The covering of the Greenhouse makes all the difference on how much protection your GeoDome will give you. A single layer of greenhouse plastic poly keeps a greenhouse 4 degrees warmer at night than the outside temperature. Adding another layer of plastic poly filled with air in between would more then double the protection. Also double walled polycarbonate panels would significantly increase the protection. Depending on how much protection you want, get creative with the cover.
Because of the shape of the dome covering can be tricky. Acidome calculator calculates nicely the size of the facets, which is especially important for pricier coverings.
Covering the GeoDome Greenhouse with greenhouse plastic film
We covered our dome with used greenhouse plastic poly that was given to us from a commercial greenhouse. It still had plenty of life left. With our free plastic cover we simply laid the struts on the plastic and cut the 2-3 facets approximately. Cutting the plastic for 3 facets in a row worked the best. Any overlaps we trimmed with a utility knife.
First we stapled the plastic to the struts and then used the 1 cm planks to hold it in place which also pointed out the structure of the GeoDome even more. We like it :).
Covering the GeoDome Greenhouse with Shrink Film
Shrink film comes in different colors as well as transparent. Because of the dome shape, it makes sense to use shrink film. As far as frost protection goes, it would be about the same as greenhouse plastic. This video shows how to cover a GeoDome Greenhouse with Shrink Wrapping
Covering the GeoDome Greenhouse with polycarbonate panels
Here is a great tutorial about how to cover a GeoDome Greenhouse with polycarbonate panels.
If you want to build a Geodesic Dome too, we share a step by step How to build a GeoDome Greenhouse.
A Geodesic Greenhouse Book: Building and Using a Solar-Heated Geodesic Greenhouse.