Losing the Night
For centuries, Nantucket’s dark skies were a matter of course. Today, preserving the stars requires a battle against "lumen creep."
Cape Cod Times/Bill Hoenk
The Milky Way rises over the Tom Nevers guardhouse, where a window installation, The Kiss, adds a subtle point of light beneath one of New England’s clearest night skies
Kayley Jensen • April 16, 2026
In April, Nantucket pauses to look up, marking International Dark Sky Week (April 13-20) with the familiar language of preservation, heritage and a night sky still visible in ways that have disappeared elsewhere. It's an idea that runs deep on the island, reinforced not only through culture and memory, but through regulation. Nantucket’s outdoor lighting bylaw is unusually explicit in its intent, aiming to limit skyglow, reduce light trespass, and preserve the visibility of the stars, including the Milky Way, while supporting the work of the Maria Mitchell Association.
The rules are clear and measurable. Exterior lighting must remain warm in tone, generally below 2700 Kelvin, brightness is capped according to parcel size, fixtures above modest output must be shielded to prevent light from escaping upward, and most nonessential lighting is expected to turn off by 11 p.m. The bylaw applies broadly, covering private homeowners, commercial properties, and municipal infrastructure alike, establishing a framework for how the island should look after dark.
That framework is now in place, but the night on Nantucket is no longer uniform.
A Measurable Shift
Recent sky-quality monitoring conducted by Nantucket Lights shows that the island is already brighter than its natural baseline, with average conditions approaching the threshold where the Milky Way begins to fade from view. The change is not evenly distributed. In places like Madaket or near Altar Rock, darkness still settles in fully, while in Town, near the airport, and around the elementary school, the sky carries a persistent glow.
These differences are recorded across a network of monitoring sites that includes Nantucket Town, Surfside, ‘Sconset, Wauwinet, the airport, and the school area, producing a consistent pattern in which brightness tracks directly with development. Where the island is built, it is brighter, and that brightness is beginning to reshape the experience of the night.
Some of the most significant sources of that light are not private homes, but public and institutional sites already identified in town-supported analysis. A municipal lighting inventory pointed directly to Nantucket Memorial Airport, the Nantucket Public Schools complex, particularly around the elementary school, and the Nantucket Landfill as the largest concentrations of problematic lighting.
Each of these sites serves a necessary function, and in each case lighting is tied directly to safety and operation. The airport cannot function without extensive illumination, school facilities require visibility for security and access, and the landfill operates within an industrial footprint that often extends beyond daylight hours. These realities place them within the bylaw’s allowances for safety and operational necessity, but not outside its scope.
This creates a structural tension. Even when lighting is justified and technically compliant, it still contributes to the island’s overall brightness, meaning that some of the most significant sources of skyglow are also the most difficult to reduce.
Downtown and the Accumulation of Light
If those municipal sites represent concentrated brightness, Downtown Nantucket reflects a different kind of impact, one driven by accumulation. Storefront lighting, signage, patios, entryways, and decorative fixtures combine to create a steady ambient glow that persists well into the night.
The bylaw still governs these conditions, requiring shielding, limiting brightness, and calling for most lighting to be turned off by 11 pm, but enforcement becomes diffuse in practice. The distinction between compliance and excess is less visible when spread across dozens of properties, and the cumulative effect is not tied to any single violation, but to many small decisions made over time. The result is a downtown that rarely fully darkens, where the glow lingers even as activity fades.
That gradual accumulation is mirrored in the town’s own infrastructure, where the transition to compliance is still underway. On Main Street, new decorative lighting has been tested and installed to better align with the bylaw’s standards, suggesting that earlier fixtures did not fully meet current expectations.
The extended compliance window, which runs toward 2029, reflects more than simple delay. Retrofitting lighting systems, particularly at the municipal level, is not a small adjustment. It involves replacing hundreds of fixtures across schools, public works sites, and roadways, often requiring new equipment, rewiring, and coordination across departments. In some cases, lighting must be redesigned rather than simply swapped, especially where safety and visibility are factors. Cost, logistics, and the scale of existing infrastructure all contribute to the timeline, turning what might appear to be a straightforward policy change into a multi-year transition.
The same is true, in a different way, for private properties. Existing homes are not required to immediately replace all nonconforming lighting, allowing time for gradual compliance. The result is an island operating within a phased system, where some properties reflect the new standards, others predate them, and many fall somewhere in between.
Maria Mitchell Association
Seen from space, Nantucket appears as a small point of light off the Massachusetts coast. On the ground, that glow comes at a cost — light pollution that is gradually diminishing the island’s night sky. Today, roughly two-thirds of Americans can no longer see the Milky Way due to artificial light. Nantucket still holds places where stars stretch horizon to horizon, but preserving that view will require deliberate effort
The Private Side
The impact of private development is less centralized but increasingly visible. In a 2022 filing before the Historic District Commission tied to a property at 7A Clifford in Surfside, an abutter described a neighboring compound with extensive exterior lighting, including bright spotlights, a fully illuminated pool area, and lights left on late into the night or throughout it, with light entering adjacent homes and altering the surrounding environment.
The memo predates the current bylaw and does not establish a violation under present standards, but it captures a pattern that has become more common. Large compounds now routinely include pools, pergolas, landscape lighting systems, and layered exterior illumination designed to extend the use of outdoor space into the night. A 2025 HDC filing for 5 Weetamo Road reflects the scale of these projects, showing extensive site planning that includes pool infrastructure and landscape design elements, each of which may introduce additional lighting.
The bylaw establishes clear technical standards, requiring shielding for higher-output fixtures, limiting color temperature, restricting light trespass, and setting expectations for overnight shutoff between 11 p.m. and 6 a.m. These standards can be reviewed on paper in submitted plans, where fixture types and layouts are presented to the Historic District Commission.
What those plans do not reliably show is how lighting functions once installed. Filings rarely include complete lumen calculations, detailed shielding specifications, or operational programming that confirms when lights will be turned off or how systems will be used in practice. As a result, the connection between approval and actual conditions remains difficult to verify without direct inspection.
Enforcement, as structured today, is largely complaint-driven. The bylaw designates a Lighting Enforcement Officer, a role held by Marcus Silverstein, who serves as the town’s Zoning Compliance Coordinator and is responsible for responding to concerns, reviewing potential violations, and guiding compliance. The code outlines penalties and provides a formal pathway for enforcement, but there is no visible system of routine, island-wide nighttime inspections.
In practice, lighting issues are most likely to surface when a neighbor notices them, when light crosses a property line, or when brightness becomes difficult to ignore. Residents are directed to contact the town directly to report concerns, typically by phone or email, which places the burden of identification largely on those experiencing the impact. Absent a complaint, many installations may never be formally reviewed once they are in place.
This creates a gap between design and reality, where a property may meet the intent of the bylaw on paper, while operating differently once occupied.
What the Island Decides
Nantucket’s dark sky has never been accidental. It has existed because the island remained underlit relative to the mainland, preserving a condition that required little active management. That condition is changing, gradually but measurably, as development expands and lighting becomes more integrated into both public and private spaces.
The bylaw represents an effort to define limits before that change becomes irreversible, but the outcome depends on how those limits are applied in practice. The data shows the shift is already underway, while the town’s own infrastructure reflects the difficulty of aligning necessity with preservation. Private development adds another layer, more distributed and less visible, but equally influential in shaping the night.
The question is no longer whether Nantucket values its dark sky, but whether the current system of rules, approvals, and enforcement is sufficient to preserve it as the island continues to evolve, one fixture, one property, one illuminated space at a time.
For outdoor lighting complaints/violations, call Nantucket's Lighting Enforcement Officer, Marcus Silverstein, at 508-325-7587, ext. 7021 or send an email to msilverstein@nantucket-ma.gov