90 x 90 Hot Tub Cover — Size, Fit and 33 Spas That Take It

A hot tub measuring 90" × 90" 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 90" × 90"?

30 of the 1093 models in our Spa Fitter measure 90" × 90", across 9 brands, and 3 more round up to it (listed below). If yours is on this list, the size question is settled — click through for its own page.

Brand	Models measuring 90" × 90"
Aahs Spas	4000, 5000, 6000
Alps Spas	Everest (Tigra XLS), K2, Olympus (Olympus XLS), Q-90
Canadian Spa Company	Niagara Falls, Superior (Great Lakes)
Coast Spas	NorthWind 8B / 8C, NorthWind 8L, Silhouette SC 854 / SL 854
Hydropool Hot Tubs	Self-Cleaning 728 Platinum (720 Platinum), Self-Cleaning 779 Platinum (770 Platinum), Self-Cleaning 799 Platinum
Integrity Spas	Hawaii, Molokai, Montego Bay, Oahu, Rum Cay, Tahitian
Jacuzzi	J-275, J-280
Marquis Spas	Epic, Euphoria, Woodstock, Woodstock Elite, e-Series 660
Passion Spas	Bright, Sunny

Also rounds up to 90" × 90"

3 more models are not printed as an exact 90" square: one or both sides fall a fraction short. The rule is to round up, so they take the same Large.

Brand	Rounds up to 90" × 90"
Passion Spas	Reflect (89.8" x 89.8", 0.2" short), Resettle (89.8" x 89.8", 0.2" short), Retreat (89.8" x 89.8", 0.2" short)

That makes 90" the 14th most common of the 18 square footprints in the Spa Fitter (33 of 1093, 3.0%); the most common is 84" × 84" with 257. Next door, 89" × 89" lists 46 (plus 1 that rounds up) and 91" × 91" lists 112 (plus 5 that round up). Integrity Spas builds more at this size than anyone else — 6 of the 33; its other 4 square models sit at 79" × 79", 86" × 86", 91" × 91".

What if my spa is not exactly 90"?

90" (228.6 cm) sits inside the Large band — 89", 90" and 91" all take the same cover, so an exact 90" has room on both sides.

The Large covers everything from 89–91" across, so you do not need to hit 90" exactly. Outside that band, 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.

Nearby measurements: 89" × 89" · 91" × 91". Every size from 77" to 94" has its own page, listed on the Spa Fitter.

What a 90" × 90" 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 90" x 90" hot tub?

A 90 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 90" x 90"?

30 models in our Spa Fitter measure 90 by 90 inches across 9 brands (Aahs Spas, Alps Spas, Canadian Spa Company and 6 others), and 3 more round up to it. Each one has its own page listing the cover size it takes.

Does a 90 inch cover have to be exactly 90 inches?

No. The AIRCAP 1 Large fits any square spa from 89 to 91 inches across, so 90 sits inside the band with room on both sides. Only the larger of your two measurements matters.

How much does a 90" x 90" 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 90 inch cover costs the same as the smallest one we make.