Square or Octagon? How to Pick the Right Hot Tub Cover for Your Spa

Finding the Right Fit Matters

When it comes to protecting your hot tub, the right cover makes a world of difference. Whether your spa is an unusual shape or a standard one, a quality cover extends its life and boosts energy efficiency. Choosing between an octagon hot tub cover and a square hot tub cover may seem simple, but the real answer lies in how well the cover fits, how it performs in your climate, and how long it lasts.

At Northern Hot Tub Covers, we’ve built more than 25,000 custom spa covers right here in Canada. From indoor setups in condos to backyard spas in snowy regions, we know what works. And we build your cover based on your specific needs—not a one-size-fits-all solution.

Octagon or Square? Start with Measurements

Before you place an order, accurate measurement is key. Many people make the mistake of ordering based on estimates. A hot tub cover that’s too small lets heat escape. One that’s too big is hard to manage and can wear unevenly.

If you have an octagon-shaped spa, don’t settle for an oversized round or square cover. An octagonal hot tub cover fits snugly around the unique angles of your tub, protecting every inch from weather and debris.

On the other hand, a square hot tub cover is ideal for most classic four-sided spas. Northern Hot Tub Covers has a comprehensive database of dimensions for all major brands, making it easy for you to get a perfect fit—without the guesswork.

Quality Materials Built for Canadian Weather

Not all covers are created equal. Harsh winters demand high-performance materials. All our covers—from Signature to Ultimate II—are built with Canadian seasons in mind.

For lighter use, the Signature model with a 4” to 2” taper and 1.5 lb foam does the job indoors or in mild weather. For heavier snow regions, the Ultimate II is unbeatable. Its 6” to 4” taper and denser foam give you peace of mind when storms roll in.

Each octagon or square hot tub cover we make includes:

• Marine-grade 28 oz vinyl
• Aluminum C-channel reinforcements
• Heavy-duty zippers and handles
• Sealed foam cores to prevent water absorption

You won’t find offshore shortcuts here. Our products are proudly Canadian, built by workers who understand the climate.

Energy Savings That Add Up

A poorly fitting or worn-out cover leaks heat and increases your energy bill. A good cover traps warmth inside and reduces how hard your spa’s heater has to work. That’s why our custom covers are not just about looks—they’re functional investments.

If you use your spa year-round, upgrading to a thicker cover saves you money long-term. Even our entry-level models are engineered for thermal efficiency, but if you’re in a region with heavy snowfall or sub-zero temps, investing in a thicker foam core makes sense.

Every square hot tub cover or octagon hot tub cover can be further customized with add-on insulation packages. This lets you balance price and performance based on how often you use your spa and where you live.

Order with Confidence

Northern Hot Tub Covers stands behind every cover with a Best Price Guarantee and an industry-leading 5-Year No-Nonsense Warranty. We make sure your replacement cover is built to fit—not just close enough.

Not sure what to order? Our customer service team is ready to help you choose the right model, shape, and thickness. We also offer convenient add-ons like cover lifters, which make daily spa use easier and extend your cover’s life.

The Bottom Line

Choosing the right hot tub cover doesn’t have to be complicated. At Northern Hot Tub Covers, we simplify the process with custom-built covers made in Canada for Canadian conditions. Whether you need a reliable square hot tub cover or a precisely cut octagon hot tub cover, our team guarantees a perfect fit, long-lasting materials, and top-tier energy efficiency. With four quality grades to choose from, expert support, and the best warranty in the business, protecting your hot tub has never been easier—or smarter.

Ready for a perfect fit? Order your spa cover today at NorthernHotTubCovers.com and enjoy comfort, quality, and peace of mind all year round.