"Northern Arizona's best burger rides a branded English muffin and local grass-fed beef since 2009 — worth the walk for a solo lunch."
About Diablo Burger
The best burger in northern Arizona is built on an English muffin. Diablo Burger has griddled local, grass-fed beef onto its own logo-branded muffin buns in downtown Flagstaff's Heritage Square since 2009, and the weekend line out the door settles the argument.
Owner Derrick Widmark, a former filmmaker who moved west from Manhattan, sources every patty from the Diablo Trust — a collective of two historic ranches, the Flying M and the Bar T Bar — and pairs them with Belgian-style frites. For the wider city, the Flagstaff dining guide maps every reviewed table.
The Kitchen
The kitchen runs a tight menu of named burgers on those branded muffins. The Vitamin B stacks bacon, beets and blue cheese; other builds rotate through local cheeses, chiles and house condiments. The beef is 100% open-range, grass-fed and grass-finished from the Diablo Trust ranches, and the frites are cooked Belgian-style and salted hard.
It is a small counter operation with a fierce local following, not a fine-dining room — but it does one thing as well as anyone in the state. Diners after a sit-down dinner should see Shift Kitchen & Bar.
The Room
The space is pocket-sized — a counter, a handful of tables and a patio on Heritage Square. You order at the counter and grab a seat; at peak times the line spills onto the square. It is loud, casual and quick, the opposite of a reservation restaurant.
Best for Solo Dining
Diablo Burger is built for a fast, satisfying meal alone or with a couple of friends: counter service, a great burger, frites and out. It suits solo dining or a casual team lunch downtown.
Not for
Not for a quiet date, large seated groups, or anyone who wants table service and a long wine list — this is a counter burger joint, busy and loud.
Frequently Asked
Who owns Diablo Burger in Flagstaff?
Diablo Burger is owned by Derrick Widmark, a former filmmaker who moved from Manhattan and opened it in 2009. He sources beef from the local Diablo Trust ranching collective.
What makes Diablo Burger's burgers different?
The burgers use 100% open-range, grass-fed and grass-finished beef from the Diablo Trust's Flying M and Bar T Bar ranches, served on the restaurant's own logo-branded English-muffin buns with Belgian-style frites.
Where is Diablo Burger located?
It sits in Heritage Square in downtown Flagstaff, a small counter space with a patio on the square.
Does Diablo Burger take reservations?
No. It is a counter-service operation with no reservations, and the line can spill onto Heritage Square at busy weekend times.
How long has Diablo Burger been open?
Diablo Burger has operated in downtown Flagstaff since 2009.
Reserve a Table
Reserve at Diablo Burger
Counter service, no reservations — expect a line at weekends.
Affiliate disclosure: Restaurants for Kings may earn a commission when you book through our reservation links, at no cost to you. Our scores are editorial and never paid for.
Practical Information
Address120 N Leroux St, Heritage Square, Flagstaff
NeighbourhoodHeritage Square
CuisineBurgers
PriceBurgers around $11
Dress CodeCasual
SeatingCounter, small tables and patio
ReservationNo reservations
