Posted: 30/07/2014 at 20:55
I tend to lift and eat the beetroot as they are ready; at this time of year we plan our meals around what's ready in the garden.
During the growing season beetroot keep best in the soil, but they need lifting before the frosts can damage them.
Philippa's right, we used to build a soil root clamp - a smaller version of the way farmers would store fodder beet to feed their cattle through the winter.
This site gives more information https://www.rhs.org.uk/advice/profile?PID=666
Hope that's helpful