Say cheese! There are lots of cheesy reasons for bargain hunters to smile on National Cheeseburger Day, Friday, September 18, 2026. While there are many stories regarding the birth of the cheeseburger, many believe it all started right here in Denver. Back in 1935, a trademark for the name “cheeseburger” was awarded to Louis Ballast of the Humpty Dumpty Drive-In in Denver.
Photo: Smashburger
The only true story is that everyone loves a juicy cheeseburger. Even better, when it’s with fries and a shake!
And, because of the endless possibilities of the bun, cheese, condiments and toppings, everyone can create and enjoy their own “perfect cheeseburger.”
The deals are only valid at participating locations and cannot be combined with any other discount or promotion. Limit one offer per person, while supplies last.
For most, there are no protein substitutions allo—wed — only beef burgers. Plus, none of the offers are available for third-party delivery.
Check back here for the latest updates.
Image: Bad Daddy’s Burger Bar
Bad Daddy’s Burger Bar
Go spicy on National Cheeseburger Day!
On September 18, 2026, Bad Daddy’s Burger Bar is offering its limited-time Jalapeño Business burger (with a Classic Side) for just $10 — for dine-in only.
The bold burger is stacked with cheddar cheese, fresh jalapeño slices, a housemade raspberry bacon jam and finished with a flash-fried fresh jalapeño — for the perfect balance of sweet, smoky and spicy!
There are 9 locations in Colorado.
Photo: Buffalo Wild Wings
Buffalo Wild Wings
Go wild on National Cheeseburger Day!
On September 18, 2026, Buffalo Wild Wings is offering a buy-one-get-one FREE Cheeseburger. The offer is not valid on lunch combo or kids’ menu burgers.
There are 27 locations in Colorado.
Burger King
Get treated like royalty at Burger King on National Cheeseburger Day!
On September 18, 2026, the popular fast-food restaurant is offering a FREE Bacon Cheeseburger with a $3 minimum purchase — exclusively for Royal Perks members.
The giveaway is part of Burger King’s Perks Week celebration — from September 14 to 20, 2026.
Carl’s Jr.
Hang out with Carl’s Jr. on National Cheeseburger Day!
Dairy Queen
Chill out at Dairy Queen on National Cheeseburger Day!
From September 14 to 18, 2026, DQ is offering a FREE Original Cheeseburger Signature Stackburger with any purchase of $1 or more. The offer is only available in the DQ app.
There are 77 locations in Colorado. However, not all locations serve the full menu, so double-check first.
Denny’s
Celebrate National Cheeseburger Day with Denny’s!
On September 18, 2026, Denny’s is offering a buy-one-get-one 50% off Diner QP Burger.
Part of the restaurant’s new Triple Play menu, the Diner QP burger consists of a 100% all-beef patty, American cheese, diced onion, pickles, mustard and ketchup — all on a Brioche bun.
Find locations in Colorado here.
Dog Haus
Hot dog! It’s a National Cheeseburger Day deal from Dog Haus!
Dog Haus is giving customers who purchase a cheeseburger through their loyalty account on September 18, 2026 a reward for a FREE cheeseburger on a future visit.
There are two locations in Colorado — Centennial and Denver.
Dollar General
There’s nothing better than a juicy gift card discount from their favorite restaurant for cheeseburger lovers!
In celebration of National Cheeseburger Day, Dollar General is offering 20% off on gift cards from select restaurants on September 18, 2026, including Applebee’s, Burger King, McDonald’s, Wendy’s and more.
Five Guys
Five Guys, one juicy deal, three days!
From September 16 to 18, 2026, Five Guys is offering a rare buy-one-get-one FREE burger — in celebration of National Cheeseburger Day.
Get the required promo code here.
Good Times
Have a good time on National Cheeseburger Day!
On September 18, 2026, Good Times is celebrating the cheesy day with a regular-sized Deluxe Cheeseburger for just $2.99 — available in-restaurant and via the Good Times app.
Even better, Good Times is offering any size fountain drink for just $1 in September!
KFC
Just wing it on National Cheeseburger Day! If cheeseburgers aren’t your thing, head over to KFC for chicken wings!
Through September 21, 2026, KFC is giving away a FREE 10-piece bucket of chicken wings with a $15+ digital purchase.
You could enjoy the FREE wings alongside a bargain cheeseburger on September 18 for a truly frugal feast.
McDonald’s
The Golden Arches has been serving its iconic cheeseburgers for more than 85 years, so it’s the perfect place to celebrate National Cheeseburger Day.
On September 18, 2026, McDonald’s is offering a FREE Double Cheeseburger with a $1 minimum purchase.
The cheesy deal is only available for MyMcDonald’s Rewards members.
Perkins Restaurant & Bakery
Celebrate the cheesy day at Perkins Restaurant & Bakery with the ultimate dinner trio BFP (burger, fries and pie!) — starting at just $10.99.
There are 3 locations in Colorado — Colorado Springs, Longmont and Loveland.
Smashburger
In celebration of National Cheeseburger Day, Denver-born Smashburger is offering a cheesy deal for cheeseburger fans!
On September 18, 2026, Smashburger is offering Any Single Smashburger for just $1— exclusively for SmashRewards members. Any add-ons cost extra.
Smashburger has 21 locations in Colorado.
Sonic Drive-In
Pull up for a good deal at Sonic Drive-In on National Cheeseburger Day!
On September 18, 2026, Sonic Drive-In is offering a Jr. Double Cheeseburger for just $1.90 — available all day.
The cheesy deal is open to all customers.
Whataburger
What a National Cheeseburger Day deal at Whataburger!
On September 18, 2026, Whataburger is offering a FREE Bacon & Cheese Whataburger Jr. with the purchase of a medium fry and medium drink — exclusively for Whataburger Rewards members.
There are 10 locations in Colorado.
Hungry for more food deals?
Various Locations
CO
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