Two years after the provincial government abruptly shut down the beloved Don Mills facility, the Ontario Science Centre finally has a front door again. On Monday, June 29, 2026, the interim location officially opened its doors at Toronto's Harbourfront Centre.
If you are expecting the sprawling, multi-level architectural marvel nestled in a Don Valley ravine, you need to adjust your expectations immediately. The new temporary space covers roughly 86,000 square feet. That sounds decent until you realize the original building was a massive 568,000 square feet. This new waterfront footprint is roughly 15 percent of the size of the place you grew up visiting.
Despite the dramatic downsizing, writing this off as a total loss is a mistake. The interim setup serves a specific purpose, and for families looking for summer activities along the lake, it brings back a necessary dose of hands-on education.
Let's cut through the political talking points and look closely at what is actually inside, what it costs, and whether it is worth your time.
Inside the Waterfront Footprint
The temporary home splits its programming into distinct areas designed to squeeze as much interactivity as possible into a smaller footprint. The provincial government and science centre staff have focused heavily on space, engineering, and sports for this first phase of the launch.
Space Deck
The standout attraction here is an immersive planetarium experience that lets you observe the night sky and journey through the stars. They brought in a real piece of the Moon for visitors to view up close. Interactive components let kids play with a plasma ball to see how the northern lights form and experience simulated gravitational forces near a black hole model. It also highlights Canadian space exploration history.
Innovation Station
This section is a dedicated maker space focused on building and testing. It features real tools and a wide array of materials. The primary draws are the ball fall wall and a shake table where you build small structures and test their stability against simulated earthquakes. The design focus here leans heavily toward open-ended problem solving rather than rigid instructions.
Curiosity Commons
Taking advantage of the waterfront location, this is an outdoor space dedicated to sports science. Since Toronto is heading into a busy summer of sports, the programming connects physical movement to scientific principles. Visitors can test their skills at baseball, ping pong, and soccer while looking at data that tracks the physics of athletic performance and human movement.
KidSpark
Parents will be glad to know that KidSpark made the move. Long considered the gold standard for early childhood science programming in the city, this interactive exhibition hall has been adapted for the Harbourfront site to serve younger children who need tactile, play-based learning.
The Elephant in the Room is the Space Crisis
We should be entirely honest about the numbers here. Losing 85 percent of your operational real estate means major compromises. You won't find the iconic rainforest exhibit here. The massive IMAX theatre is gone. The long walkways that let kids burn off energy between exhibition halls don't exist in this layout.
Tourism, Culture and Gaming Minister Stan Cho stated during the opening that the old building had its day, pointing squarely to the structural issues that forced its closure. The government claims the new waterfront location will drive foot traffic to local businesses and activate the Harbourfront campus year-round.
Critics and opposition politicians view this temporary site differently. Two years ago, the sudden closure of the original building was blamed on urgent roof repairs due to degrading autoclaved aerated concrete panels. That explanation remains a point of deep contention among structural engineers, architectural preservationists, and local community groups who argued the facility could have been repaired section by section without a total shutdown.
While the political fight over the old site continues, the reality for Toronto families is that a bridge solution was desperately needed. The science centre had been running minor pop-up exhibits across the city, but it lacked a true central hub. This Harbourfront location acts as that bridge until the permanent, 400,000-square-foot facility opens at Ontario Place, which is currently scheduled for 2029. Shovels went into the ground for that project in May, but a three-year gap is a long time in a child's educational development.
Is It Worth the Admission Price
The science centre has set admission at $15 per person, tax included. That is a flat rate across different age groups for this interim phase, making it significantly cheaper than a standard ticket at the old Don Mills location used to be.
If you are a tourist looking for an all-day museum marathon, this temporary site will probably feel underwhelming. You can comfortably experience everything currently open within two to three hours. However, if you view it as a high-quality, interactive neighborhood hub integrated into a larger day out at the lake, the value proposition changes completely.
The hours are generous for the summer season. It is open Sunday through Friday from 10 AM to 6 PM, and Saturdays extend until 8 PM. This includes holiday weekends, making it a highly accessible option for weekend trips downtown.
What to Do Next if You Plan to Visit
Do not just show up unannounced on a hot weekend afternoon expecting an easy entry. The smaller indoor square footage means capacity limits will hit much faster than they ever did in the old ravine building.
- Book your tickets online in advance. Go directly to the official Ontario Science Centre website to secure a specific time slot. This is the only reliable way to avoid being turned away at the door when the pavilions hit maximum capacity.
- Leverage public transit. Parking at the waterfront is notoriously expensive and scarce. Take the TTC to Union Station and hop on the 509 or 510 streetcar down to Harbourfront Centre, or take the short walk south from the station.
- Combine the trip with outdoor activities. Since the indoor space is smaller, plan a split day. Spend two hours inside the Space Deck and Innovation Station, then spend the rest of your afternoon utilizing the free outdoor programming at Curiosity Commons and walking the boardwalk.
- Watch for phase two updates. This June launch is only the first phase. The science centre management indicated that additional exhibits, workshop spaces, and specialized programs will roll out later this autumn, expanding the experience further.
The temporary Ontario Science Centre cannot replace the architectural grandeur or the scale of its predecessor. It is a compromise born out of political battles and infrastructure failures. But inside the walls of the Harbourfront Centre, the frontline staff have managed to preserve the core mission of the institution. The scale is small, but the curiosity driving the experiments remains exactly the same.
