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Outsunny 6' x 4' x 7' Twin Wall Polycarbonate Walk-In Garden Greenhouse

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Available in three sizes, Outsunny's polycarbonate mini walk-in greenhouse kit is best for protecting plants from the elements in early spring. This style can go anywhere, from your balcony or patio to the backyard. It's rust-resistant frame is made of powder-coated aluminum alloy to make it both lightweight and sturdy. At just six feet long, four feet wide, and seven feet tall, it comes in at under 50 pounds, so you can easily move it. The base is galvanized for stability, but it might not be able to withstand inclement weather, and that kind of damage isn't covered under the warranty.

Transparent twin wall polycarbonate sheets are 4mm thick, which allows natural light in and traps heat and moisture throughout the day to keep plants toasty at night. Some reviewers note that they secured their panels in place with silicon. The high quality, water-resistant, transparent plastic covering is also UV-resistant, which means they block harmful UV rays to protect the polycarbonate panels themselves as well as plants. Like a couple of our other options below, this greenhouse has a sliding door, which can be a space saver. A rooftop vent keeps air flowing, while its gutters can help collect rainwater. If you can put together Legos, you can easily assemble this greenhouse. Plus, there's free shipping!

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Outsunny 15' x 7' x 7' Outdoor Portable Walk-In Greenhouse with Windows

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From the same brand that brought you the polycarbonate version above comes this portable option that has a see-through plastic cover made of heavy-duty polyethylene to provide durable plant protection and extend your growing season at a fraction of the price. This tunnel-looking greenhouse comes in sizes ranging from 10 feet to 20, available in deep green, green, or white. Its steel tube frame is powder-coated to resist rust, corrosion, chipping, and peeling. Weighing in at just 36.5 pounds, this particular greenhouse is 15 feet long, seven feet wide, and seven feet tall. It has six velcro closure windows on the sides that roll up, revealing netting that allows for ventilation. Those under six foot two won't have to crouch down to get in the zippered door, which can be attached to the top to stay open. Everything that you (and a friend or two) need to assemble this baby comes in the box, as well as four tie-down ropes and ground stakes for additional stability. Another big draw for buying from Aosom is free shipping, which we all know can get expensive with large items.

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'Palmetto' - 8' x 10' Aluminum & Glass Greenhouse Kit

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Janco's Palmetto greenhouse kit is pricier because it's handmade in the USA out of rust-resistant aluminum and 1/8” clear tempered safety glass. Plus, it comes with a lifetime warranty. Weighing in at 900 pounds, this heavy-duty sucker is built to withstand the elements, from wind to snow. Temperature-sensitive passive solar ridge vents automatically open and close cold frame lids, greenhouse windows, and skylights throughout the day to maintain a constant interior climate without using batteries or electricity!

Everything is pre-fabricated, pre-cut, and pre-drilled for easy assembly. This model features butyl sealants, which don't deteriorate like the rubber that many manufacturers use. Swap the glass for unbreakable 8mm clear twin wall polycarbonate at no extra cost. The door doesn't come with a screen, but you can buy a screen package. Other additional accessories include glass shelves, plant benches, exterior shades, and vent screens.

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Exaco Junior Orangerie J-ORA 116 Square Foot Greenhouse

Highly Rated
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Exaco's t-shaped Junior Orangerie Greenhouse offers 116 square feet of indoor gardening area. At just under 1,000 pounds, this beautiful old fashioned English-style greenhouse is 13 feet long, just over 10 wide and about eight feet tall at its highest point, while the sidewalls are just over five feet high. Its frame is made of strong, thick aluminum and the included tempered glass windows are 4 mm thick, held in place by substantial rubber seals for insulation purposes. This model also features automatic opening roof window vents and one sliding frame door. Shelving, sprinkler system, and shade nets are not included but can be purchased. This bad boy will take a few days to set up, or you can find a greenhouse installer by calling the Austin-based Exaco retailer at 877-760-8500 ext 701.

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Green Panels Large Walk-in Greenhouse

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Our only wood option, this modular greenhouse manufactured by a small family run business called NW Green Panels who are committed to building quality products with attention to detail. Handmade out of extremely durable and beautifully stained incense cedar, its 2x4 construction stands up to the most intense climates. Its super cool self regulating ridge-line vent system is "passive," which means it's heat activated and does not require any electricity. Dual wall polycarbonate panels are shatter-proof and are 8mm thick to hold in heat in the winter. Easy to follow YouTube instruction videos make for a super simple setup that only takes a few hours.

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GrowIT® Greenhouse-in-a-Box, 10 ft. x 10 ft. x 8 ft.

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If you're looking for a basic, affordable greenhouse that is easy to set up, then this Shelterlogic kit is for you. At eight feet tall, the powder-coated all-steel frame offers a 10x10 foot workspace. The structure's durable translucent polyethylene cover diffuses light, but is also coated with a UV-resistant treatment to prevent the summer sun from weathering the plastic. It may look like a tent, but the cover is actually waterproof.

The kit comes with easy to clip on ratchets to fit the cover snugly to the frame and prevent pests. Between the roll-up side panels, double-zippered door, and zippered half-moon end-panel, there's plenty of airflow. It comes with a one year warranty, and replacement covers are available if needed.

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Grandio Element Walk-In Greenhouse

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Grandio's 6x8 foot walk-in greenhouse is perfect for those with limited space. The classic A-frame design is also available in 6x4 and 6x12. It's 10mm twin-wall clear polycarbonate panels provide plenty of insulation in the winter, while the heavy-duty powder-coated aluminum frame resists rust. The panels are backed by a 10-year warranty, while the manufacturer guarantees this product against any defects for a lifetime on the frame.

Double sliding doors are about six feet tall, while the roof height is seven feet. The basic kit includes two roof windows to assist with ventilation and rain gutters, but for a few hundred dollars more you can get the premium kit, which features two automatic roof vent openers, some plant hangers, a trellis kit, a drip kit, and a cleaning cloth. There are also a variety of anchoring systems that work with an earth, wood, or a concrete slab base. A video accompanies the written instructions, but you'll probably need another person to assist with assembly.

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FarmHouse Walk-In Greenhouse

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FarmHouse's unique design allows you to zip multiple greenhouses together, so you could create a whole network of greenhouses if you wanted to create multiple temperature environments. These compact, lightweight pop-ups are perfect for temporary use because they require minimal assembly, so they're easy to set up, take down, and transport. Two screened doors and 12-screened vent openings allow for optimum air circulation while open and high humidity levels when closed. The outer walls are made with Gro-Tec material that is 100% waterproof, UV resistant, and rip-resistant. At eight feet deep, nine feet wide, and nine feet deep, there's plenty of space for your plants. It also features four portholes so you can feed in hoses and power cords. Purchase the Flower Forcer accessory to block light when needed. They also sell a shelve set.