8 High Tunnel Kits for Building Your Own Hoop House

Building a high tunnel, or hoop house, is one of the most impactful investments a small-scale farmer can make. It’s the key to unlocking a longer growing season, protecting crops from unpredictable weather, and producing higher-quality vegetables. Choosing the right kit is the critical first step, determining whether your structure becomes a productive asset or a constant source of frustration.

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What to Consider Before Buying a High Tunnel Kit

Before you even look at a catalog, walk your property. The right high tunnel kit depends entirely on your specific site, climate, and goals. The first major decision is size and shape. A Gothic arch, with its peaked roof, is far better at shedding snow than a traditional Quonset (rounded) design, making it a must-have in northern climates. For width, a 12- to 14-foot tunnel is manageable for a single person to work in, while wider tunnels (20-30 feet) offer more growing space but require more labor and materials.

Next, consider your local weather patterns. If you live in an open, windy area, you need a kit with thicker-gauge steel and closer bow spacing (4-foot spacing is better than 6-foot). This adds cost, but it’s cheaper than replacing a collapsed tunnel. Also, think about your construction skills and available help. Some kits are truly all-inclusive, while others require you to source your own lumber and pipe, trading convenience for a lower upfront cost. Be realistic about the time and effort you can commit to the build.

Finally, evaluate your long-term plans. A simple, low-cost caterpillar tunnel is perfect for extending the season for low-growing crops and can be moved to rotate beds. However, if you plan to grow tall, vining crops like tomatoes and cucumbers year after year, investing in a stationary tunnel with high sidewalls will provide far more usable space and better airflow. Your first tunnel is a piece of farm infrastructure; choose one that will serve your needs for years to come.

Starter High Tunnel – Bootstrap Farmer DIY Hoop House Kit

For the farmer who wants to build a sturdy, reliable structure without paying for parts they can source locally, a DIY kit is the smartest starting point. It provides the most critical and hard-to-fabricate components—the steel hoops, hardware, and specialized fittings—while you supply the standard lumber and plastic. This approach cuts down significantly on shipping costs and gives you control over the quality of your materials.

The Bootstrap Farmer DIY Hoop House Kit is the best pick in this category. Bootstrap Farmer has built a reputation on quality materials and clear, farmer-focused instructions. Their kits are designed for practicality, using heavy-gauge, American-made steel that won’t buckle under a moderate snow load. The package includes everything you need to form the skeleton of the structure, including ground posts, pre-bent hoops (or a bender to make your own), and all the brackets and bolts.

The key consideration here is that this is not an all-in-one box. You are responsible for purchasing the greenhouse plastic, the lumber for baseboards and end walls, and the wire lock channel to attach the plastic. This is a significant advantage for budget-conscious growers but a potential hurdle for those short on time. This kit is perfect for the hands-on farmer who is comfortable with a hardware store shopping list and wants a professional-grade frame without the full-package price tag. It’s not for someone who wants every single piece to arrive on one pallet.

Gothic Arch Kit – Growers Solution High Tunnel Greenhouse

In climates with any significant snowfall, a Gothic arch is not a luxury; it’s a necessity. The pointed peak of the arch actively sheds snow and rain, preventing dangerous load accumulation that can collapse a standard Quonset-style hoop house. This design also provides more overhead clearance away from the center, increasing the usable growing space inside.

The High Tunnel Greenhouse from Growers Solution is an excellent, accessible choice for a Gothic arch structure. It strikes a great balance between affordability and durability, featuring a galvanized steel frame that resists rust and corrosion. The kits are comprehensive, including the frame, purlins (braces that run the length of the tunnel for added rigidity), and all the necessary hardware for assembly. This structure is engineered to handle weather, not just shield plants from a light frost.

When building a Gothic kit, pay close attention to the bracing. The strength of the peak relies on all components being properly installed and tightened. Growers Solution provides solid instructions, but it’s on you to ensure the structure is square and secure. These kits are ideal for growers in the Midwest, Northeast, or any mountain region where snow is a regular occurrence. If you live in a mild, dry climate, the extra cost and complexity of a Gothic arch may not be necessary.

High-Wind Kit – Tunnel Vision Hoops Zephyr High Tunnel

Wind is a high tunnel’s worst enemy. A constant barrage of wind can fatigue the structure, loosen the plastic, and eventually lead to catastrophic failure. In exposed, windy locations, a standard-duty kit is a liability. You need a structure specifically engineered to withstand that relentless pressure.

The Tunnel Vision Hoops Zephyr High Tunnel is built for exactly these conditions. This kit prioritizes strength above all else, using a heavy-gauge (14-gauge or thicker) steel frame with bows spaced a tight 4 feet apart. This density of steel, combined with five full-length purlins and robust corner braces, creates an incredibly rigid structure that sheds wind rather than catching it. The engineering is focused on transferring wind load safely into the ground.

Building a high-wind kit requires an uncompromising approach to anchoring. Standard ground posts are not enough; you will need to set the posts in concrete or use specialized anchoring systems to prevent uplift. The Zephyr is a heavier, more expensive kit, and its assembly is more labor-intensive due to the increased number of components. This is the right choice for farmers on the plains, in coastal areas, or on exposed hilltops. For a sheltered location, this level of reinforcement is overkill.

Movable Tunnel – Farmers Friend Caterpillar Tunnel Kit

Not every farm needs a permanent, 40-foot-long high tunnel. For intensive vegetable growers practicing crop rotation, a movable structure offers incredible flexibility. A caterpillar tunnel allows you to give different plots the benefit of season extension, soil warming, and pest protection throughout the year without the expense of building multiple permanent structures.

The Farmers Friend Caterpillar Tunnel Kit is the gold standard for this application. It’s a brilliantly simple and effective design, consisting of steel hoops, a central purlin, and a single sheet of plastic secured with ropes. The entire structure is lightweight enough to be moved by two people—you simply pull up the rebar anchors, walk the tunnel to a new bed, and re-anchor it. This allows you to start spring greens in one spot, move it to cover early tomatoes, and then shift it again to protect fall kale.

It’s crucial to understand what a caterpillar tunnel is and isn’t. It’s an affordable, versatile season extender, but it is not a high-wind or heavy-snow structure. It is lower to the ground than a traditional high tunnel and is not designed to be left in place through a harsh winter. This kit is perfect for market gardeners and serious homesteaders who want to maximize the productivity of their garden beds. It is not a substitute for a permanent, all-weather high tunnel.

Preparing Your Site for High Tunnel Construction

The success of your high tunnel is determined long before the first steel bow is raised. Proper site preparation is non-negotiable. The ideal location is level, well-drained, and receives at least six to eight hours of direct sunlight per day, even in the winter. Avoid low-lying areas where water pools or cold air settles.

Orientation is a key decision. An east-west orientation maximizes sun exposure during the low-light winter months, which is ideal for overwintering crops. A north-south orientation provides more even light distribution throughout the day during the main growing season, reducing the risk of plants shading each other. For most four-season growers, east-west is preferable. Before you build, clear the site of all vegetation, rocks, and debris. Tilling the footprint can help level the ground and makes it easier to drive in the ground posts.

Finally, think about logistics. How will you get water to the tunnel? Is there a nearby power source for fans or a heater? Consider prevailing wind direction; if possible, orient the tunnel so the narrow end walls face the wind. A little foresight during the planning phase will save you countless hours of labor and frustration down the road.

High-Side Tunnel – Four Season Tools High-Side Kit

Standard hoop houses are efficient, but their curved walls mean you lose a significant amount of usable space near the edges. For anyone growing tall or vining crops, this is a major limitation. A high-side tunnel solves this problem by incorporating short, vertical sidewalls before the roof arch begins, creating a nearly rectangular interior space.

The Four Season Tools High-Side Kit is a farmer-designed solution that maximizes every square foot. By raising the point where the curve starts to 4, 5, or even 6 feet, you can trellis tomatoes or cucumbers right up to the edge and walk comfortably without hunching over. This design also dramatically improves ventilation when paired with roll-up sides, as the larger opening allows hot air to escape more effectively.

The added height and vertical walls come with considerations. These structures catch more wind and require more robust anchoring and bracing than a low-profile Quonset. They are also more expensive due to the additional materials and engineering. However, for a market farmer specializing in high-value vining crops, the increased productivity and improved working environment can quickly justify the investment. This kit is a game-changer for serious growers but is less critical for those focused on low-growing greens or root vegetables.

Professional Grade Kit – FarmTek Gothic Pro Greenhouse

When your hobby farm starts to look more like a small business, it’s time to invest in professional-grade infrastructure. A pro-level kit is designed for longevity, efficiency, and customization. It’s a permanent structure built from superior materials, intended to withstand decades of use with proper maintenance.

FarmTek’s Gothic Pro Greenhouse line is a benchmark for quality in the industry. These kits are built with heavy-duty, triple-galvanized steel frames that offer exceptional corrosion resistance. What sets them apart is the degree of customization. You can choose from a wide range of sizes, foundation options, ventilation systems (roll-up sides, louvers, fans), and door configurations to create a growing environment perfectly suited to your crops and climate.

This is not a beginner’s kit. The upfront cost is significant, and the assembly is a complex project requiring careful planning and a small team. You are buying a system, not just a frame. This level of investment is best for the established grower who has identified a bottleneck in their production and knows that a larger, more permanent, and more efficient structure is the solution. It’s the right move when you’re ready to transition from season extension to year-round production.

Heavy-Duty Frame – Rimol Sturdi-Built Greenhouse Kit

For growers in regions with extreme weather, particularly heavy snow, structural failure is a constant worry. A standard high tunnel might survive a few winters, but a single blizzard can destroy it. When you absolutely cannot afford a collapse, you need a frame engineered specifically for heavy loads.

The Rimol Sturdi-Built Greenhouse Kit is designed with a singular focus on strength. Rimol uses oval-shaped steel tubing for their bows, which provides significantly more strength and rigidity against downward pressure than comparable round tubing. Their kits are engineered and certified for specific snow and wind load ratings, giving you documented assurance that your structure can handle what your climate throws at it.

This level of durability comes at a price. The materials are heavier, the cost is higher, and the construction is more demanding. You’ll need to ensure your foundation and anchoring are just as robust as the frame itself. This kit is the definitive choice for farmers in places like New England, the Upper Midwest, or high-altitude locations. For growers in the South or on the West Coast, the Sturdi-Built’s heavy-duty engineering is likely more than you need.

All-Inclusive Kit – Yoder’s Quality Yoderbilt Tunnel

Sourcing all the individual components for a high tunnel—frame, plastic, hardware, lumber, wire lock—can be a time-consuming and frustrating process. An all-inclusive kit eliminates the guesswork and the multiple shopping trips, delivering everything you need to build the complete structure on a single pallet.

The Yoderbilt Tunnel from Yoder’s Quality Greenhouses is an outstanding example of a truly complete package. These Amish-made kits are renowned for their quality and attention to detail. A typical Yoderbilt kit includes the galvanized steel frame, high-quality 6-mil greenhouse plastic, all hardware, pre-bent purlins, wind bracing, and even the pre-cut, pressure-treated lumber for the baseboards and end walls. They also come standard with roll-up sides, a feature that is often an expensive add-on from other companies.

The primary benefit is convenience. You save an enormous amount of time and eliminate the risk of ordering the wrong parts. The trade-off is a higher upfront cost and potentially significant shipping fees due to the weight of the lumber. This kit is the perfect solution for the busy farmer or homesteader who values their time highly and wants to get their tunnel built quickly and correctly, without the hassle of sourcing materials from multiple suppliers.

Outfitting Your Hoop House for Four-Season Use

A high tunnel frame and plastic are just the beginning. To transform it into a true four-season growing space, you need to manage the internal environment. The most critical component is ventilation. Without it, a sealed tunnel can overheat in minutes, even on a cool, sunny day. Manually-operated roll-up sides are the simplest and most effective solution, allowing you to vent the entire length of the structure.

In the heat of summer, even with the sides rolled up, the sun can be too intense for many crops. This is where shade cloth becomes essential. A 30-50% shade cloth draped over the tunnel can drop the internal temperature by 10-15°F, preventing heat stress and sunscald on sensitive plants like lettuce and peppers. It’s a simple addition that makes summer production possible.

For winter, insulation is key. Many growers add a second layer of greenhouse plastic to the inside of the frame, using a small inflation fan to blow air between the two layers. This trapped air pocket acts as a powerful insulator, significantly reducing heat loss and protecting crops from deep freezes. Combined with the use of heavy frost blankets (like Agribon) draped directly over the crops on the coldest nights, this system can allow you to harvest hardy greens right through the winter.

Long-Term Maintenance for Your High Tunnel Structure

Your high tunnel is a long-term investment; a few hours of preventative maintenance each year will protect it and extend its life indefinitely. The most important annual task is to go through and check and tighten all bolts and hardware. The constant expansion and contraction of the metal frame, along with wind vibration, can cause connections to loosen over time. A snug frame is a strong frame.

The greenhouse plastic is the most vulnerable component. Inspect it each season for small rips or tears, especially around the baseboards and end walls where it is most likely to chafe. Use a specialized greenhouse repair tape to patch any holes immediately; a small tear can quickly become a large one in a windstorm. Most high-quality plastics are UV-stabilized and should last at least four to five years, but their lifespan depends heavily on your climate and sun intensity.

Finally, manage your winter snow load proactively. While a Gothic arch helps, wet, heavy snow can still accumulate. Never let more than a few inches build up on the roof. Use a soft-bristled push broom or a purpose-built snow rake to gently push the snow off from the inside or outside. A few minutes of clearing snow after a storm can prevent the kind of catastrophic frame failure that can undo all of your hard work.

A high tunnel is more than just a structure; it’s a tool that grants you greater control over your growing environment. By carefully matching the right kit to your climate, goals, and building style, you can create a highly productive space that will feed your family and customers for years. The work you put into building it right will pay dividends every season.