Parks Canada’s dark sky preserves are havens of night in an increasingly over-lit world.


In 1994, Los Angeles got a rare reminder that there was in fact a universe beyond Hollywood.

In that year, the city suffered a major blackout as a result of the Northridge earthquake. According to newspaper reports, a number of anxious residents called emergency centres to report a strange silvery cloud in the sky.

That cloud was in fact the Milky Way. The callers were looking out at their own galaxy for the first time.

For Parks Canada, the Milky Way is as much a part of nature as forests, mountains and seascapes. The agency is a world leader in night skies conservation and manages 10 of the country’s 17 “Dark Sky Preserves”—areas of natural darkness designated by the Royal Astronomical Society of Canada (RASC).

An eleventh site, Waterton Lakes National Park, recently received a Dark Sky Park designation by the International Dark-Sky Association. The park is in the process of obtaining a Dark Sky Preserve designation by Canada’s own RASC.

The Milky Way with treetops on horizon
The Milky Way over the shore at Lake Annette during the 2013 Dark Sky Star Party in Jasper National Park.

A partisan of darkness

Dr. David Welch

Dr. David Welch has been working to protect the night for more than two decades. A physical geographer and retired Parks Canada scientist, he is currently Chair of the Dark Skies Advisory Group of the International Union for Conservation of Nature.

During his career as Earth Sciences Advisor and (later) Head of Environmental Quality at Parks Canada, Dr. Welch studied a range of air quality issues including acid rain, climate change and air pollution. Light pollution was “tucked away in a small corner of all that,” he says.

But the topic caught his attention, and working with Parks Canada’s Asset and Environmental Management team, he helped draft the lighting guidelines for Dark Sky Preserves.

These requirements were adopted by the RASC and, eventually, by the International Dark-Sky Association, which made them part of their recommendations for responsible lighting.

Windows on the universe

Parks Canada’s dark sky preserves have many visitor activities related to dark skies, including.

  • Bruce Peninsula National Park
    The site of Dark Skies Weekend, hosted by the Bluewater Astronomical Society every July. The park also offers weekly night hikes in both summer and fall.
  • Kejimkujik National Park and National Historic Site
    Offers a self-discovery Dark Sky Kit including binoculars, games for children, a star finder, a stargazing guide, and a red light for reading graphs and maps at night.
  • Wood Buffalo National Park
    The world’s largest dark-sky preserve. At its annual Sky Festival in late August, members of the Salt River First Nation present drumming and hand games, and share Indigenous stories of the night skies.

Islands of night

Light pollution can interfere with ecological processes that depend on the natural cycle of sunlight and darkness.

Bats, owls, insects and amphibians all depend upon darkness to mate and find food. Certain species of birds navigate using the stars.

In many animals, including humans, exposure to light at night interferes with the production of the hormone melatonin. Some research has linked suppression of melatonin with an increased risk of breast and prostate cancer in humans.

Dark sky preserves are reclaiming the night for people and wildlife. To receive official designation, they must meet standards of responsible lighting and public outreach.

These areas of darkness help conserve energy, reduce greenhouse gas emissions, protect the night for wildlife, and allow visitors to see where they are in the cosmic scheme of things.

Dr. Welch is pleased by the country’s progress in reclaiming our night skies, but he looks forward to the day when pure darkness is restored to all our protected areas. “My original idea,” says, “was that every park should be a dark-sky park by default.”



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