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Assabet River National Wildlife Refuge
4.7 ★★★★★ 689 Google reviews · Running trail in Sudbury, Massachusetts · Posted hours
Runner's snapshot
- Surface
- Paved
- Loop distance
- 15 mi
- Shape
- Loop
- Shade
- Not reported
- Access
- Posted hours
Confirmed from Assabet River National Wildlife Refuge'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.
Small protected area with wetlands, forested areas & vernal pools for wildlife, plus public trails.
What runners say about Assabet River National Wildlife Refuge
“We were alongside the Assabet River, and there was a beautiful Bald Eagles nest high up in a tree where all were able to see them flying overhead.”
A great place for a hike, but buggy in the summer. I've been twice, both during the week, and it was practically deserted both times - perfect for anyone who wants some quiet. The disused ammunition bunkers are an interesting piece of local history.
Great area to explore old WWll grounds. Mostly flat with some old paved walkways. Lots of seemingly random paths that will take you all over the area. Perfect for a 30 minute walk or hours long exploration.
The bunkers and the ponds were the highlights. Awesome weathered bunkers throughout the trails from WW2, ponds left and right with many birds. Beautiful views in the winter, can’t wait to see them in the summer. It’s a 8 mile hike if you do the whole loop. Definitely worth it.
I loved the place. The lake is beautiful and relaxing. Fishing is admitted. Trails are very well maintained. It's a good place to enjoy with family but also for young people!
Trail conditions & character
“We were alongside the Assabet River, and there was a beautiful Bald Eagles nest high up in a tree where all were able to see them flying overhead.”
“Would recommend doing the loop trail from the visitor center.”
“Google didn't take me to the welcome center, it was a smaller parking area on the opposite end behind a neighborhood.”
“The trails are large, well marked and paved in some cases.”
“There are many paths through the forest and around the lake, some bringing you right down to water level.”
Plan your run at Assabet River National Wildlife Refuge
The practical stuff
- AccessPosted hours — posted hours below; park gates sometimes close earlier than the listing says
- SurfacePaved — asphalt or concrete. Fast and predictable, runnable year-round, and fine with a stroller
- Loop distance15 mi back to where you parked. Long enough for a real long run.
- ShadeNot reported. Assume some of it is exposed and carry water in summer.
- At the trailheadparking — reported by runners
- Websitefws.gov
- Phone+1 978-562-3527
- Social Instagram · Facebook
Hours
| Monday | 6 am–6 pm |
| Tuesday | 6 am–6 pm |
| Wednesday | 6 am–6 pm |
| Thursday | 6 am–6 pm |
| Friday | 6 am–6 pm |
| Saturday | 6 am–6 pm |
| Sunday | 6 am–6 pm |
Running trails near Sudbury
Other trails within easy driving distance — useful when this one is flooded, gated, or just not the run you had in mind today.
Assabet River Rail Trail
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Children are welcome at this park where visitors can hike and bike.
Marlborough-Sudbury State Forest
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This state conservation area with woods & streams offers several moderate hiking trails.
Sudbury Conservation
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The Desert Natural Area Conservation Land
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Assabet River Walk
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