What started as a lockdown nature project is now a nationwide tradition, and it’s growing again in its fifth year.
The Big Backyard BioBlitz, hosted by the Nature Conservancy of Canada (NCC), is back from July 28 to August 4.
Canadians of all ages can observe and document local plant and animal species. They can share their findings by using the free iNaturalist app.
Launched in 2020 during the COVID-19 pandemic, the initiative was created to inspire outdoor exploration while supporting real-time biodiversity tracking.
This year’s event marks a milestone with its first full week-long format, allowing more time for families, workplaces and classrooms to participate.
“Scientists can’t be in every backyard or local park,” Mark Frank, NCC’s development officer in Atlantic Canada, said.
“But when thousands of people contribute observations from across the country, it gives us a much clearer picture of what’s going on with species and habitats.”
Since it started, the BioBlitz has made over 193,000 observations. It has identified more than 8,600 species, including rare, invasive, and at-risk wildlife.
In 2024, Canadians submitted more than 45,000 sightings, with nearly 7,700 from Atlantic Canada alone.
While monarch butterflies and milkweed remain among the most photographed, Frank encourages participants to go deeper.
“Last year I focused on bees, because they’re often overlooked,” he said.
“This year, I’m challenging myself to identify as many tree species as I can in my neighbourhood. It’s amazing how much we walk past without knowing.”
Participants don’t need a science background to take part. After registering, users can access tools and tips for using the app.
The Kids’ Corner includes nature-themed games, printable activities and scavenger hunts designed to engage younger explorers.
“I usually keep my phone tucked away when I’m outside,” Frank said.
“But in these weeks, I make an exception—stop mid-hike, take a 360-degree look, and document every species I can see. It changes how you experience your environment.”
The BioBlitz is free and open to everyone. Submissions must be uploaded between July 28 and August 4.
