Labor Day Sale On Firm King Size Mattresses

Shop the Labor Day On Firm King Size Mattresses at Mattress Firm to explore comfortable sleep solutions at seasonal savings. Find a king size mattress that fits your bedroom, preferences and budget, with options for shoppers seeking a firm feel. Shop online or Find A Store to get started.

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Sealy Essentials Sudley 8.5" Firm Mattress

989

Starting at

$500⁰⁰

$999⁹⁹

$500 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Temperature
Bed Partner
Toss and Turn

Beautyrest PressureSmart 2.0 Firm 11" Mattress

Starting at

$1100⁰⁰

$2199⁹⁹

$1100 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Temperature
Bed Partner
Pain
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's Basic Memory Foam Firm Mattress

3239

Starting at

$299⁷⁷

$999⁹⁹

$700 OFF

Firm Comfort, best for

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

Serta Perfect Sleeper Nurture Night 12" Firm Mattress

1194

Starting at

$859⁰⁰

$999⁰⁰

$140 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's Basic Innerspring Firm Mattress

8697

Starting at

$249⁹⁹

Firm Comfort, best for

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

Sleepy's Rest Firm 2.0 Innerspring Mattress

7012

Starting at

$449⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Beautyrest Black Series Three 15" Firm Mattress

2247

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.

Tempur-Pedic TEMPUR-LuxeAdapt 2.0 13" Firm Mattress

1458

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

Sleepy's Basic Foam Mattress

1418

Starting at

$259⁹⁹

$649⁹⁹

$390 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Temperature
Bed Partner
Toss and Turn

Beautyrest BR800 11.25" Firm Mattress

2242

Starting at

$619⁹⁹

$1299⁹⁹

$680 OFF

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

1829

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.

Nectar Classic 12" Firm Memory Foam Mattress

233

Starting at

$899⁰⁰

$1399⁰⁰

$500 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Sealy Essentials Spruce 5.5" Firm Mattress

1372

Starting at

$549⁹⁹

$949⁹⁹

$400 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Temperature
Bed Partner
Toss and Turn

Tempur-Pedic TEMPUR-ProAdapt 2.0 12" Firm Mattress

5043

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

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

Serta Perfect Sleeper Oasis Sleep 14.5" Firm Pillow Top Mattress

1187

Starting at

$1139⁰⁰

$1399⁰⁰

$260 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

A Labor Day is a smart time to shop for a firm king size mattress that gives you the spacious comfort and supportive feel you need for better zzz’s. Firm mattresses can help create a stable sleep surface for people who prefer a more supportive feel, sleep on their back or stomach, or share a bed with a partner and want dependable support across the mattress. During the Labor Day mattress at Mattress Firm, explore firm king mattresses from trusted brands in a variety of materials, including innerspring, foam and hybrid designs. With a king mattress, you can enjoy more room to stretch out while choosing the firmness, cooling features and comfort technologies that fit your sleep style. Finding the right firm king size mattress starts with considering your preferred sleeping position, pressure relief needs and overall comfort preferences. Look for supportive construction, durable materials and features designed to help promote comfortable sleep night after night. Mattress Firm makes it easier to compare king size mattresses during the Labor Day , with options for a range of budgets and sleep needs. Shop online or visit a Mattress Firm store to speak with Sleep Experts® who can help you find a firm king mattress that supports your body and complements your bedroom. Pair your new mattress with a king size bed frame, adjustable base or comfortable bedding to create a sleep space that helps you live well.

What is a firm mattress? + -

A firm mattress has a more supportive, solid feel with less cushioning when you lie down. Firmness can vary by mattress design and materials, so consider how the comfort layers and support system contribute to the overall feel.

Who may prefer a firm mattress? + -

Firm mattresses may appeal to sleepers who enjoy a solid, supportive feel and less sinkage. Personal comfort preferences, sleep position and body type can all influence which firmness feels right.

What materials are commonly used in firm mattresses? + -

Firm mattresses may include innersprings, foam, memory foam or hybrid constructions. Each material can contribute to the mattress’s feel, support and surface comfort.

How can I compare firm mattresses during a Labor Day ? + -

Compare the mattress construction, firmness description, comfort layers and support system. Reading product details and trying mattresses in a store can help you understand how different firm feels compare.

What bedding works well with a firm mattress? + -

Choose bedding based on the feel you prefer. A mattress protector helps keep the surface clean, while sheets, pillows and a comforter can add softness and complete your sleep setup.