Boyd's Windmill

Boyd's Windmill is an octagonal timber structure in Rhode Island that grinds grain using rotating canvas vanes. The building features a movable cap system that allows the vanes to turn toward the wind and keep the grinding stones continuously powered.

The building was constructed in 1810 in Portsmouth and later came under the control of William Boyd, who used it for local grain processing. The mill was subsequently moved to Paradise Valley Park, where it can now be visited.

The structure represents early American agricultural technology, with grinding stones made from Fall River granite that process grain through a precise mechanical system.

Visits happen on Sunday afternoons from July through September when volunteer-led tours are available. Guests should check ahead since hours may change based on weather and staff availability.

The upper grinding stone rotates exactly six times for each turn of the main shaft, processing grain with two-ton stones spanning 25 feet in diameter.

Location: Rhode Island

Opening Hours: Sunday 14:00-16:00

GPS coordinates: 41.50070,-71.26960

Latest update: December 14, 2025 09:41