Find comfortable Split California King Box Springs & Bed Bases and the bedroom accessories you need at great low prices at Mattress Firm.

Shop for  Split California KingBox Springs & Bed Bases | Mattress Firm

Basic Box Spring Foundation

Perfect Sleeper Box Spring Foundation

PressureSmart 2.0 Box Spring Foundation

California King(One Piece Base)

King (One Piece Base)

Split California King

Full

Queen

Twin

Twin XL

Signature Adjustable Base

SMB SX Box Spring Foundation

Ease™ Adjustable Base

900 Adjustable Base

Universal Box Spring Foundation

TEMPUR-Ergo® 3.0 Adjustable Base

Deluxe Adjustable Base

California King

TwinXL

Basic Adjustable Base

Bunkie Board

Charcoal Box Spring Foundation

Ultra Low Profile Foundation

Size

King

Split Queen

One Size

Full XL

Twin/Full

Cal K 1 Pc

King 1 PC

One Piece California King

One Piece California King Foot

One Piece California King Head

One Piece King Foot

One Piece King Head

Split Top King

Splt TP CK

Splt TP QN

Special Offers

New Arrivals

Mattress Firm Exclusive

Sale

Clearance

Brand

Tempur-Pedic

Sleepy's

Mattress Firm

Beautyrest

Kingsdown

Sealy

Serta

Stearns & Foster

Chattam & Wells

Price

1000.0

2000.0

3000.0

4000.0

5000.0

Type

Box Springs

Adjustable Bases

Bunkie Boards

Price - (Low - High)

Price - (High - Low)

Customer Rating

You will receive a call, text and email the evening prior to your delivery date with a two-hour delivery window.

Drop-off to your front door, side door or garage. Signature Required.

<h4>This item is backordered 6+ weeks.</h4>

In-home setup and removal of your old mattresses.

In-home setup and removal of your old mattress(s). Set up includes up to&nbsp;3 mattress sets and&nbsp;adjustable bases.

The Suggested Equal Monthly Payment shown above may be greater than the required minimum monthly payment that will be on your billing statement when you use the 6 month promotional financing offer.&nbsp;This estimated payment:<ul><li>Equals the promotional purchase amount divided by 6 rounded to the next highest whole dollar.</li><li>Would pay off the promotional purchase amount within 6 months, but only if there are no other balances on your account at any time during the 6 month promotional period and you make your payments on time. Your total payments will equal the amount of the promotional purchase amount.</li></ul>&nbsp;If the promotional purchase amount is not paid in full within 6 months, interest will be charged to your account from the purchase date and your total payments will be greater than the amount of the promotional purchase amount.&nbsp;IMPORTANT: The information about the Suggested Equal Monthly Payment shown assumes the following promotional financing offer is applied to the purchase:&nbsp;No Interest if Paid in Full Within 6 Months*** 
On purchases with your Mattress Firm Synchrony HOME Credit Card. Interest will be charged to your account from the purchase date if the promotional balance&nbsp;is not paid in full within 6&nbsp;months. Minimum monthly payments required.

The Suggested Equal Monthly Payment shown above may be greater than the required minimum monthly payment that will be on your billing statement when you use the 12 month promotional financing offer.&nbsp;This estimated payment:<ul><li>Equals the promotional purchase amount divided by 12 rounded to the next highest whole dollar.</li><li>Would pay off the promotional purchase amount within 12 months, but only if there are no other balances on your account at any time during the 12 month promotional period and you make your payments on time. Your total payments will equal the amount of the promotional purchase amount.</li></ul>&nbsp;If the promotional purchase amount is not paid in full within 12 months, interest will be charged to your account from the purchase date and your total payments will be greater than the amount of the promotional purchase amount.&nbsp;IMPORTANT: The information about the Suggested Equal Monthly Payment shown assumes the following promotional financing offer is applied to the purchase:&nbsp;No Interest if Paid in Full Within 12 Months*** 
On purchases with your Mattress Firm Synchrony HOME Credit Card. Interest will be charged to your account from the purchase date if the promotional balance is not paid in full within 12 months. Minimum monthly payments required.

The Suggested Equal Monthly Payment shown above may be greater than the required minimum monthly payment that will be on your billing statement when you use the 24 month promotional financing offer.&nbsp;This estimated payment:<ul><li>Equals the promotional purchase amount divided by 24 rounded to the next highest whole dollar.</li><li>Would pay off the promotional purchase amount within 24 months, but only if there are no other balances on your account at any time during the 24 month promotional period and you make your payments on time. Your total payments will equal the amount of the promotional purchase amount.</li></ul>&nbsp;If the promotional purchase amount is not paid in full within 24 months, interest will be charged to your account from the purchase date and your total payments will be greater than the amount of the promotional purchase amount.&nbsp;IMPORTANT: The information about the Suggested Equal Monthly Payment shown assumes the following promotional financing offer is applied to the purchase:&nbsp;No Interest if Paid in Full Within 24 Months*** 
On purchases&nbsp;with your Mattress Firm Synchrony HOME Credit Card. Interest will be charged to your account from the purchase date if the promotional balance is not paid in full within 24 months. Minimum monthly payments required.

The estimated monthly payments shown above equal:(1) a reduced amount for the first 3 months, then(2) the remaining amount financed divided by 33, rounded to the next highest whole dollar. It is only good with the financing offer shown. If you make these payments by the due date each month, you should pay off the promo balance within the promo period, if it is the only balance, you are paying off. If you have other balances on your account, this payment will be added to any other minimum monthly payments. &nbsp; 
&nbsp;IMPORTANT: The information about the Monthly Payment shown assumes the following promotional financing offer is applied to the amount financed:0% Interest for &nbsp;36&nbsp;Months* 
On purchases of $1499 or more with your Mattress Firm or Synchrony HOME credit card.&nbsp;36 monthly payments required - $1 for the first 3 months then 33 higher equal monthly payments. &nbsp;

The estimated monthly payment shown equals the purchase price divided by the number of months in the promo period. It is rounded to the next highest whole dollar. It is only good with the financing offer shown. If you make these payments by the due date each month, you should pay off this purchase within the promo period, if it is the only balance you are paying off. If you have other balances on your account, this payment will be added to any other minimum monthly payments.&nbsp;&nbsp;IMPORTANT: The information about the Equal Monthly Payment shown assumes the following promotional financing offer is applied to the purchase: 
&nbsp;0% Interest for 48&nbsp;Months** 
On purchases $1999 or more with your Mattress Firm Synchrony HOME Credit Card. 48 equal monthly payments required.

The estimated monthly payment shown equals the purchase price divided by the number of months in the promo period. It is rounded to the next highest whole dollar. It is only good with the financing offer shown. If you make these payments by the due date each month, you should pay off this purchase within the promo period, if it is the only balance you are paying off. If you have other balances on your account, this payment will be added to any other minimum monthly payments.&nbsp;&nbsp;IMPORTANT: The information about the Equal Monthly Payment shown assumes the following promotional financing offer is applied to the purchase:&nbsp;0% Interest for 60&nbsp;Months** 
On purchases $1999&nbsp;or more with your Mattress Firm Synchrony HOME Credit Card. 60&nbsp;equal monthly payments required.

The estimated monthly payment shown equals the purchase price divided by the number of months in the promo period. It is rounded to the next highest whole dollar. It is only good with the financing offer shown. If you make these payments by the due date each month, you should pay off this purchase within the promo period, if it is the only balance you are paying off. If you have other balances on your account, this payment will be added to any other minimum monthly payments.&nbsp;&nbsp;IMPORTANT: The information about the Equal Monthly Payment shown assumes the following promotional financing offer is applied to the purchase:&nbsp;0% Interest for 72&nbsp;Months** 
On purchases $2999&nbsp;or more with your Mattress Firm Synchrony HOME Credit Card. 72&nbsp;equal monthly payments required.

Night Owl Sale

Use code NIGHTOWL to save up to 25%&nbsp;with select&nbsp;purchases&nbsp;

After Hours Flash Sale 2

Flash Sale:&nbsp;Extra 20% off⁹&nbsp;with code SAVE20&nbsp;

After Hours Flash Sale 3

0% Financing

Don&#39;t miss&nbsp;0% interest* financing &amp; no credit purchase options

Cyber Monday

Cyber Monday Flash Sale:&nbsp;Extra 25% off⁹&nbsp;with code CYBER&nbsp;

Current Sale Banner

&nbsp;Once-A-Year Sale is here! Shop our best deals in-store &amp; online&nbsp;

Sleepys 50% Off

Ends today: Up to 50% off Sleepy&#39;s&nbsp;&nbsp;

Deal of the Day Thursday DDs

Deals of the day! End&nbsp;in&nbsp;

$50 Off Mattresses

Extra $50&nbsp;off select&nbsp;mattresses ends today&nbsp;

36 Hour Flash Sale

Flash Sale: Extra 20% off with code 36HOUR&nbsp;

Holiday Sale 3

Big Holiday&nbsp;Flash Sale: Extra 25% OFF9&nbsp;Promo Code: HOLIDAY&nbsp;

Holiday Sale 4

Holiday Sale 5

Holiday Sale 6

50% Off Ends Soon

Up to 50% off select mattresses ends today&nbsp;

72 Month Financing Limited Time

Better sleep made easy: 72-month&nbsp;financing available**

Unjunk Your Sleep Sale

Unjunk Your Sleep Sale: Extra 20% off9&nbsp;with code UNJUNK20&nbsp;

Unjunk 2

Last Minute Holiday

Save up to 50% on last-minute holiday deals!&nbsp;🎁

Cyber After Hours

Cyber After Hours: Extra 25% OFF9&nbsp;Promo Code: CYBER&nbsp;

Cyber After Hours 2

Big Thanks Flash Sale

The Big Thanks Flash Sale: Extra 25% off9&nbsp;with code THANKS&nbsp;

Black Friday Flash Sale

Use code FLASH to save up to 25%&nbsp;with qualifying purchase9&nbsp;

Black Friday Flash Sale 2

Prime Time After Hours

Prime Time After Hours Sale: Extra 25% off with code PRIMETIME

Prime Time After Hours 2

Prime Time After Hours 3

BFS Big Weekend Flash Sale

Big Weekend Flash Sale: Extra 25% off9&nbsp;with code&nbsp;FLASH&nbsp;

BFS Big Weekend Flash Sale 2

BFS Big Weekend Flash Sale 3

BFS Big Weekend Flash Sale 4

Big Weekend Flash Sale: Extra 25% off9&nbsp;with code&nbsp;HOLIDAY&nbsp;

SSE Long Weekend Savings

Get up to 50% off&nbsp;mattresses, bedding &amp; more&nbsp;

Extended Store Hours

Extended store hours this weekend only!

MLB20

Baseball is back. If your team wins take an extra 20% off.6 Only valid in-stores.&nbsp;

Big Game Flash Sale 

Big Game Flash Sale: Extra 20% off with code GAME20

72hr - Stacked DDs

72 Hour Sale: Save up to 60% off&nbsp;mattresses &amp; more&nbsp;

Holiday Flash Sale JFS

Holiday Flash Sale: Extra 25% OFF9&nbsp;Promo Code: HOLIDAY&nbsp;

JFS 1 - Stacked DDs

July 4th Sale: Up to 60% OFF&nbsp;select mattresses &amp; more!&nbsp;

JFS 2 - Stacked DDs

JFS 3 - Stacked DDs

JFS 4 - Stacked DDs

JFS 5 - Stacked DDs

LMHD 1 - Stacked DDs

Holiday Deals: Save up to 50% on Sleepy&#39;s, Beautyrest &amp; more&nbsp;

LMHD 2 - Stacked DDs

Holiday Deals: Up to 50% OFF&nbsp; Sleepys, Beautyrest &amp; more!&nbsp;

4-Day Sale

4-Day Sale: Save up to 60% on select Sleepy&#39;s, Sealy &amp; more&nbsp;

Cyber Deals

Cyber Deals! Up to 50% OFF&nbsp;select mattresses, bedding&nbsp;&amp; more!&nbsp;