A Weber Slate and a Blackstone-style flat top share a solid outdoor plate, but not the same cooktop or size ladder. This article compares official area, zone, fuel, and first-use figures for representative models — without a price table, because those numbers change too often to lock into a guide.
Two official mid-to-large examples sit close enough in role to compare, and far enough apart in published numbers to matter. A current Blackstone 36-inch class is described in the brand’s buying guide as four independently controlled zones, 60,000 BTUs, and 768 square inches. The Weber Slate 30-inch rust-resistant griddle lists three burners, 36,000 BTU-per-hour input, and 540 square inches, on a pre-seasoned, rust-resistant carbon-steel cooktop that Weber says reaches over 500°F. Those figures are the start of a buying decision, not a winner’s podium.
A Weber Slate and a Blackstone-style flat top both cook on a solid plate with independent burners, but not the same cooktop recipe. The Slate 30-inch lists 540 square inches, 36k BTU, and three burners on pre-seasoned carbon steel. A Blackstone 36-inch class lists 768 square inches, 60k BTU, and four zones on seasoned steel.
This page stays with published specifications. For the wider alternatives map, see Blackstone alternatives: other outdoor griddles and combos. The topic hub is the outdoor griddle guide. Sibling comparisons cover Camp Chef and Traeger Flatrock.
Blackstone’s everyday outdoor line is a family of steel flat tops sized by plate width: 17, 22, 28, and 36 inches, as explained in its buying guide. Bare-steel outdoor models are seasoned by the owner; indoor electric models are a separate family. A current 36-inch hooded example lists 64.5" × 36.5" × 30" and 135 pounds on the product page.
Weber’s Slate line is a rust-resistant carbon-steel family. The 30-inch stand-up model lists a pre-seasoned cooktop, no coating (metal tools allowed), wind guards, two side tables, 140.34 pounds, and liquid-propane or natural-gas versions. Tabletop 17- and 22-inch Slate models, and a 36-inch model, have their own official sheets — a 36-inch natural-gas listing, for example, publishes 48,000 BTU-per-hour input and 756 square inches. Do not copy the 30-inch numbers onto those other sizes.
BTU is burner input, not the temperature of a burger. More input can help a larger plate recover after you drop on cold food, but wind, lid or hood, and plate mass still decide what you feel on the steel. Zones matter more for mixed menus: three independently controlled burners on the Slate 30-inch versus four on a Blackstone 36-inch class. A two-zone Blackstone 28-inch cart is a closer zone count to the Slate 30, with a different area and cooktop story. Read the SKU, not the brand average.
Weber describes the Slate cooktop as carbon steel transformed under heat and pressure to reduce rust, then pre-seasoned with food-safe oils so it is ready to cook out of the box. That is a published starting point, not a claim that the plate can be left wet. Blackstone’s outdoor steel plates follow a first-use seasoning routine in the official seasoning guide. If you want to start cooking the day the box is opened, the Slate language is aimed at that job. If you are comfortable building a seasoning film, a bare-steel Blackstone-style plate is a known path.
Weber calls out wind guards around the Slate burners and a cooktop set close to the flame. Blackstone carts typically rely on the plate, a hood on some models, and the cart body; check the exact SKU for a hood or hard cover, which is not always included. Grease systems also differ by model — front access, rear channels, or a large drip pan on the Slate 30-inch — so compare the diagram, not a lifestyle photo.
For placement around a house or deck, use each manual and the NFPA grilling safety page. For doneness, use the USDA FSIS temperature chart.
| Weber Slate 30-inch (official page) | Blackstone 36-inch class / hooded example | |
|---|---|---|
| Cooking area | 540 sq in (cookbox 30.31" W × 18.31" D) | 768 sq in (buying guide, 36-inch class) |
| Burners / zones | 3 independently controlled burners | 4 independently controlled zones |
| Input | 36,000 BTU-per-hour | 60,000 BTU (buying guide, 36-inch class) |
| Cooktop | Pre-seasoned, rust-resistant carbon steel; no coating | Steel flat top; owner seasons bare-steel outdoor models |
| Weight (example) | 140.34 lb | 135 lb (current hooded 36-inch product page) |
| Fuel options | Liquid propane or natural gas (separate versions) | Typically propane; some lines offer natural gas — confirm the SKU |
| Other official notes | Wind guards; reaches over 500°F (maker’s statement) | Overall width on a hooded example: 64.5" |
This is a 30-inch Slate versus a 36-inch Blackstone class, because those are the official mid/large sheets buyers most often put side by side. A closer area match would be a Blackstone 28-inch cart or a Slate 36-inch model; pull those sheets if that is the comparison you actually need.
If the reason you are looking at a Weber or a Blackstone cart is that you also want grate marks, neither standalone griddle solves that. A grill-and-griddle island does. Big Horn’s grill and griddle combo lists 675 square inches of mixed surface (grate 23.8" × 16.5", griddle 18.1" × 15.6"), six tubular burners at 65,000 BTU, and a sink and refrigerator. Browse grills and griddles when you are choosing a surface mix rather than a single plate.
Choose the Slate path if a pre-seasoned, rust-resistant carbon-steel top, wind guards, and a natural-gas option on some models are the published features you want, and 540 square inches on the 30-inch model is enough — or step to the official 36-inch Slate sheet. Choose a Blackstone-style 36-inch class if you want the larger published area and four zones, and you will season and cover a steel plate. Measure overall width in either case. Do not treat this as a quality score; it is a spec match.
No. Both sell outdoor flat tops in the examples here, but the cooktops, size ladders, and fuel options differ. Weber’s Slate 30-inch is a pre-seasoned rust-resistant carbon-steel top with three burners; a Blackstone 36-inch class is a four-zone steel plate described at 768 square inches in the brand’s buying guide.
That depends on the job, not on a universal score. Compare official area, zone count, cooktop treatment, fuel type, overall width, and warranty language for the exact models in your cart. A “better” logo is not a specification.
Weber sells standalone Slate griddles, and it also sells griddle accessories for some of its grate grills. Those are different products. If you already own a compatible Weber gas grill, an insert or griddle plate is a smaller change than buying a full Slate cart; confirm fit on the current accessory page for your grill model.
A plate is the more direct tool for eggs, smash burgers, and mixed breakfasts. A grate grill is the more direct tool for marks and lid-on cooks. Many households keep both, or use a combo island, instead of forcing one surface to do the other’s job.
Weber and Blackstone are trademarks of their respective owners. Big Horn Outdoors is not affiliated with or endorsed by Weber or Blackstone.
