Skip to Main Content
Save on Select Vacuums and Floorcare from Dyson, Roborock, Bissell and More
Costco US homepage
Costco US homepage
Type and press the down arrow to browse search suggestions
Skip to Results

Filter Results

After selecting this filter, page will reload
New Search Results Available

California King Size Mattresses

Showing 1-24 of 26

PurpleRenew 11" Gel Grid Mattress
$1,399.99 - $1,699.99

Qualifies for Costco Direct Savings. See Product Details.

PurpleRenew 11" Gel Grid Mattress

Sealy Posturepedic Pro Lincoln Heights 14" Firm or Plush Mattress
$869.99 - $1,199.99

Qualifies for Costco Direct Savings. See Product Details.

Sealy Posturepedic Pro Lincoln Heights 14" Firm or Plush Mattress

Kirkland Signature by Stearns & Foster 14.5" Lakeridge Mattress
$999.99 - $1,199.99

Qualifies for Costco Direct Savings. See Product Details.

Kirkland Signature by Stearns & Foster 14.5" Lakeridge Mattress

Novaform 14” ComfortGrande Advanced Gel Memory Foam Mattress
$319.99 - $579.99
After $80 - $120 OFF

Qualifies for Costco Direct Savings. See Product Details.

Novaform 14” ComfortGrande Advanced Gel Memory Foam Mattress

Beautyrest 12" Silver BRS900 Medium-Firm Mattress
$549.99 - $649.99

Qualifies for Costco Direct Savings. See Product Details.

Beautyrest 12" Silver BRS900 Medium-Firm Mattress

Sealy Posturepedic Plus Prosser Hills 12" Firm or 13.5" Plush Mattress
$549.99 - $849.99
After $150 - $200 OFF

Qualifies for Costco Direct Savings. See Product Details.

Sealy Posturepedic Plus Prosser Hills 12" Firm or 13.5" Plush Mattress

Casper Cooling Select 12" Memory Foam Mattress
$549.99 - $849.99

Qualifies for Costco Direct Savings. See Product Details.

Casper Cooling Select 12" Memory Foam Mattress

Sealy Posturepedic Pro Highland Manor 13" Medium Mattress
$599.99 - $849.99
After $100 - $150 OFF

Qualifies for Costco Direct Savings. See Product Details.

Sealy Posturepedic Pro Highland Manor 13" Medium Mattress

Beautyrest 14.5" Silver Hybrid DualCool Plush Mattress
$849.99 - $1,299.99

Beautyrest 14.5" Silver Hybrid DualCool Plush Mattress

Casper Cooling Select 12" Hybrid Medium Firm Mattress
$749.99 - $999.99

Qualifies for Costco Direct Savings. See Product Details.

Casper Cooling Select 12" Hybrid Medium Firm Mattress

Sleep Science 14" Copper Infused Firm Memory Foam Mattress
$649.99 - $799.99

Sleep Science 14" Copper Infused Firm Memory Foam Mattress

Tempur-Pedic Supreme 11.5” Medium or Firm Mattress with Ergo Adjustable Base
$2,699.99 - $4,499.99

Tempur-Pedic Supreme 11.5” Medium or Firm Mattress with Ergo Adjustable Base

Leesa Legend 12" Hybrid Mattress Medium Plush
$1,049.99 - $1,249.99

Leesa Legend 12" Hybrid Mattress Medium Plush

Sleep Science Q-Series Adjustable Base
$599.99 - $999.99

Sleep Science Q-Series Adjustable Base

Sleep Science 12" iFlip Sonoma Dual Comfort Memory Foam Mattress
$679.99 - $799.99

Sleep Science 12" iFlip Sonoma Dual Comfort Memory Foam Mattress

Sleep Science 13" Bamboo Cool Firm Mattress
$649.99 - $799.99

Sleep Science 13" Bamboo Cool Firm Mattress

Novaform SoFresh Plus 10” Responsive Foam Mattress
$249.99 - $429.99
After $80 - $120 OFF

Novaform SoFresh Plus 10” Responsive Foam Mattress

Tempur-Pedic Supreme 11.5” Medium Hybrid Mattress with Ergo Adjustable Base
$2,699.99 - $4,499.99

Tempur-Pedic Supreme 11.5” Medium Hybrid Mattress with Ergo Adjustable Base

Sleep Science 13" Bamboo Cool Mattress with Q Plus Adjustable Base
$1,699.99 - $2,599.99

Sleep Science 13" Bamboo Cool Mattress with Q Plus Adjustable Base

Sleep Science 14" Copper Infused Firm Memory Foam Mattress with Adjustable Q-Plus Base
$1,699.99 - $2,699.99

Sleep Science 14" Copper Infused Firm Memory Foam Mattress with Adjustable Q-Plus Base

Simply Modern 12" Hybrid Gel Memory Foam Mattress
$479.99 - $579.99

Simply Modern 12" Hybrid Gel Memory Foam Mattress

Sleep Science Hudson 10” Mattress with Upholstered Bed Frame
$899.99 - $999.99

Sleep Science Hudson 10” Mattress with Upholstered Bed Frame

Sleep Science 12" iFlip Sonoma Memory Foam Mattress with Adjustable Power Base
$1,799.99 - $2,799.99

Sleep Science 12" iFlip Sonoma Memory Foam Mattress with Adjustable Power Base

Ghostbed Luxe 13" Memory Foam Mattress
$1,199.99 - $1,499.99

Ghostbed Luxe 13" Memory Foam Mattress

Your choice of mattress will set the tone for your entire day, so let’s make it a good one! For a roomy experience, you might consider one of the traditional king mattresses. But if what you want is an absolutely luxurious sleeping option, the spacious California king mattress is the one for you. Measuring in at an impressive minimum standard of 72-inches wide by 84-inches long, the California king mattress is the lengthiest and most substantial of them all. Shop Costco’s Cal king mattress selection now, and get started on a great night’s sleep.

Feedback Will open a new window