Cooked?
In-N-Out Burger #15
- gradeGrade A
- inspection score99 pts
- critical violations0
- last inspectedJanuary 22, 2026
- address21133 E Golden Springs Dr, Diamond Bar 91765
Is In-N-Out Burger #15 clean?
In-N-Out Burger #15 is currently Grade A from LA County Department of Public Health, Environmental Health, from an inspection on January 22, 2026. No critical violations were recorded at that visit. On Cooked's ladder that reads clean 😇.
What did inspectors find at In-N-Out Burger #15?
These are the violations recorded at the most recent inspection on January 22, 2026, in plain English, with the city's own wording underneath.
- ⚠️FLOORS, WALLS AND CEILINGS PROPERLY BUILT, MAINTAINED AND CLEANFLOORS, WALLS AND CEILINGS PROPERLY BUILT, MAINTAINED AND CLEAN
When was In-N-Out Burger #15 last inspected?
In-N-Out Burger #15 has 2 inspections on record going back to April 1, 2024, averaging 98 points.
| date | result | score |
|---|---|---|
| January 22, 2026 | Grade A | 99 pts |
| April 1, 2024 | Grade A | 97 pts |
In-N-Out Burger #15 vs Walnut
Walnut runs 97% clean across 115 tracked restaurants — 112 clean, 3 mid, 0 cooked.
Against the 115 spots Cooked tracks in Walnut, this one comes out cleaner than 90% of them.
Other spots in Walnut
How Los Angeles grades restaurants
Los Angeles County posts a letter placard in the window, and unlike New York the score runs the friendly way: higher is better. 90 to 100 points earns an A, 80 to 89 a B, and anything below that a C. The county inspects roughly every six months to a year depending on risk, and a failed inspection can close a kitchen until it is fixed. Because LA’s scores are final at the time of inspection — there is no pending window — a letter can be read straight off the score when the placard field is blank.
Source: LA County Department of Public Health, Environmental Health via LA County Open Data. Cooked refreshes this data daily — this listing's most recent inspection is dated January 22, 2026. Inspection results describe one moment in a kitchen's life, not a permanent verdict.