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Onion Mountain Park
4.4 ★★★★☆ 31 Google reviews · Running trail in West Simsbury, Connecticut · Hours vary
Runner's snapshot
- Surface
- Natural surface
- Distance
- Not reported
- Shape
- Not reported
- Shade
- Not reported
- Access
- Not reported
Confirmed from Onion Mountain Park's own listing, the park or land manager's website, and runner reviews. Blank cells mean we could not verify that fact — we would rather say "not reported" than invent one. There is no Easy / Moderate / Hard rating on this page on purpose: a one-word difficulty score tells you nothing about whether a trail suits your run. Surface, distance, shade and hours do.
What runners say about Onion Mountain Park
Solid workout. Terrain is up and down. There are some short, but steep climbs. Beautiful view!
I took the orange trail up to the top and then to the south along the ridgeline. There is a point that the trail forks, and the orange path continues to the right. At this point the trail devolves in bramble and ledge, and you almost have to navigate by intuition to find the orange markers.
Today I did the loop from the alltrails app and it says such a beautiful hike up lots of rocks rambles and a steep part once you get to the top but there is a nice view once you get up there beautiful Moss all throughout the trail I also saw a lot of little creatures like to salamanders a big spider and snake.
Fantastic trail with different options and degrees of difficulty. My only recommendation is that you bring poles so that you have better balance. Especially during the fall when it is covered in leaves. Worth going when the fall colors change :)
Trail conditions & character
“At this point the trail devolves in bramble and ledge, and you almost have to navigate by intuition to find the orange markers.”
“I just stopped in the parking lot to eat lunch during the work day.”
“Tightwalking across logs, I get a bit muddy but manage.”
Plan your run at Onion Mountain Park
The practical stuff
- AccessHours vary — hours are not posted for this trail, so check before an early or late run
- SurfaceNatural surface — easiest on the joints and the most fun, but expect roots, rocks and mud after rain
- DistanceNot reported. Trail systems often quote total path mileage rather than a single loop, so measure the route you actually want before you drive out.
- ShadeNot reported. Assume some of it is exposed and carry water in summer.
- At the trailheadparking — reported by runners
Running trails near West Simsbury
Other trails within easy driving distance — useful when this one is flooded, gated, or just not the run you had in mind today.
Hedgehog Trail
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Stratton Brook State Park
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Beautiful park featuring a lake with a beach and trails, as well as a small pond.
