Set your expectations before you drive: Desert Diamond Why is the smallest casino in Arizona worth listing, and it is best understood as a highway stop that happens to have slot machines rather than a casino that happens to be remote.
It carries a 4.4 rating, the highest of any Arizona property we cover, from just 56 Google reviewers. That combination is the whole review in one line — almost nobody goes, and the people who do are glad it exists.
What is actually there
Roughly 5,000 square feet of floor, holding about 40 slot and video poker machines. There are no table games, no poker room, no hotel.
Alongside the machines: a deli, a convenience store, and a self-serve gas station with restrooms and space for RVs to pull in.
That last part is not a footnote. On this stretch of the Sonoran Desert, fuel and a clean restroom are genuinely scarce, and the casino is the reason both exist at this milepost.
Where it is, and why that is confusing
The property sits on Highway 86 at milepost 55, just east of Why and near Ajo, in Pima County on the Tohono O'odham Nation.
Google returns only a plus-code location for it rather than a street address, which tells you most of what you need to know about the setting. If you are navigating, aim for the Highway 86 and Highway 85 junction at Why and continue east on 86.
It is about two hours west of Tucson and a long way from anything else. Organ Pipe Cactus National Monument and the Ajo area are the reasons most visitors are on this road at all.
Hours
Open seven days a week, 10:00am to midnight. Not 24 hours, which matters on a road where the next option is far away, and late arrivals do get caught out.
Who runs it
The Tohono O'odham Nation, through Desert Diamond Casinos & Entertainment. It was formerly called Golden Ha:san Casino and is still signed and listed that way in places, which causes a fair amount of confusion online.
It is the smallest of the Nation's four Desert Diamond properties. The gaming enterprise funds tribal government operations and infrastructure across the Nation, and at a site like this the community function is more visible than the commercial one.
Is casino gambling legal in Arizona?
At tribal properties, yes, under the tribal-state gaming compacts. Desert Diamond Why operates under the Tohono O'odham Nation's compact. You must be 21 to play the machines, though the store and fuel are open to anyone.
Worth stopping?
If you are driving Highway 86 between Tucson and Ajo, yes — stop for the fuel, the deli and the restrooms, and put twenty dollars through a machine while you stretch your legs. It is a pleasant, well-kept building and the staff are the reason that 4.4 exists.
If you are considering it as a gambling destination, do not. Forty machines is a bar's worth, and Desert Diamond West Valley or the Tucson properties offer the real Desert Diamond experience with full floors and live tables.
Judge it as desert infrastructure and it is excellent. Judge it as a casino and it barely qualifies.
FAQ
How many slot machines does Desert Diamond Why have?
About 40 slot and video poker machines across roughly 5,000 square feet. There are no table games.
Where is Desert Diamond Casino Why?
On Highway 86 at milepost 55, just east of Why and near Ajo, on the Tohono O'odham Nation in Pima County.
What are the hours?
10:00am to midnight, seven days a week. It is not open 24 hours.
Is there a hotel?
No. There is a deli, a convenience store and a self-serve gas station with RV space, but no accommodation.
Was this casino called something else?
Yes, it was formerly Golden Ha:san Casino and is still referred to by that name in some listings.
How far is it from Tucson?
About two hours west along Highway 86.
Comparing Arizona rooms? See Desert Diamond West Valley, Talking Stick Resort and all Arizona in-person casinos.
Updated September 2026 · Details verified against Desert Diamond and Arizona Department of Gaming listings. Hours and machine counts change, and this is a small rural property. Confirm before you drive.
