Finding the right 300 gallon round stock tank and accessories can protect water, livestock, and outdoor setups from weather and debris. This guide highlights top-rated 300-gallon stock tank products and covers to help you compare durability, fit, and weather resistance. Each entry includes a brief overview of standout features to aid in quick shopping decisions for American buyers.
| Product | Brand | 300-Gallon Fit | Key Feature |
|---|---|---|---|
| Stock Tank (300 Gallon) Structural Foam | Rubbermaid Commercial Products | Yes | Durable rigid-cell construction; USA-made; 10-year warranty |
| 300 Gallon Oval Tank Cover | Lametta | Yes | Waterproof, UV resistant, insulated, with air vent |
| 300 Gallon Stock Tank Cover | StorMaster | Yes | Keeps debris out; lightweight yet sturdy; heat retention |
| 8 Feet Stock Tank Pool Cover (Round) | iBirdie | Yes | Heavy-duty 600D fabric; weatherproof; precise fit for round tanks |
| Round Mega Stock Tank Cover (390-Gallon) | Tarter | Fits larger tanks; commonly used for 300+ gallon tanks | Rust-resistant coating; rounded top; safety for livestock |
The following sections profile five selected products most relevant to 300-gallon round stock tanks, including a quick overview and practical notes to help you compare options for weather, durability, and fit.
Rubbermaid 300-Gallon Stock Tank: Structural Foam

The Rubbermaid Commercial Products stock tank offers a 300-gallon capacity with rigid-cell foam construction for long-lasting durability in varied outdoor weather. This model is designed for heavy-duty use with a category-leading 10-year warranty and is proudly made in the USA. The rugged construction helps resist cracking and deformation when exposed to temperature swings, sun, and moisture, making it suitable for livestock, water storage, or makeshift pools and baths.
Lametta 300 Gallon Oval Tank Cover

The 300-gallon oval stock tank cover by Lametta is designed to fit most 300-gallon oval stock tanks. It features waterproof 600D fabric with UV protection to prevent fading, an air vent to reduce condensation, and a snug fit to keep dirt, debris, and temperature fluctuations at bay. The cover helps maintain water quality and reduces maintenance time by shielding the tank from wind, rain, and sunlight.
StorMaster 300 Gallon Stock Tank Cover

The StorMaster cover is tailored for a 300-gallon stock tank, offering a lightweight yet sturdy protective layer. It helps minimize pollen, leaves, and other contaminants entering the tank while aiding heat retention to keep water temperature more stable. Easy to install and remove, the cover is a practical accessory for year-round outdoor use.
iBirdie 8 Feet Round Stock Tank Pool Cover

The iBirdie stock tank pool cover is designed for round tanks around 95 to 97 inches in diameter, with an 8-foot length. It uses a heavy-duty 600D fabric construction that provides reliable weatherproofing across seasons. The cover is designed to fit snugly and protect the tank from rain, wind, and debris, while aiming to simplify seasonal storage and maintenance of outdoor water features or cold plunge pools.
Tarter Round Mega Stock Tank Cover (390 Gallon)

The Tarter Round Mega Stock Tank Cover is designed for larger tanks, including models around 390 gallons. Its rust-resistant coating and rounded top provide durable protection against the elements. While slightly larger than a standard 300-gallon unit, this cover can accommodate many 300-gallon round tanks, offering an extended fit for broader use and livestock safety.
Buying Guide: Key Purchase Considerations
- Tank compatibility: Confirm the tank’s diameter and shape (round vs. oval) to ensure a proper fit for covers and accessories. 300-gallon round and oval tanks vary in exact dimensions, so check product measurements and customer questions sections when available.
- Weather resistance: Look for UV protection, waterproof or water-repellent materials, and weatherproof seams to maximize durability in sun, rain, and cold. Insulation options can help with temperature stability for water or baths.
- Durability and warranty: For heavy outdoor use, select products with rigid construction, reinforced seams, and long warranties. American-made options may provide additional confidence in quality control.
- Ease of use: Choose covers and accessories that install quickly, stay in place during wind, and allow easy removal for cleaning or refilling. Lightweight materials with secure fasteners are beneficial.
- Maintenance needs: Consider how easy it is to clean, dry, and store covers when not in use. Some covers include ventilation features to reduce moisture buildup.
- Safety and livestock considerations: Ensure that edges are rounded and surfaces are non-slip to protect animals. Proper fit reduces risk of movement that could injure livestock or degrade water quality.
- Accessory ecosystem: If you already own a Rubbermaid or other brand tank, verifying compatibility with existing components (drain kits, vents, or other covers) can simplify upgrades.