6788 Full Size Griddle for Weber Genesis II 300 Series - Heavy Duty

In this review of the 6788 full size griddle insert, the bottom line is simple: it is a practical upgrade for Genesis II 300 series owners who want to convert their grill into a versatile flat-top cooking surface. The reviewer found the griddle measures 25.6in x 18.67in x 1.19in and fits 2016-and-newer Genesis II models, offering a rust-resistant, heavy-duty surface that handles pancakes, eggs, burgers and stir-fries with consistent heat. Its full-width grease tray and dual handles make installation and cleanup straightforward for regular backyard cooks.

Key Features

• Full-size fit: The griddle measures 25.6in x 18.67in x 1.19in, so it converts the entire grill grid into a single flat cooking area for large batches.
• Model compatibility: Designed for Weber Genesis II 300 series and compatible LX 340 models from 2016 and newer, it replaces the 6788-style grate without modification.
• Heavy-duty construction: Made from carbon steel with a rust-resistant finish and thick material to resist warping under high heat.
• Grease management: A full-width grease tray system channels drips away from food, helping keep the cooking surface cleaner while grilling fatty foods.
• Dual handles: Two built-in handles make the griddle easier to place and remove from the grill, improving safety when hot.
• Seasonable nonstick: The griddle benefits from seasoning before use to build a durable nonstick surface and simplify cleanup.

Who It's For

This griddle is ideal for backyard cooks who already own a compatible Genesis II 300 series or LX 340 model and who frequently prepare breakfast items, stir-fries, or foods that benefit from a flat cooking plane. It is especially useful for families or hosts who want to cook large quantities at once, such as multiple pancakes or scrambled eggs.

It is less appropriate for owners of grills outside the listed Genesis II models or for buyers who prefer a lightweight, portable griddle; this is a heavy, grill-specific insert that requires seasoning and some care when cleaning.

Pros & Cons

Pros

• Excellent fit and compatibility for Genesis II 300 series grills, turning the entire grate into a usable griddle.
• Sturdy carbon steel construction provides even heat and resists warping under high temperatures.
• Nonstick potential after proper seasoning makes cooking and cleaning easier for many foods.
• Full-width grease tray and dual handles improve cleanup and handling safety.

Cons

• Substantial weight makes it cumbersome to lift and handle compared with thinner griddles.
• Requires seasoning and is not dishwasher safe, adding a short break-in and care routine.

Specifications

Product type	Full-size grill griddle insert
Dimensions	25.6in x 18.67in x 1.19in
Compatible models	Weber Genesis II 300 series and LX 340 series (2016 and newer)
Material	Heavy-duty carbon steel, rust-resistant
Grease system	Full-width grease tray
Handles	Dual built-in handles for easier removal
Care	Season before use, clean with soap and water; not dishwasher safe

Our Verdict

The 6788 full size griddle is a sensible upgrade for Genesis II 300 series owners who want reliable, flat-top performance and easy grease management. It delivers durable heat distribution and a potentially excellent nonstick surface after seasoning, representing strong value for cooks who need a large, grill-specific griddle and do not mind the extra weight and initial care routine.

Frequently Asked Questions

Will this fit my Genesis II 300 series grill?
Yes, it is designed to fit Genesis II 300 series models and many LX 340 series grills made in 2016 or later.

How do I prepare the griddle before cooking?
Clean with soap and water, apply a thin layer of oil, heat until smoking, cool, and repeat 2-3 times to build a durable nonstick seasoning.

Is it dishwasher safe?
No, the griddle is not dishwasher safe and should be hand washed to preserve the seasoning and finish.