Can You Leave a Corten Steel BBQ Grill Outside in the Rain?
Date:2026.04.30
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For barbecue enthusiasts, there is nothing more worrying than spending a small fortune on a corten steel barbecue, only to see it rust, become damaged and have its lifespan drastically reduced by a sudden downpour.
Traditional steel barbecues often need to be moved indoors frequently or covered with heavy protective covers; otherwise, they will soon suffer from peeling paint and structural corrosion, greatly diminishing the enjoyment of outdoor cooking.
Corten steel, however, is entirely different – not only is it impervious to rain, but it requires the cleansing effect of rainwater to unleash its remarkable self-protective properties.
This article will delve into the ‘survival mechanism’ of Corten steel BBQ grillsin the rain, explaining why rainwater not only fails to destroy them but enhances their unique industrial aesthetic, whilst also providing practical maintenance tips to help you completely overcome the challenges of the rainy season.
Weathering steel barbecue grills precisely address the industry-wide pain point of traditional barbecues being 'rain-prone and easily damaged’. With no need for cumbersome moving or covering, they allow you to enjoy the pleasures of outdoor cooking to the full all year round.
To answer directly: yes. You can leave your corten steel outdoor grill out in the rain with complete peace of mind; in fact, it can be left outdoors all year round.
The unique properties of the material give it excellent natural resistance to rain, which is the key reason why Corten steel is the material of choice for high-end outdoor kitchens.
Rain is not only harmless to a high quality corten steel outdoor kitchen grill, but essential – it is a necessary condition for the formation of a protective rust layer (patina) on the surface of the corten steel.
However, it is important to note that the manner in which it is exposed to the rain directly determines its lifespan. Only by avoiding prolonged waterlogging and neglecting maintenance can an outdoor bbq grill remain durable for the long term. A corten steel barbecue grill is a ‘low-maintenance companion’ designed for the outdoors; it can easily withstand the test of rain without requiring special care, affecting neither its performance nor its appearance.
Why Corten Grillsare Rain-Resistant: The Mechanism Behind the Formation of the Copper Patina
Many people mistakenly believe that corten steel is a type of stainless steel, but its durability works on a completely different principle. Its core advantage lies in its unique patina.
The Basis of the Patina: A Naturally Formed ‘Protective Armour’
The corrosion resistance of durable outdoor barbecue grill stems from the fact that, upon contact with rain and air, a dense, amorphous oxide layer naturally forms on the surface—what we refer to as the patina.
This patina acts like a natural ‘protective coating’, firmly sealing the underlying metal and preventing further penetration of oxygen and moisture, thereby achieving a corrosion- and rust-resistant effect. Corten steel primarily consists of iron, along with alloys such as copper, chromium and nickel. These alloys promote the formation of a stable protective patina, significantly enhancing corrosion resistance and slowing down the overall rate of corrosion.
Key Condition: Alternating Wet and Dry Conditions are Essential for the Formation of a Stable Patina
The stable formation of the patina relies on an environment of ‘alternating wet and dry’ conditions. Rain brings moisture, whilst sunlight and wind bring dryness; it is the interplay of these two factors that allows the patina to become dense and robust.
If a rusted steel barbecue grill is left in a persistently damp state for a long period, the patina will be unable to form properly; instead, corrosion will intensify.
Normal Patina vs. Abnormal Corrosion: Distinguishing At a Glance
When using a corten steel barbecue grill, there is no need to worry about surface rust. The key is to learn to distinguish between ‘normal patina’ and ‘abnormal corrosion’ to avoid misjudgement leading to improper maintenance.
Normal patina: The surface displays an even reddish-brown or dark chocolate colour. It feels firm to the touch, with no signs of loosening or flaking; this indicates a healthy protective state.
Abnormal corrosion: Large, flaky patches of rust peeling off in specific areas, or the appearance of pitting and perforations. This is usually linked to prolonged water accumulation at the base, corrosion from food residues, or blocked drainage holes.
Enhanced Aesthetics: Rainwater Adds Texture to Corten SteelGrills
The unique charm of a corten steel barbecue grill lies in its ‘evolution over time’. Repeated exposure to rainwater causes the patina to gradually deepen in colour and become increasingly refined in texture.
This naturally formed industrial aesthetic cannot be replicated by artificial paint, making your corten steel BBQ grill a unique visual focal point in your garden that gains character the more you use it.
Which Parts of a Corten Steel Barbecue Are Most Vulnerable to Rain?
Although corten steel itself is rain-resistant, the various components of a barbecue are made from different materials, and not all of them are as ‘rain-resistant’ as the main body. The following areas require particular attention and protection.
Combustion Chamber and Base: The Most Prone Areas for Water Accumulation
The combustion chamber and base are the parts of the barbecue where water is most likely to accumulate. If the drainage design is inadequate or the drainage holes are blocked, rainwater will remain trapped inside the unit for extended periods.
Prolonged water accumulation keeps the corten steel in a persistently damp state, preventing the formation of a stable patina. This accelerates localised corrosion and, in severe cases, can lead to perforation of the main body.
Ventilation and Exhaust Ports: ‘Blind Spots’ Prone to Dampness
The narrow gaps in ventilation and exhaust ports make it difficult for rainwater to evaporate once it seeps in, easily creating a persistently damp environment. This not only affects the ease of subsequent ignition but may also cause unweatherproofed internal components to oxidise and rust, thereby reducing the barbecue’s overall lifespan.
Grill Grates: A Key Factor in Food Safety
As the grill grates come into direct contact with food, the high humidity on rainy days can cause rapid scaling or the appearance of loose rust spots on their surface. If not cleaned promptly, these rust spots may transfer to the food, compromising food safety, whilst also reducing the grates’ lifespan and user experience.
Hardware Components: The ‘Vulnerable Link’ Prone to Failure
Hardware components such as screws, hinges and electrical terminals on barbecues generally lack the weather resistance of corten steel. Once rainwater seeps in, it can easily cause these components to rust, jam, or even lead to electrical faults, affecting the barbecue’s normal operation. By focusing on protecting these areas, your corten steel barbecue will easily withstand the erosion of rainwater and accompany you through decades of outdoor cooking.
To keep your corten steel BBQ grill in top condition during rainy weather, you need not spend a great deal of time; simply carry out a quick pre-rain inspection and a post-rain reset.
5-Minute Pre-Rain Quick Check
Clear drainage holes: Check the drainage holes at the base of the barbecue to ensure they are not blocked by ash or food residue, preventing rainwater from pooling. Remove food residue: Thoroughly clean away grease and salt from the interior of the grill and the grates, as these substances absorb moisture and accelerate metal corrosion. Covering as required: In the event of prolonged heavy rain, we recommend using a breathable, waterproof cover to keep out the rain whilst preventing condensation from forming inside.
Quick Post-Rain Maintenance
Wipe Dry Hard-to-Reach Areas: After rain, prioritise wiping dry recessed areas prone to water accumulation, such as handles and seams on the grill body, to prevent prolonged dampness. Check for Rust: Inspect the surface of the grill body; if you notice unusual flaky rust or pitting, treat it promptly to prevent further corrosion. Light a fire to dry: Provided it is safe to do so, briefly light the barbecue to use the heat to quickly evaporate moisture inside the unit and in crevices, helping the Corten steel return to a dry state and promoting the stable formation of the patina.
How to Safely Store an Outdoor Corten BBQ Grill During the Rainy Season?
If you plan to leave your corten bbq grill outside throughout the rainy season, adopting a scientific protection strategy will not only extend its service life but also ensure you can host a barbecue party at any time.
Choose a Breathable, Waterproof Cover: Prevent The Equipment From Being ‘Stifled’
Prioritise a breathable, waterproof cover specifically designed for corten steel barbecues grills; the key requirements are ‘waterproof + breathable’. This effectively blocks external rainwater whilst allowing internal condensation to dissipate quickly, preventing dampness, mould or abnormal corrosion caused by excessive sealing. Remember not to use ordinary plastic sheeting as a cover.
Optimize Placement and Drainage: Prevent Water Accumulation at Source
When purchasing, prioritise rusted steel BBQ grill with a scientific drainage system at the base; this is key to preventing rainwater accumulation. When positioning the barbecue, place it on level or slightly sloping ground to ensure rainwater flows smoothly out of the drainage holes, preventing prolonged water accumulation at the base.
Protecting Key Areas: Minimizing Direct Exposure to Rain
Before rainfall, close the barbecue lid to prevent rainwater from entering the combustion chamber and ventilation openings directly, thereby reducing the likelihood of internal components becoming damp. Position the barbecue away from the drip line of walls or areas where water drips from leaves, as the constant high-pressure dripping from these locations can disrupt the formation of the patina on the Corten steel surface.
Safety Warning: Do Not Leave Your BBQ Grill In the Rain Under These Circumstances
Although corten steel is exceptionally durable, prolonged exposure to rain under the following extreme conditions or where maintenance is neglected can pose safety risks. We recommend taking prompt action or moving the barbecue to a sheltered area.
Prolonged Water Accumulation at the Base
If poor drainage causes water to pool at the base for extended periods, or if the ground subsides, leading to the base being repeatedly flooded after rain, this will accelerate corrosion of the grill body, ultimately resulting in perforation and damage.
Uncleared ‘Grease + Moisture’
If residual grease and salt are not promptly cleaned from the grill after use, and the grill is placed directly in a damp environment, the grease and salt will combine with moisture to create an acidic environment, rapidly corroding the metal surface.
Extreme Environmental Conditions
In coastal areas with high salt fog or regions with high levels of industrial emissions, corrosive agents in the air can disrupt corten steel’s self-repairing mechanism, accelerating the corrosion rate and necessitating enhanced protection.
Existing Structural Damage
If the grill body already exhibits obvious structural damage such as pitting or cracked welds, rainwater will seep through these fissures into the interior, causing irreversible deep-seated damage. In such cases, the grill must be moved immediately for repair.
3-Step Maintenance for BBQ Grills After Rain: Easily Restore to Optimal Condition
After a heavy downpour, just three simple steps are all it takes to restore your corten BBQ grill to its original condition, prevent corrosion risks and extend its service life.
Thorough Cleaning: Eliminate Corrosion Risks
Promptly scrape away food residues from the interior of the barbecue and the grill tray, and thoroughly remove any residual grease. Salt and grease absorb moisture; if left uncleaned, they will significantly accelerate localised rusting.
Forced Drying: Removing Deep-Seated Moisture
Provided it is safe to do so, open the barbecue lid and briefly light the appliance. Use the heat to rapidly evaporate moisture that is difficult to wipe away from inside the chamber and in crevices, helping the corten steel to dry out as quickly as possible.
Protective Maintenance: Ensuring Long-Term Care
Once the barbecue has cooled completely, replace the breathable, waterproof cover to ensure proper air circulation inside. At the same time, check that the drainage holes are clear, inspect the grill grates for rust, and check the tightness of screws and other metal fittings. Address minor issues promptly to prevent them from escalating.
Buying Guide: Choose the Right Corten Grill and Say Goodbye to Rainy Season Worries
To truly enjoy ‘peace of mind’ during the rainy season, choosing the right corten steel barbecue grill is crucial. Before placing your order, pay close attention to the following key rain-resistant specifications to avoid any pitfalls.
Prioritise Professional Drainage Structures
Whether the base of the metal BBQ grill features a scientifically designed drainage system is key to preventing rainwater accumulation and corrosion. High-quality corten steel barbecues are typically equipped with multiple drainage holes to ensure rapid water drainage. At the same time, we recommend choosing products with a wall thickness of 3mm or more. Such Corten steel barbecues offer greater structural integrity, have an extremely low annual corrosion rate, and can be used reliably for decades.
Verify the Weather Resistance of Hardware Components
Check whether key connecting parts, such as screws and hinges, are made from weather-resistant materials or have undergone special weatherproofing treatment to prevent components from jamming or malfunctioning due to rainwater erosion. Furthermore, prioritise corten steel barbecue grills with fully welded or reinforced structures to ensure they remain stable and sturdy in high-temperature and rainy conditions.
Use Brand-Specific Protective Covers
Opt for breathable, waterproof covers supplied by the manufacturer. This eliminates the need to match sizes yourself, ensures better protection, and provides a perfect fit for the BBQ grill’s structural design.
Consider Structural Stability and Dimensions
Select a rusted steel bbq barbecue grill of a suitable size based on the dimensions of your outdoor space. Additionally, choose models with a sturdy base to prevent structural wear caused by frequent movement, which could compromise its weather resistance. If you are unsure whether the dimensions are suitable, please send us a photo of your outdoor space. We will provide you with a free corten steel bbq grill placement assessment to help you select the perfect model.
FAQ: Addressing Concerns About Using BBQ Grills In the Rainy Season
Q1: Will a Corten Steel Grill Corrode Rapidly Or Develop Holes When Exposed to Rain?
A: No. Provided the corten steel has a wall thickness of 3mm or more, the self-healing patina that forms effectively prevents corrosion from penetrating the metal. Even when exposed to prolonged rain, the structural lifespan remains impressive, far exceeding that of ordinary steel.
Q2: Do I Need to Cover My Corten Steel Barbecue With a Protective Cover Every Day During the Rainy Season?
A: No. Normal cycles of wet and dry conditions aid the formation of the patina. Only during prolonged heavy rainfall is it advisable to cover the barbecue with a breathable, waterproof cover to prevent water from accumulating inside the grill.
Q3: Will Covering the Corten Steel BBQ Grill With a Protective Cover Damage It?
A: Only the use of non-breathable, ordinary plastic sheeting will prevent internal condensation from dissipating, leading to moisture-related corrosion. Choose a specialised breathable, waterproof cover that will both protect against rain and ensure air circulation, so it will not damage the equipment.
Q4: Can a Corten Steel Grill Be Left Outdoors Year-Round in Coastal Areas?
A: Yes, but it requires extra maintenance. Salt spray in coastal areas accelerates corrosion, so it is advisable to regularly rinse the surface of the barbecue with fresh water to remove salt, and to strictly follow the drying procedure after rain.
Q5: How Long After Barbecuing Should I Cover the Corten Steel BBQ Grill With a Protective Cover?
A: You must wait until the barbecue has cooled completely to room temperature (usually taking several hours). Covering it too soon will not only damage the cover but also trap residual heat and steam inside the grill, accelerating metal oxidation.
Are You Ready to Choose a Corten Steel Barbecue Grill That’s Just Right for You?
Corten steel barbecue grills are naturally rain-resistant, so you can leave them outside in the rain with complete peace of mind. Not only will the rain not damage them, but it will help form a unique patina, making them more durable and aesthetically pleasing. To ensure your rusted steel BBQ grill lasts for decades, there are just four key steps to follow: prevent water from pooling at the base, clear away residue promptly, use a breathable, waterproof cover, and dry and inspect it thoroughly after rain. This will not only allow the patina to deepen and stabilise, but also significantly reduce the risk of abnormal corrosion, making it a timeless centrepiece for outdoor cooking in your garden. If you’re already tempted but unsure how to choose or maintain a corten grill, please contact us via the following methods: 1. Browse our range of high-quality corten steel BBQ grills; all products are optimised for rainy conditions and designed for year-round outdoor use, combining durability with aesthetic appeal.
2. Contact our experts for a one-on-one professional consultation to help you select the perfect Corten steel barbecue for your outdoor space and answer any questions you may have.
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