Ready to start your first grow operation or looking to add to an established farm? Our customizable 10 ft. High Tunnel Greenhouse Kit makes it easy to create enough space on your home or business property, no matter the scope of your project. We offer our kit in various lengths ranging from 20 to 100 feet because we know that space and budget are primary concerns no matter the size or volume of your farming operations. Check out our other sizes here. This kit will require the purchase of wood and metal locally. For complete kits, check out our All-Metal Greenhouse kits.
Please be aware that this kit does not include the lumber and 1 3/8" Top Rail required for greenhouse construction; that is because we cannot ship those items and still offer the best possible price on a high-quality greenhouse. We recommend purchasing them from your local home improvement store, and we’ve provided information below from Lowe’s and Home Depot on their part numbers for those items and their respective prices. Need construction tips? Our step-by-step guide will help you through every step of the process.
Greenhouse Building Instructions Here
Greenhouse Width (ft) |Approximate Height (ft)
10 |8.5
12 |8
16 | 9.5
20 |10.75
* Lumber choices may be limited by location. Redwood, cedar, or pressure-treated are the best choices for any structure that will be exposed to moisture.
Grew these for the past three years and I will keep growing them for many more. I highly recommend them. Great germination rate. Every onion grew to the size of baseballs and others a bit bigger and they store very well.Best long day onion I have ever grow.
I am very happy with my heirloom seeds. I cannot wait to germinate them.
Started my seeds on 12/31/25. I’ve had almost 100% germination and the onion seedlings are a couple of inches tall at this point (1/9/26). Looking forward to a great harvest!
Grew these last year, so I bought more seeds! they were awesome, very prolific and tasted great!!
I started them early....did waterjug winter seed starts .. they did very well....grew up to be nice sturdy plants, bearing lots of fruit! Thank You!!