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California King Size Mattresses

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Blackstone 14" Cal-King Memory Foam Mattress

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$629.99
Blackstone 14" Cal-King Memory Foam Mattress
Rated 4.3 out of 5 stars based on 599 reviews.
(599)
Blackstone 12" Cal-King Memory Foam Mattress

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$549.99
Blackstone 12" Cal-King Memory Foam Mattress
Rated 4.5 out of 5 stars based on 8242 reviews.
(8242)
Thomasville Precision Gel 14" Memory Foam Mattress

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Starting at
$2,099.99
Thomasville Precision Gel 14" Memory Foam Mattress
Rated 3.8 out of 5 stars based on 59 reviews.
(59)
Box Spring Available
Sealy Response Premium Ridge Crest Mattress Firm or Plush

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Starting at
$649.99
Sealy Response Premium Ridge Crest Mattress Firm or Plush
Rated 4.1 out of 5 stars based on 1413 reviews.
(1413)
Box Spring Available
Sealy Response Performance Gray Cove Cal King Mattress Plush or Firm

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Starting at
$699.99
Sealy Response Performance Gray Cove Cal King Mattress Plush or Firm
Rated 4.3 out of 5 stars based on 3634 reviews.
(3634)
Comfort Tech Elite Aurora 12" Medium Cal-King Mattress

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$649.99
Comfort Tech Elite Aurora 12" Medium Cal-King Mattress
Rated 4.4 out of 5 stars based on 1261 reviews.
(1261)
Thomasville Precision Gel 14" Memory Foam Mattress and Foundation Set

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Starting at
$2,499.99
Thomasville Precision Gel 14" Memory Foam Mattress and Foundation Set
Rated 3.8 out of 5 stars based on 59 reviews.
(59)
Sleep Science 12” iFlip Sonoma Cal-King Dual Comfort Memory Foam Mattress

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$899.99
Sleep Science 12” iFlip Sonoma Cal-King Dual Comfort Memory Foam Mattress
Rated 4.3 out of 5 stars based on 774 reviews.
(774)
Thomasville Precision Gel 14" Memory Foam Split Cal-King Mattress with Adjustable Base

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$4,999.99
Thomasville Precision Gel 14" Memory Foam Split Cal-King Mattress with Adjustable Base
Rated 3.8 out of 5 stars based on 59 reviews.
(59)
Sleep Science Split Cal King Adjustable Base

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$1,599.99
Sleep Science Split Cal King Adjustable Base
Rated 4.4 out of 5 stars based on 24 reviews.
(24)
Molecule 2 AirTEC 12" Cal King Mattress with Microban 

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$1,299.99
Molecule 2 AirTEC 12" Cal King Mattress with Microban 
Rated 4.3 out of 5 stars based on 378 reviews.
(378)
Novaform 14" Serafina Pearl Cool Comfort Firm Gel Memory Foam Cal King Mattress

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$899.99
Novaform 14" Serafina Pearl Cool Comfort Firm Gel Memory Foam Cal King Mattress
Rated 4.1 out of 5 stars based on 2413 reviews.
(2413)
Novaform 14" Serafina Pearl Cool Comfort Plush Gel Memory Foam Cal King Mattress

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$899.99
Novaform 14" Serafina Pearl Cool Comfort Plush Gel Memory Foam Cal King Mattress
Rated 4 out of 5 stars based on 1330 reviews.
(1330)
Novaform 14" Comfort Grande Plus Memory Foam Mattress

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Starting at
$399.99
Novaform 14" Comfort Grande Plus Memory Foam Mattress
Rated 4.3 out of 5 stars based on 195 reviews.
(195)
Beautyrest 12" Silver Micro Diamond Memory Foam Mattress

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Starting at
$699.99
Beautyrest 12" Silver Micro Diamond Memory Foam Mattress
Rated 4.3 out of 5 stars based on 94 reviews.
(94)
Novaform 14" Serafina Pearl Cool Comfort Medium Gel Memory Foam Cal King Mattress

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$899.99
Novaform 14" Serafina Pearl Cool Comfort Medium Gel Memory Foam Cal King Mattress
Rated 4.3 out of 5 stars based on 2591 reviews.
(2591)
Thomasville Catalina 10.5" Hybrid Gel Memory Foam Mattress with Adjustable Base

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$1,999.99
Thomasville Catalina 10.5" Hybrid Gel Memory Foam Mattress with Adjustable Base
Rated 0 out of 5 stars based on 0 reviews.
(0)
Comfort Tech Intuition 12" Memory Foam Cal King Mattress

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$649.99
Comfort Tech Intuition 12" Memory Foam Cal King Mattress
Rated 4.6 out of 5 stars based on 12 reviews.
(12)
Blackstone Deluxe 12" Hybrid iCoil Spring and Memory Foam Mattress

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Starting at
$329.99
Blackstone Deluxe 12" Hybrid iCoil Spring and Memory Foam Mattress
Rated 4.3 out of 5 stars based on 661 reviews.
(661)
Sleep Science 14" Copper Infused Cal King Memory Foam Mattress - Firm

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$899.99
Sleep Science 14" Copper Infused Cal King Memory Foam Mattress - Firm
Rated 4.3 out of 5 stars based on 595 reviews.
(595)
Sleep Science Black Diamond 11" Cal King Memory Foam Mattress

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$1,149.99
Sleep Science Black Diamond 11" Cal King Memory Foam Mattress
Rated 4.2 out of 5 stars based on 377 reviews.
(377)
Sleep Science 10" Cal-King Memory Foam Mattress

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$699.99
Sleep Science 10" Cal-King Memory Foam Mattress
Rated 4.1 out of 5 stars based on 457 reviews.
(457)
Sleep Science 9" Natural Latex Cal-King Mattress, Medium-Firm

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$2,999.99
Sleep Science 9" Natural Latex Cal-King Mattress, Medium-Firm
Rated 4.2 out of 5 stars based on 285 reviews.
(285)
Sleep Science Carina 11" Cal King Gel Memory Foam Mattress

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$1,099.99
Sleep Science Carina 11" Cal King Gel Memory Foam Mattress
Rated 4.2 out of 5 stars based on 328 reviews.
(328)
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King Mattresses

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.