Genesis Cooking Grates for Weber Genesis 300 Series - Cast Iron

Our review of the Genesis Cooking Grates for Weber Genesis 300 Series looks at whether these cast iron replacement grates are a practical upgrade for owners of older Genesis E/EP and S models. The bottom line: these heavy cast iron grates are for homeowners who want improved searing and more even heat retention, especially for grills built between 2007 and 2016. They replace the original rod-style bars with thicker cast iron that holds temperature better and delivers professional sear marks, making them a clear choice if fit and heat performance are top priorities.

Key Features

• Exact fit for specified models: Designed to fit Weber Genesis 300 Series grills with front or side mount control knobs from the listed model years, providing a direct replacement without modification.
• Heavy cast iron construction: The thicker cast iron material retains heat and creates pronounced sear marks, helping to brown meat more evenly than thinner porcelain rod bars.
• Durability over porcelain: Cast iron does not chip or rust out like porcelain enameled rod bars, offering longer-lasting service when maintained properly.
• Two-piece set dimensions: Each grate measures 19.5 x 12.9 in and the pair covers 19.5 x 25.8 in, matching the cooking surface area expected for Genesis 300 Series grills.
• Works with other compatible grills: Besides listed Genesis models, these grates are noted to fit certain Pit Boss PB700 Series grills, expanding their usability.
• Improved cooking evenness: The extra mass of the grates heats and distributes temperature more evenly across the surface, reducing cold spots during searing.

Who It's For

These grates are ideal for owners of Weber Genesis 300 Series grills (Genesis E/EP 310 & 320 from 2007-2016, Genesis S 310 and 320 in the listed years, and Genesis 330 variants) who want a durable cast iron replacement that sears better and holds heat longer. If the original rod-style bars are worn or you want a more professional sear, these grates deliver a tangible upgrade in cooking performance.

Customers with Genesis II 300 series or Genesis II LX 300 series should look elsewhere because these grates do not fit those newer models. Also, buyers who prefer low-maintenance porcelain-coated bars that never need seasoning should consider that cast iron requires periodic care to avoid rust.

Pros & Cons

Pros

• Fit: Many users report the grates fit older Genesis grills precisely, including very old units, making replacement straightforward.
• Durability: Thick cast iron construction resists chipping and feels sturdier than thin rod bars.
• Performance: Heavier grates sear better and cook more evenly, improving grilling results.
• Value: Customers describe the build quality as comparable to original equipment, offering good value for replacement parts.

Cons

• Weight and maintenance: The grates are heavier than originals and require seasoning and care to prevent rust, which may not suit all users.
• Compatibility limits: They do not fit Genesis II 300 series or Genesis II LX models, so checking model fit is essential.

Specifications

Material	Cast iron
Each grate size	19.5 x 12.9 in
Combined size (2 pcs)	19.5 x 25.8 in
Compatible models	Genesis E/EP 310 & 320 (2007-2016), Genesis S 310 & 320 (listed years), Genesis 330 (2011-2016)
Not compatible with	Genesis II 300 series and Genesis II LX 300 series
Weight note	Heavier than original Weber rod bars for greater heat retention

Our Verdict

For owners of the specified Genesis 300 Series grills who want better searing and even heat, these cast iron grates are a practical and cost-effective replacement. They feel robust, fit the older models well, and improve grilling performance, though they add weight and require routine seasoning to avoid rust. Overall, they are a worthwhile upgrade when fit and cooking results matter most.

Frequently Asked Questions

Do these grates fit my Genesis 300 grill?
They fit Genesis E/EP 310 & 320 (2007-2016), Genesis S 310 (2007-2016) & 320 (2007-2010), and Genesis 330 (2011-2016); confirm your model before buying.

How do cast iron grates compare to porcelain bars?
Cast iron holds heat and sears more effectively and is less prone to chipping, but it needs seasoning and maintenance to prevent rust.

Will they fit Genesis II models?
No, these grates do NOT fit Genesis II 300 series or Genesis II LX 300 series models.