91 x 91 Hot Tub Cover — Size, Fit and 27 Spas That Take It

A hot tub measuring 91" × 91" takes the AIRCAP 1™ Large, which fits square spas 89–91". That is the whole answer — but measure your own spa before ordering rather than trusting the size of the cover you are replacing, because cabinets vary between model years and a cover bought to the wrong number is the most common ordering mistake there is.

Measure straight across the top of the cabinet, edge to edge, both ways. If the two numbers differ, use the larger one. If you land between two sizes, round up: an oversized cover overhangs by a fraction, which is how a spa cover is meant to sit, while an undersized one will not seal along the edges.

Which hot tubs are 91" × 91"?

27 of the 362 models in our Spa Fitter measure 91" × 91", across 7 brands. If yours is on this list, the size question is settled — click through for its own page.

Brand	Models measuring 91" × 91"
Arctic Spas	Grizzly, Orca
Artesian Spas	Elite Dove Canyon, Elite Piper Glen, Island Spas Grand Bahama, Island Spas Grand Cayman, South Seas 840BE, South Seas 840LE, South Seas 850B, South Seas 850L, South Seas 853DL, South Seas 860B, South Seas 860L
Bullfrog Spas	M7
Jacuzzi	J375, J385
Superior Wellness	Aqua Solus Cascade, Aqua Solus Serenity, Aqua Solus Solstice, Platinum Palermo, Platinum Portofino
Vita Spa	Luxe, Sensation
Wellis Spas	Lugano, Mont Blanc, Monte Rosa, Vienna

What if my spa is not exactly 91"?

The Large covers everything from 89–91" across, so you do not need to hit 91" exactly. Anything in that band takes the same cover. Outside it, the AIRCAP 1™ comes in six sizes spanning 77" to 94" — the two-measurement guide will place you, or you can look your model up directly in the Spa Fitter.

One limit worth stating plainly: these are covers for square spas. If your cabinet is round, octagonal or a rectangle, no size here will fit it, and the alternatives guide covers what will.

Other measurements we list: 78" × 78" · 80" × 80" · 84" × 84" · 89" × 89" · 92" × 92" · 93" × 93" · 94" × 94". Each page works the same way — every spa at that size, and the cover it takes.

What a 91" × 91" cover costs

The AIRCAP 1™ Large is $1,195 — the same price as every other size, including the pump, three Ziptech™ skirt depths and tie-down straps, with free shipping to all 50 states. There is no size surcharge, which is unusual in this category: most makers price a cover by its square footage, so a bigger spa costs more. For how that compares with foam and the other constructions, see what a hot tub cover costs.

It weighs 35–40 lb and, with no foam core to absorb water, never gains weight — the one number a foam cover cannot promise.

Frequently asked questions

What size cover fits a 91" x 91" hot tub?

A 91 inch square hot tub takes the AIRCAP 1 Large, which fits square spas 89 to 91 inches across. Measure straight across the top of your cabinet both ways and use the larger number; if it falls between two sizes, round up.

Which hot tubs are 91" x 91"?

27 models in our Spa Fitter measure 91 by 91 inches, across 7 brands including Arctic Spas, Artesian Spas, Bullfrog Spas and others. Each one has its own page listing the cover size it takes.

Does a 91 inch cover have to be exactly 91 inches?

No. The AIRCAP 1 Large fits any square spa from 89 to 91 inches across, so anything in that band takes the same cover. Only the larger of your two measurements matters.

How much does a 91" x 91" hot tub cover cost?

The AIRCAP 1 is $1,195 in every size, including the pump, three Ziptech skirt depths and tie-down straps, with free shipping to all 50 states. There is no size surcharge, so a 91 inch cover costs the same as the smallest one we make.