Costco Is Coming to Newmarket – Here’s Everything You Didn’t Know
Newmarket, brace yourself. The town is about to get a major retail shake-up as Costco Canada officially locks in August 20, 2025 as the opening date for its brand-new mega warehouse on Harry Walker Parkway South.
This isn’t just another retail addition—it’s a full-scale retail power move.
The new facility spans over 15,000 square metres, with hundreds of parking spaces, a Costco gas bar, and even additional retail units being built around it. To support the increased traffic, developers have installed a brand-new signalized intersection, signaling just how big this rollout really is.
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Will the Old Costco Shut Down?
One major question floating around social media: what’s happening to the East Gwillimbury Costco just north of Newmarket?
There’s been chatter for years about that location being converted into a Costco Business Centre. And while many assumed the opening of the new Newmarket location would trigger that change, Costco shut down the rumors—for now.
When asked directly on Instagram, Costco Canada responded, saying:
“Just wanted to let you know the old Costco warehouse hasn’t closed down — still up and running!”
But don’t get too comfortable. Local retail watchers believe the shift is only a matter of time.
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source;official costco canada
Why This Opening Matters
• Convenience: The new location will reduce pressure on East Gwillimbury, Richmond Hill, and Aurora traffic.
• Retail Growth: Newmarket is already booming—this warehouse just accelerates that.
• Local Impact: From traffic changes to hiring waves, the ripple effect is already being felt in surrounding neighborhoods.
If you’re one of the thousands who shop Costco regularly, get ready. This new warehouse isn’t just bigger—it’s better placed, better built, and likely to become a central retail hub for the entire region.
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Official Confirmation
Costco confirmed the Newmarket location on its website under “New Locations Coming Soon”, listing “E Newmarket, ON – August 2025.”
The new address is directly south of the existing shopping plaza at 37 Harry Walker Parkway South, and it’s expected to handle high-volume traffic from Day One.
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Bottom Line
A new Costco means new options, less crowding, and—let’s be honest—a better parking situation. Whether you’re there for gas, groceries, or bulk buys you didn’t plan to make, August 20 is now a key date on the local retail calendar.
And if you’re still wondering what happens to the East Gwillimbury spot… keep watching. Something tells us that chapter isn’t closed yet.
