Labor Day Sale On California King Firm Mattresses

Shop the Labor Day On California King Firm Mattresses to explore a range of options designed for spacious sleep setups and a firmer feel. Compare available California king mattresses, find the right fit for your bedroom and budget, and save during this limited-time .

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Beautyrest BR800 Greenwood 10.5" Firm Mattress

3404

Starting at

$569⁹⁹

$1299⁹⁹

$730 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Bed Partner
Toss and Turn
Temperature
Pain

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's Rest Firm 2.0 Innerspring Mattress

7001

Starting at

$449⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Beautyrest BR800 11.25" Firm Mattress

2233

Starting at

$1299⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Stearns & Foster Estate 14.5" Firm Mattress

1809

Starting at

$2799⁰⁰

$3099⁰⁰

$300 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Allergies
Toss and Turn

Receive $300 Instant Gift⁴ with purchase.

Serta Perfect Sleeper Nurture Night 12" Firm Mattress

1186

Starting at

$999⁰⁰

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Nectar Classic 12" Firm Memory Foam Mattress

231

Starting at

$899⁰⁰

$1399⁰⁰

$500 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Tempur-Pedic TEMPUR-ProAdapt 2.0 12" Firm Mattress

4992

Starting at

$3799⁰⁰

$4199⁰⁰

$400 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Allergies
Bed Partner
Toss and Turn
Temperature

Receive $300 Instant Gift⁴ with purchase + Calm app 3-month free trial

Beautyrest Black Series Three 15" Firm Mattress

2224

Starting at

$4199⁰⁰

$4799⁰⁰

$600 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Purple RestorePlus 13" Firm Hybrid Mattress

1667

Starting at

$3600⁰⁰

$4399⁰⁰

$799 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Allergies
Bed Partner
Toss and Turn
Temperature

Tempur-Pedic TEMPUR-LuxeAdapt 2.0 13" Firm Mattress

1449

Starting at

$5099⁰⁰

$5599⁰⁰

$500 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Temperature
Allergies
Bed Partner
Toss and Turn

Receive $300 Instant Gift⁴ with purchase + Calm app 3-month free trial

Serta Perfect Sleeper Oasis Sleep 14.5" Firm Pillow Top Mattress

1178

Starting at

$1399⁰⁰

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's By Sealy Slumber Firm Mattress

705

Starting at

$1699⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Bed Partner
Toss and Turn
Pain
Temperature

Serta Perfect Sleeper Pacific Peace 12" Hybrid Firm Mattress

242

Starting at

$1399⁰⁰

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's By Sealy Memory Foam Firm Mattress

3213

Starting at

$779⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Toss and Turn

Stearns & Foster Estate 15" Firm Euro Pillow Top Mattress

2761

Starting at

$2999⁰⁰

$3299⁰⁰

$300 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Allergies
Toss and Turn

Receive $300 Instant Gift⁴ with purchase.

Beautyrest BR800 Greenwood 11.25" Firm Mattress

1695

Starting at

$619⁹⁹

$1299⁹⁹

$680 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Bed Partner
Toss and Turn
Temperature
Pain

FREE ADJUSTABLE BASE ³ with code ELEVATE

A Labor Day is a smart time to shop for a California King firm mattress and create a spacious, supportive sleep setup. Designed for couples, families with pets or anyone who enjoys extra room to stretch out, a California King mattress offers generous sleeping space from head to toe. A firm California King mattress can provide a stable, supportive feel that helps promote comfortable spinal alignment, especially for sleepers who prefer less sink and more lift. Explore a range of California King firm mattresses at Mattress Firm, including options with cooling covers, pressure-relieving comfort layers, breathable materials and responsive support to help you find the right match for your sleep style. Finding the best California King firm mattress starts with comparing mattress materials, support systems and comfort preferences alongside Labor Day savings. Innerspring, hybrid and foam mattresses can each deliver a firm feel in different ways, so consider whether you want responsive coil support, contouring comfort or a balanced combination of both. Sleep Experts® can help you compare California King mattress options, answer questions about firmness and recommend a mattress that fits your needs and budget. Shop the Labor Day mattress at Mattress Firm for ways to upgrade your bedroom with a California King firm mattress and enjoy more comfortable zzz's for less.

What makes a firm mattress feel firm? + -

A firm mattress typically uses supportive foams, coils or both to create a more solid sleep surface with less sink.

What materials are commonly used in firm mattresses? + -

Firm mattresses may include innerspring coils, high-density foam, memory foam, latex or layered combinations of these materials.

Are firm mattresses available with different comfort layers? + -

Yes. A firm mattress can have a cushioned top layer made with materials such as quilted fabric, foam or latex while maintaining a firm feel underneath.

What type of bed frame works with a firm mattress? + -

Firm mattresses are generally compatible with platform beds, slatted frames, adjustable bases and traditional foundations when the support system meets the mattress manufacturer's requirements.

How can I care for a firm mattress? + -

Use a breathable mattress protector, keep the sleep surface clean and follow the manufacturer's care recommendations for rotation and cleaning.