It’s Happening: Costco’s Giant Newmarket Location Set to Change Everything on August 20

If you thought Newmarket was already packed with big-box stores and traffic, brace yourself — because Costco is coming in hotter than ever.

After years of speculation, Costco Canada has officially confirmed that its massive new warehouse at Harry Walker Parkway South will open its doors on August 20. The size? Over 15,000 square metres. The setup? A full-blown retail fortress, complete with a gas bar, hundreds of parking spots, and a newly built signalized intersection to manage the flood of cars that are about to roll in.

Why This Is a Big Deal

This isn’t just another store. It’s a massive retail shift that could transform shopping patterns across Newmarket, East Gwillimbury, and beyond.

Shoppers have been asking the same question for months:
What happens to the East Gwillimbury Costco on Yonge Street?

That location was once rumored to become a Costco Business Centre, and with the new Newmarket giant opening just minutes away, the speculation has reignited. But as of now, Costco Canada has responded publicly:

“The old Costco warehouse hasn’t closed down — still up and running.”

Translation: It’s staying open. For now.

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Source: Official Costco Canada

But Here’s the Twist…

Insiders and local threads suggest the Yonge Street location could quietly convert later this year, just as business traffic increases along Highway 11. If that happens, Newmarket residents will be caught in the crossfire of two very different Costco experiences — one for families, one for business stockpilers.

And with this new location sitting just steps away from major commuter arteries and shopping plazas, expect traffic, noise, and retail wars to become the new normal.

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What the New Costco Offers:
• Over 15,000 m² of warehouse space
• A massive new parking lot for weekend mobs
• An on-site gas bar to compete with local stations
• Attached retail units — hinting at more big brands arriving
• A fully redesigned intersection for smoother traffic flow

This isn’t just a warehouse. It’s a statement — and it’s going to pull thousands of shoppers from all directions, especially with holiday season approaching.

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The Bigger Picture

Costco isn’t just opening a store. It’s planting a flag. And the retail impact could ripple into surrounding stores, real estate prices, traffic control projects, and even local hiring.

Whether you’re a local business owner or just someone trying to grab milk without sitting in 40 minutes of bumper-to-bumper—this matters.

So mark your calendar. Because come August 20, Costco is coming — and it’s bringing more than just bulk paper towels.