That's an excellent question, and one that every new garden bench owner should ask! The answer isn't a simple yes or no, as it depends entirely on the manufacturer and the specific bench you purchase.
Many higher-quality wooden garden benches, especially those made from durable woods like cedar, redwood, or premium pressure-treated pine, often come pre-treated with a water-repellent preservative or a light stain from the factory. This "pre-treatment" is typically a basic protective layer meant to shield the wood during shipping and storage. It is not usually a permanent, full-seal finish. You should always check the product description or contact the seller directly to confirm the treatment status.
Even if your bench is pre-treated, applying your own sealant is highly recommended for long-term protection. Think of the factory treatment as a primer; your own coat of a high-quality sealant, stain, or outdoor-rated wood oil is the main defense. This DIY step is crucial for blocking moisture, preventing UV damage from the sun, and resisting mold and mildew. It significantly extends the life and beauty of your bench.
For a bench that arrives untreated, sealing it yourself is essential before placing it outdoors. Start by ensuring the wood is clean and dry. Then, choose a product designed for exterior use—such as a penetrating sealant, a tinted deck stain, or a spar urethane for clear protection. Apply it evenly according to the instructions, paying extra attention to end grains and joints. Reapplying this finish every one to two years, depending on your local climate and sun exposure, will keep your bench looking great for seasons to come.
In short, while some benches have a starter treatment, taking the time to apply and maintain your own protective seal is the best way to ensure your wooden bench remains a beautiful and sturdy retreat in your garden for many years.