Smashburger
Smashburger is a burger chain whose official FAQ addresses allergens and food preparation, naming milk, eggs, wheat, soy, sesame, peanuts, tree nuts, fish, and shellfish among the allergens its food may contain. The FAQ states that fried items are prepared in shared fryers in 100% beef tallow and that all items are prepared on shared equipment. It also notes that Udi's gluten-free buns are offered, while its kitchens handle gluten-containing ingredients.
The chain's own allergen material
- Evidence tier
- Allergen menu documented
- Format
- faq · document date not stated
- Website
- www.smashburger.com
Source: Smashburger FAQ, allergen information (smashburger.com) · Last checked: 2026-10-28
The allergen matrix, as published
Smashburger addresses 9 of the 10 allergens we track in its published allergen material. "Not addressed" means the chain's document does not cover that allergen — it does not mean the allergen is absent from the food.
| Allergen | Addressed in the chain's published material |
|---|---|
| Gluten | Not addressed Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
| Milk | Yes — covered in the published material Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
| Egg | Yes — covered in the published material Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
| Peanut | Yes — covered in the published material Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
| Tree nut | Yes — covered in the published material Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
| Fish | Yes — covered in the published material Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
| Shellfish | Yes — covered in the published material Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
| Soy | Yes — covered in the published material Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
| Wheat | Yes — covered in the published material Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
| Sesame | Yes — covered in the published material Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
The chain's own cross-contact statement
Smashburger states that all of its menu items are prepared using shared equipment, including fried items cooked in shared fryers, and that cross-contact with allergens may occur.
Quoted/summarised from Smashburger FAQ, allergen information (smashburger.com), checked 2026-10-28.
The protocol, in full: Chain protocol
| Allergen menu | Smashburger's official FAQ includes an allergen section naming the common allergens its menu items may contain and directs guests to its nutrition page to review item-level allergen information and customize items for dietary needs. Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
|---|---|
| Dedicated facility | Not documented — not published in source (not documented) Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
| Dedicated fryer | Not documented — not published in source (not documented) Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
| Dedicated prep | Not documented — not published in source (not documented) Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
| Staff training | Not documented — not published in source (not documented) Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
| Order flagging | Guests with food allergies are advised to review the allergen information before ordering and to speak with their local restaurant. Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
| Cross-contact statement | All menu items are prepared using shared equipment, including shared fryers; fries, tots, and other fried items are cooked in 100% beef tallow, shared preparation areas are used, and cross-contact with allergens may occur, so the chain states it cannot ensure an item is free from allergen concerns. Smashburger FAQ, allergen information (smashburger.com) · 2026-10-28 |
Good to know before you book
- Smashburger states that all of its menu items are prepared using shared equipment, including fried items cooked in shared fryers, and that cross-contact with allergens may occur. — Smashburger FAQ, allergen information (smashburger.com), 2026-10-28
- New chain. Source is the chain's official FAQ rather than a standalone matrix, so format is faq with itemByItem false; the FAQ links an item-level nutrition and allergen tool hosted for the brand. Gluten is not charted as an allergen in the FAQ, so it is not included in allergensAddressed. — Smashburger FAQ, allergen information (smashburger.com), 2026-10-28
Questions diners ask about Smashburger
Does Smashburger publish an allergen menu or matrix?
Yes — Smashburger publishes allergen material in faq form, linked from this page and last checked on 2026-10-28. It addresses 9 of the 10 allergens we track.
Which allergens does Smashburger's published material not cover?
It does not address: Gluten. Not addressed means the chain's document is silent on that allergen — not that the allergen is absent from the food.
If Smashburger publishes a protocol, does every location follow it the same way?
A chain document is a ceiling, not a location guarantee. Locations vary in staff, equipment and practice, so a location listing on this site carries its own tier and its own last-checked date, and the questions on the visit-prep card are the ones to ask at the location you are visiting.
What does Smashburger itself say about cross-contact?
Smashburger states that all of its menu items are prepared using shared equipment, including fried items cooked in shared fryers, and that cross-contact with allergens may occur.
Source & freshness
Source: Smashburger FAQ, allergen information (smashburger.com) · Last checked: 2026-10-28
Report a change or an error — reports are checked and logged on this page.
Change log
- 2026-10-28 — Chain protocol profile published from the chain's own published allergen material (datasets v1 + expansion pass 2, merged Oct 28, 2026).
Other chains
- Chipotle — Allergen menu documented, last checked 2026-10-28
- Olive Garden — Allergen menu documented, last checked 2026-10-28
- McDonald's — Allergen menu documented, last checked 2026-10-28
- P.F. Chang's — Allergen menu documented, last checked 2026-10-28
- Shake Shack — Allergen menu documented, last checked 2026-10-28
- Chick-fil-A — Allergen menu documented, last checked 2026-10-28
Smashburger — visit-prep card (chain level)
Allergen menu documented · Last checked 2026-10-28 · Source: Smashburger FAQ, allergen information (smashburger.com)
Chain-level record — practices vary by location. Confirm at your location before ordering.
- Allergen menu
- https://smashburger.com/faq
Allergens the chain's material addresses
Milk, Egg, Peanut, Tree nut, Fish, Shellfish, Soy, Wheat, Sesame
The chain's cross-contact statement
Smashburger states that all of its menu items are prepared using shared equipment, including fried items cooked in shared fryers, and that cross-contact with allergens may occur.
Questions to ask at your location
- Is the fryer shared with breaded or battered items, and what else is cooked in that oil?
- Is there a separate prep area, boards and utensils for allergy orders?
- How are staff trained on food allergies, and how often is that training refreshed?
- Which parts of the kitchen, if any, are kept free of my allergen?
- Does this location follow the chain's published allergen procedure, and who here is trained on it?
ConfidentDiner collects allergen and preparation information from restaurants’ published materials, from restaurants themselves, and from diners. Information is dated and sourced, but menus, ingredients, suppliers, staff, and kitchen practices change without notice, and cross-contact can occur in any non-dedicated kitchen. Nothing on this site is medical advice or a guarantee that any restaurant or dish is safe for any individual. Always tell the restaurant about your allergy, confirm current practices directly before ordering, and make your own decision with your medical professional’s guidance.