Riverstone Monticello Greenhouse 8×20

$4,999.99 $4,499.90

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Riverstone Monticello Greenhouse 8x20

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Monticello LogoThe Monticello manufactured and produced by Riverstone Industries has an above-average interior height, going as high as 7ft 6in at its peak which greatly helps in displacing heat, while also allowing tall gardeners to stand straight up inside their greenhouse.

The automatic roof vent openers, the hinged double doors (6ft x 4.4ft) and the built-in rainwater gutter system ensure that you will be able to grow inside your Monticello greenhouse for many years to come.

The best feature of all is that your Monticello Greenhouse is backed with the STRONGEST 10YR WARRANTY in the industry; covering not only your frame but also the Polycarbonate sidewalls and roof.

Are you looking for years of hassle-free indoor gardening? Are you looking for a commercial-grade greenhouse in a hobby greenhouse package? Then look no further because with Monticello you get it all.

Question: What does this mean for you as the owner?

Answer: It means you are getting a greenhouse that is constructed right here in the USA with the highest quality extruded aluminum, not the more brittle & thinner foreign aluminum. Remember, the weaker the framework the less snow and the less wind it can handle.

Fact: Instead of using the thinner less expensive roofing and wall materials(some as thin as .2mm) Riverstone Industries decided to use 8mm twin-wall Polycarbonate which is the same exact thickness used in commercial greenhouses.

Question: How does this benefit me?

Answer: You choose 8mm twin-wall Polycarbonate for the same reason you choose double pane windows. Because it keeps it cooler during the summer and warmer during the winter. Which in turn cuts down your electric bill, if you choose to grow year-round but also provides for a more efficient grow environment.

Owner Photos of the Riverstone Monticello

Features & Benefits of the Monticello Greenhouse 8×20 (101in x 247in)

  • Heavy-duty frame construction that can withstand high wind and snow loads
  • Uses 85 lbs more aluminum than the average imported greenhouse, which makes it sturdier
  • Frame material: Extruded aluminum (US grade, stronger, thicker)
  • High-impact, UV-stable Polycarbonate glazing
  • Glazing material: 8 mm twin-wall Polycarbonate on roof and walls
  • Faster and easier assembly: Patent-pending Twist & Lock construction, as well as rigid “ribbed” design for interlocking the pieces
  • 4x roof vents (2ft x 2 ft) with automatic openers for great air circulation without the need of electricity
  • Efficient design: $175-$225 of average cost to run greenhouse year-round
  • Expandable: Yes, in 4-foot sections
  • Large double door (4 ft x 6 ft) for easy access with garden equipment
  • Door is hinged and lockable
  • Foundation frame: Integrated flush base design for direct anchoring to the ground or deck
  • Integrated dual gutter system for easy rainwater collection
  • Included: All Aluminum framework, all Polycarbonate panels, set of double doors (assembled), hardware, instruction manual, screwdriver, and wrench
  • Frame Color: Aluminum (natural with protective coating) or Black (electrostatically painted)
  • Snow load capacity: 24lbs/sq. ft. (1,536 lbs)
  • Sidewall height: 58 in (4.8 ft)
  • Peak height (interior): 7.5 ft
  • Exact dimensions: 101in wide x 247in long x 90in high
  • Floor space: 165 sq. ft.
  • Warranty: 10 years on frame and Polycarbonate (strongest in the industry)
  • Made in the USA

Available Packages and Editions

PREMIUM PACKAGE: If you want to start with some accessories right away, you should check out the Monticello Premium. It comes with a workbench system for one side, programmable watering system, sink, and interior shade cloth system. Click here to go to Monticello 8×20 Premium. 

MOJAVE EDITION: If you are living in the desert or any place where it gets quite hot, the Monticello Mojave Edition might be better for you. It has tinted roof panels so that your plants get more protection. It also comes with a solar-powered ventilation system, workbench system for one side, programmable watering system, sink, and Vegi-Bee pollinator. Click here to go to Monticello 8×20 Mojave. 

GROWERS EDITION: If you want to grow cannabis, the Monticello Growers Edition is best for you. It has light defusing panels so that the light distribution is perfect and your privacy is protected at the same time. The Growers Package comes with an electric ventilation system, a workbench system for one side, a commercial heater (17,000 BTU), and a programmable drip irrigation system. Click here to go to Monticello 8×20 Growers.


Is the frame anodized?

Yes & No. The aluminum frame is anodized. However, the black frame is electrostatically painted.

Is the black paint powdercoated?

No, the black paint is electrostatically applied which is stronger than powder coating. It is very difficult to scratch and should not fade dramatically. Riverstone Industries guarantees it for 10 years.

Is the aluminum frame cooler than the black frame?

Yes, the aluminum frame is on average about 7 degrees cooler than the black.

Can the Monticello be attached to a concrete pad? If so what are the dimensions needed for the concrete pad?

Yes, you can use a concrete pad. Riverstone Industries recommends that you add 3 – 4 inchs to the pad on all sides.

For Example: The 8ft x 8ft (exact size of 8.1ft x 8.1ft) would need a concrete pad of 8.4ft x 8.4ft.

Note: Riverstone Industries does not provide concrete screws, you will need to buy these from your local hardware store.

What tools do I need for the assembly or is everything included?

Not everything is included. Here is a list of tools you will need and items included:

  • Work gloves
  • Safety goggles
  • Spirit level
  • Tape measure
  • Step ladder
  • Clear silicone caulk tube
  • 23 1/8 inch spacer (included)
  • 7/16 wrench (included)
  • Philips screwdriver (included)
  • Flat screwdriver (included)
  • 5-foot bungee cord (included)

Can I extend the Monticello Greenhouse later?

Yes, it is expandable in 4ft increments.

We live in a seismically active area south of San Francisco. I’d like to install the greenhouse on a hill. Is this the best greenhouse for my conditions?

Monticellos are very sturdy greenhouses. However, the greenhouses are not tested for earthquakes. What we can suggest for you to do is to check the bolts and make sure everything is tightened after an earthquake or from time to time. The panels won’t pop out unless the frame is loose. The channels are made to fit the Polycarbonate snugly.

What does the ventilation fan do versus the auto openers in the roof?

Automatic vent openers are self-contained units which require no electricity. It is a temperature-sensitive device that automatically opens and closes a roof vent. So, they release heat and they basically require wind to make the air flow through the greenhouse.

The powered ventilation fan gives you more control. It removes excess heat by creating air movement throughout the greenhouse. However, it’s just a fan, not an AC unit. So, on very hot days, you’ll still experience higher temperatures inside your greenhouse.

Do the doors swing out or slide to the side? What is the door width?

It’s a hinged door so it swings. The door opening is 4ft x 6ft.

Where does it ship from?

Georgia, USA

Riverstone Monticello Greenhouse 8x20 with silver frame
Riverstone Monticello Greenhouse 8×20
$4,999.99 $4,499.90 Select options