3.0
(3)
49
riders
7
rides
Mountain bike trails in Assabet National Wildlife Refuge span over 2,200 acres across Hudson, Maynard, Stow, and Sudbury, Massachusetts. The refuge, a former U.S. Army training annex, features a diverse landscape of forests, wetlands, and open meadows, with the scenic Assabet River flowing through. Riders can expect a mix of surfaces, including wide, hard-packed dirt roads and paved sections, with elevation gains suitable for various skill levels.
Last updated: July 12, 2026
3
riders
13.4km
00:55
60m
60m
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
2
riders
12.8km
00:54
40m
40m
The Assabet River Dam loop from Lake Boon offers a delightful mountain biking experience, winding through the varied terrain of the Assabet River National Wildlife Refuge. You'll encounter a mix…

Sign up for free
3
riders
23.8km
01:36
80m
80m
The GFWCM Memorial Forest loop from Sudbury offers a distinctive mountain biking experience, taking you through a landscape unlike many others in Massachusetts. You'll ride through areas known as "the…
13
riders
6.91km
00:45
210m
220m
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
3.0
(3)
10
riders
12.4km
01:08
170m
170m
The Coco Ridge Trail, Birch Trail, & Red Tail Trail mountain biking loop offers a pleasant and varied ride through Callahan State Park. You'll experience diverse terrain, from smooth connectors…
Get access to more routes and recommendations from other explorers.
Sign up for free
Already have an account?
Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.
Start today with a free account
Your next adventure awaits.
Login or Signup
This point in the trail is the highest elevation in the reservation, and offers a nice lookout, but we thought the radio tower and fire tower were also really cool to see!
1
0
A really beautiful piece of nature. Here you can relax in many ways and even spend a whole day with children, picnic, sports and games
0
0
Located in the town of Sudbury, the Hopbrook Marsh Conservation Land has a size of 80 acres and features different landscapes such as wetlands, floodplains, meadows, and forests. It includes multiple hiking trails with wooden bridges and is a great spot to spot wildlife like frogs, turtles, salamanders and various birds.
0
0
Red Tail Trail is a connector trail from or to the south side of Callahan State Park. It is an easy and non-technical trail that features wonderful views over the park.
1
0
Birch Trail is a fun trail with some tiny kickers for an extra dosage of adrenaline.
1
0
Coco Ridge trail is an easy trail that leads to Juniper Trail, Birch Trail and Pinecone Trail and is fun in either direction.
0
0
The Assabet is a "working river" and observed from above, it seems to be stapled to the landscape by bridges. Over its 31-mile route, more than 40 bridges span it.
0
0
The Assabet River, Oxbow, and Great Meadows are three of the eight refuges that make up the Eastern Massachusetts National Wildlife Refuge complex. A wide variety of migratory birds, mammals, plants, reptiles and amphibians can be found here.
0
0
The Assabet National Wildlife Refuge offers a selection of mountain bike trails, with about half of its 15 miles of trails open for cycling. Komoot features 8 distinct mountain bike tours in the area, catering to various skill levels.
Yes, the refuge has several trails suitable for beginners. You can find easy rides with minimal elevation gain (STS S0-S1). For example, the Callahan State Park loop from Nobscot Reservation is an easy 4.3-mile trail that takes about 45 minutes to complete.
Riders can expect a diverse mix of surfaces, including wide, well-maintained hard-packed dirt roads and paved sections. The trails traverse varied landscapes such as extensive forests, vital wetlands, and open meadows, with the scenic Assabet River flowing through the area.
While many trails are accessible, there are also routes that offer more challenge for experienced riders, requiring good fitness and advanced riding skills (STS S2-S6). The Birch Trail Kicker – Coco Ridge Trail loop from Wayside Woods is a moderate 15.0-mile path that traverses diverse forest and wetland habitats, providing a longer and more demanding experience.
Yes, the refuge features several loop options for mountain bikers. Notable loops include the Pine Point Lot loop, Callahan State Park loop, and Flagg Hill loop. Additionally, the Coco Ridge Trail, Birch Trail, & Red Tail Trail loop — Callahan State Park is a popular 7.7-mile route.
The refuge is a significant site for biodiversity, so you might encounter a variety of wildlife. This includes waterfowl, wading birds, songbirds (like eastern towhees and scarlet tanagers), raptors, American beaver, bobcats, and white-tailed deer. It's also a vital stopover point for migratory birds.
Many of the trails, particularly the easier routes with minimal elevation gain and hard-packed surfaces, are suitable for families. The diverse and engaging environment makes it a great place for outdoor activities with children, though it's always good to check specific trail details for suitability.
The Assabet National Wildlife Refuge generally allows dogs on trails, but they must be kept on a leash at all times. It's always a good idea to check the latest regulations on the official refuge website before your visit to ensure compliance.
The refuge provides parking facilities for visitors. The visitor center on Winterberry Way serves as a gateway to the refuge and is a common starting point. Specific trailheads and loops like the Pine Point Lot loop also indicate available parking areas.
Beyond the trails, the refuge boasts diverse habitats including extensive forests, wetlands, and open meadows. The scenic Assabet River flows through the area, and Puffer Pond is a key attraction, offering accessible fishing piers and opportunities to observe great blue herons. The wetlands and vernal pools are also significant for migratory birds and amphibians.
The refuge offers enjoyable mountain biking throughout much of the year. Spring and fall provide pleasant temperatures and vibrant scenery. Summer can be warm, but shaded forest trails offer relief. Winter mountain biking is also possible, though trail conditions may vary with snow and ice.
The mountain bike routes in Assabet National Wildlife Refuge are highly rated by the komoot community, with an average score of 3.0 stars from over 5 reviews. Riders often praise the diverse terrain, the mix of hard-packed dirt roads and paved sections, and the opportunity to explore the refuge's extensive forests and wetlands.


Browse the best MTB trails in other regions.