downed trees. I had some long thin branches get hung up under me a few times and I’m sure my roof looks like Fredy Kruger drug his claw across it. Most of the muddy areas looked like some big truck had been through there and had gotten stuck some. Pretty rutted. Did manage to see this little critter out there though. Kinda cool never seen a porcupine before.
Adriel Desautels
Feb 13, 2026
Open
2023 Rivian R1S Quad with K03's on 20 inch EV Sportsline wheels. Rivial skids and Megawatt sliders... all put to good use on this trail. There are some major obstacles here like shelves that exceed 3 feet, massive boulders, steep slippery climbs up smooth rock faces, and more. It was a lot of fun but you need the right gear.
Todd s
Nov 02, 2025
Open
Great conditions. Mostly dry, some puddles here and there. some areas 4wd needed.
Anthony 4Runner
Oct 17, 2025
Open
This is pretty Technical ( on a dry day ) with some steep ledges, big boulder’s ( not Advised to do in Stock 4x4 or without sliders )
Julian Havelaar
Oct 04, 2025
Open
Entered from Liberty Farm Rd, first section definitely the hardest but was fine with 33s and a 2.5” lift. Used rear lockers twice but mostly because I didn’t fully air down. Definitely doable without lockers on 33s. Great view at the top after the tough climb.
Steve Anderson
Sep 14, 2025
Open
about as difficult of a road as you would want to do by your self. jeep had 33s and rear locker so not a real problem
Dan Davis
Sep 06, 2025
Open
I came up from the Liberty Farm Road side. It was a graet trail fairly technical in places for my jeep running 31s but manageable you are fairly committed once you start the rough section as it progressively gets more technical with little to no option to turn around but after that it is clear sailing on the decent. Over all fun trail bigger tires and locking diff would have made the rough section much nicer.
Gary Forbes
Aug 16, 2025
Open
Trailer was fun. There are a few technical areas that I passed going down hill, north to south that seemed like they might be harder to go up, south to north. If you take the offshoot that brings you down to the pond, it’s a nice play to take a break and enjoy the scenery.
Rob Burn
Jul 20, 2025
Open
I attempted this trail from the south. The climb up Windsor mountain has numerous rocks and ledges. I drove a stock Rivian R1S, with 34" tires and 15" ground clearance. I chickened out at the crux of the climb. My rig was too wide for one obstacle, and I wasn't willing to risk bashing the rockers (I don't have rail sliders) and/or getting stuck alone. I think a jeep with similar specs could have done it. I turned around, but would love to come back again and try from the other direction. The southern end of the trail goes through private property, though the owner has graciously left it open. Please be courteous to him and pick up any trash you see.

Old Windsor Mountain Road to Sulpher Hill Road Trail can be accessed by the following ride types:

  • Single Track
  • 50 Inch
  • 60 Inch
  • High Clearance

Old Windsor Mountain Road to Sulpher Hill Road Map

The onX Offroad Difference

onX Offroad combines trail photos, descriptions, difficulty ratings, width restrictions, seasonality, and more in a user-friendly interface. Available on all devices, with offline access and full compatibility with CarPlay and Android Auto. Discover what you're missing today!

Open Trail Map