You already own a Weber grill.
It’s a great grill. You love it. But lately you’ve been watching all those Blackstone flat top cooking videos — smash burgers, breakfast spreads, stir fry — and wondering if there’s a way to get that flat top experience without buying a whole new appliance.
The good news? You can.
There are multiple ways to add Blackstone griddle for Weber grill functionality to your existing setup — from official Weber griddle inserts to Blackstone griddle tops that sit directly on your Weber’s grates.
Let’s break down every option, what works best, and which ones are worth your money in 2025.
Table of Contents
Can You Use a Blackstone Griddle on a Weber Grill?
Yes — and it works better than most people expect.
One Weber Summit owner placed a 28″ Blackstone griddle top directly on their Weber S-435’s grill grates. The griddle feet locked into the grates and stayed put. With the 4 main burners on high, the griddle surface hit 600°F. It worked so well, they considered keeping just the griddle top and reselling the Blackstone frame to save deck space. The Virtual Weber Bulletin Board
The key insight here is powerful — your Weber’s BTU output is often higher than a standalone Blackstone griddle. The BTU output of the Weber S670 burners would actually be more output than the 28″ Blackstone itself. The Virtual Weber Bulletin Board
So the combination works — and in some cases, heats better than the original Blackstone setup.
3 Ways to Get Flat Top Griddle Cooking on Your Weber Grill
Option 1 — Official Weber Griddle Insert (Best Fit)
Weber makes their own official griddle inserts specifically designed to replace your existing grill grates and convert your Weber into a flat top griddle.
Simply remove your existing grates, place the griddle into the grill, and enjoy making smashed burgers, bacon, eggs, fajitas, and stir-fries. It comes pre-seasoned with food-safe oils that condition the metal for an extra boost of rust resistance and a natural, easy-release cooking surface that makes it ready to use right out of the box. Weber
The official Weber griddle insert is specifically engineered to fit Weber grill models perfectly — no measuring, no adjusting. It’s the cleanest, most seamless way to add flat top capability to your Weber.
Weber griddle inserts are available for:
- Spirit II 200 Series (2-burner models)
- Spirit/Spirit II 300 Series (2016–2024 models)
- Spirit 400 Series 4-burner (2025 models)
- Genesis II and Genesis series
- Searwood pellet grills
Real owners love the results. One verified buyer said: “I love my new Weber Griddle. It fits perfect in my Genesis II Special Edition. Cooks like a champ. Fried eggs are amazing to cook on this griddle. Best investment I made — I’m 100% happy I didn’t have to buy a Blackstone.” The Home Depot
Another owner confirmed: “Just got the Weber griddle insert on sale. Have seasoned it and used it to make bacon and eggs. Wife says it’s the best she’s had and didn’t heat up the house or stink it up. Plan to make smash burgers this weekend.” The Home Depot
Option 2 — Blackstone Griddle Top on Weber Grates (DIY Approach)
If you already own a Blackstone griddle but want to use just the griddle top on your Weber — this is a surprisingly effective solution.
The Blackstone 28″ griddle top fits on many Weber grill grate setups. With the 4 main burners on high, the griddle surface hit 600°F. The griddle feet locked into the grates so it stayed put. The Virtual Weber Bulletin Board
This approach works particularly well on larger Weber models like the Summit, Genesis, and S-670 series — where the grill opening is wide enough to accommodate the Blackstone griddle plate.
What you need: Just the Blackstone griddle top — no cart, no legs, no propane connection needed. Your Weber’s burners provide all the heat.
Grease management tip: Position the Blackstone griddle top so the drain hits the Weber’s V pan and flows into the normal grease system in the grill. The Virtual Weber Bulletin Board
Blackstone Griddle with Hood – Why You Should Never Buy One Without It
Option 3 — Third-Party Griddle Insert for Weber (Budget Option)
Amazon has a growing selection of third-party griddle inserts specifically designed for Weber grill models — often at lower prices than the official Weber inserts.
These full-size griddle inserts are compatible with Weber Spirit I and II 200 Series, Spirit 300 Series, and 2025 Spirit models. The inserts are positioned closer to the fire source and heat up more easily than griddles placed on top of grates, achieving the temperature needed to cook delicious food. Amazon
Key features to look for in third-party Weber griddle inserts:
- Pre-seasoned carbon steel or ceramic coated surface
- Handles for safe installation and removal
- Rear grease slot that aligns with Weber’s existing grease management system
- Correct model compatibility — always verify your specific Weber model number
Weber Griddle Insert vs Standalone Blackstone — Which Is Better?
This is the most common question Weber owners ask — and the honest answer depends on your cooking frequency and space.
| Feature | Weber Griddle Insert | Standalone Blackstone |
|---|---|---|
| Space Required | ✅ Uses existing grill | ❌ Separate appliance needed |
| Cost | ✅ Less expensive | ❌ Higher upfront cost |
| Cooking Area | ❌ Limited to grill size | ✅ Dedicated full surface |
| Switching Between Grill/Griddle | ❌ Must swap grates | ✅ Always ready |
| BTU Power | ✅ Weber burners powerful | ✅ Dedicated output |
| Grease Management | Uses Weber system | ✅ Dedicated rear system |
| Best For | Occasional griddle cooking | Frequent/dedicated use |
A lot depends on the use case for the griddle and the room you have. Pro of the griddle insert in the Weber is that it saves space and utilizes equipment you already have. Con with a griddle insert in the Weber is going back and forth between the stock grates and the griddle — which can be annoying and cumbersome. The Virtual Weber Bulletin Board
For occasional griddle use, the insert for an existing Weber is all you really need. However, if you’re a heavier user, a standalone makes a lot of sense. The Virtual Weber Bulletin Board
What to Look For When Buying a Weber Griddle Insert
Model Compatibility — Most Critical Factor
This is the number one mistake buyers make — purchasing a griddle insert without verifying compatibility with their specific Weber model.
One frustrated buyer noted that the description stated compatibility with “2016+” Spirit 3-burner, which logically should include 2025 models — but it specifically did not fit the 2025 Spirit 3-burner model. The Home Depot
Always check:
- Your exact Weber model number (found on a sticker inside the grill lid or on the frame)
- The year your grill was manufactured
- The specific burner configuration (2-burner, 3-burner, 4-burner)
Weber’s own compatibility checkers on their website make this easy — use them before buying.
Surface Material
Carbon steel — Seasons like cast iron, develops natural non-stick, excellent heat retention, needs oiling between cooks to prevent rust.
Ceramic coated — Non-stick out of the box, easier to clean, doesn’t require seasoning, but coating can chip over time.
Cast iron — Best heat retention, heaviest, takes longest to heat up but holds temperature well.
For most Weber owners — ceramic coated carbon steel or pre-seasoned carbon steel offers the best balance of performance and maintenance.
Grease Management
The best Weber griddle inserts include a rear grease slot that directs grease into Weber’s existing grease management system. This keeps cleanup as simple as using your Weber normally — without grease pooling on the griddle surface or dripping onto the burners.
Handle Design
Weber griddle inserts get extremely hot during cooking. Look for inserts with removable or folding handles that make safe installation and removal practical — and don’t require you to wait for the insert to cool completely before moving it.
Blackstone Griddle with Hood – Why You Should Never Buy One Without It
How to Use a Griddle Insert on Your Weber Grill
Step 1 — Check Compatibility
Verify your Weber model number and year against the insert’s compatibility list before purchasing.
Step 2 — Remove Your Existing Grates
Lift out your Weber’s existing cooking grates and set them aside. Some owners store them in the cabinet below, others hang them on the side hooks.
Step 3 — Place the Griddle Insert
Set the griddle insert in position on the grill frame where the grates were. Most Weber-specific inserts drop in perfectly without any adjustment needed.
Step 4 — Season Before First Use
Even pre-seasoned inserts benefit from a seasoning session before first use. Turn your Weber burners to medium, let the insert heat for 10 minutes, apply a thin layer of oil, let it smoke off, and repeat 2–3 times.
Step 5 — Cook
Your Weber’s burners heat the griddle insert from below exactly as they heat your regular grates. Adjust burner temperatures as normal to control the griddle surface temperature.
Step 6 — Clean
Push grease and food debris toward the rear grease slot while the surface is still warm. The rear slot directs everything into Weber’s existing grease cup. Apply a thin layer of oil before letting the insert cool.
Real Owner Tips for Using a Blackstone Griddle Top on a Weber
For owners who want to use a Blackstone griddle top directly on their Weber grill grates — here’s what experienced users recommend:
Remove the flavorizer bars on the side where you’ll use the griddle. Taking off the flavorizers on the side you use the griddle allows it to get super hot — especially important if you want a mean sear for smash burgers. The Virtual Weber Bulletin Board
Start all burners on low. Warm up the griddle gradually — usually four burners on low — to prevent warping and ensure even heat distribution across the entire surface. The Virtual Weber Bulletin Board
Check grease alignment. Make sure the Blackstone’s drain holes align over your Weber’s grease collection system to prevent grease overflow.
Use the Weber’s lid as the hood. Weber’s own lid functions exactly like a griddle hood — close it over your food to melt cheese, steam proteins, or trap heat in cold weather.
Is a Blackstone Griddle for Weber Grill Worth It?
Yes — for Weber owners who want flat top capability without a separate appliance.
Whether you choose an official Weber griddle insert, a Blackstone griddle top on your Weber grates, or a third-party insert — you get genuine flat top griddle cooking from your existing Weber setup at a fraction of the cost of a dedicated standalone griddle.
The Weber griddle insert is the cleanest solution — perfect fit, pre-seasoned, and works with Weber’s existing grease management. The Blackstone top on Weber grates is a great option if you already have a Blackstone and want to save patio space.
