Callahan State Park (entrance) – Sudbury Reservoir loop from Advanced Math and Science Academy Charter School
Callahan State Park (entrance) – Sudbury Reservoir loop from Advanced Math and Science Academy Charter School
3.4
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riders
Callahan State Park (entrance) – Sudbury Reservoir loop from Advanced Math and Science Academy Charter School
01:28
31.9km
250m
Road cycling
Easy road ride. Great for any fitness level. Mostly well-paved surfaces and easy to ride. The starting point of the route is right next to a parking lot.
Last updated: May 28, 2026
Tips
Your route passes through a protected area
Please check local regulations for:
Sudbury Dam Historic District
Waypoints
Start point
Parking
Get Directions
4.45 km
Marlborough
Highlight • Settlement
Tip by
4.67 km
Marlborough
Highlight (Segment) • Settlement
Tip by
9.29 km
Parmenter Street
Highlight (Segment) • Cycleway
Tip by
11.8 km
Callahan State Park (entrance)
Highlight • Rest Area
Tip by
12.6 km
Overly Conservation Restriction
Nature Reserve
23.5 km
Sudbury Reservoir
Highlight • Lake
Tip by
27.5 km
View of Wachusett Reservoir
Highlight • Lake
Tip by
31.9 km
End point
Parking
Way Types & Surfaces
Way Types
29.5 km
1.18 km
595 m
564 m
Surfaces
29.6 km
1.92 km
341 m
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Elevation
Highest point (150 m)
Lowest point (60 m)
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Weather
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Today
Wednesday 15 July
33°C
22°C
0 %
Additional weather tips
Max wind speed: 21.0 km/h
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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.
Description
If you're looking for an accessible and varied road cycling experience in MetroWest Massachusetts, the Callahan State Park (entrance) – Sudbury Reservoir loop from Advanced Math and Science Academy Charter School is an easy route that delivers. Covering 19.8 miles (31.9 km) with 812 feet (248 metres) of elevation gain, you can complete this loop in about 1 hour and 27 minutes, making it a great option for a relaxed ride through New England nature.
What to expect on Callahan State Park (entrance) – Sudbury Reservoir loop from Advanced Math and Science Academy Charter School
Expect a journey through quintessential New England landscapes, starting near the Advanced Math and Science Academy Charter School and winding through the diverse ecosystems of Callahan State Park. You'll cycle past extensive woodlands, open fields, and wetlands, with opportunities to spot wildlife like white-tailed deer. A major highlight is cycling along the Sudbury Reservoir, offering picturesque vistas of the water's edge. The terrain features rolling hills, but by sticking to well-planned paved sections, this route remains easy and suitable for cyclists of all fitness levels, avoiding the challenging mountain biking trails within the park.
Planning your visit
While this specific loop isn't a pre-defined trail, its proximity to the Advanced Math and Science Academy Charter School in Marlborough makes it geographically feasible. You'll need to consult detailed maps to plan a route that primarily uses paved roads and only enters Callahan State Park where suitable for road bikes, potentially utilizing well-maintained fire roads or known paved sections. Be aware that dogs are not allowed on Department of Conservation and Recreation (DCR) property within the Sudbury Reservoir watershed. The best season for road cycling in this area is typically spring through fall, avoiding winter conditions.
Trail details
- Distance: 19.8 miles (31.9 km)
- Elevation gain: 812 feet (248 metres)
- Difficulty: easy
- Estimated time: 1 hours and 27 minutes
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