I recently bought a small HB pummelo from HD. I used it to topwork my existing ruby red grapfruit because I hate grapefruit but I really like the pummelo's. Is the pummelo similar in terms of cold hardiness to the grapefruit? My grapefruit was on of my few trees that never really took any significant damage. I am in Ocala FL which tends to see some pretty cold temps in the winter (especially last winter). Thanks for any info, I am hoping I did not make a mistake. The grapefruit was a nice huge productive tree. I did leave two small grapefruit branches just because I could not make myself totally lose the grapefruit portion (made the tree very sad looking right now).

The pomello I got from Joe (Butan Pomello I think) was grafted onto my sister's Owari Satsuma over in Alabama. It did not get any protection during the cold--temps went down to at least 18--my sister says it was even lower. The satsuma and the pomello both survived with little damage, there was a lemon on the satsuma that was defoliated.

Good to know. Thanks. 18 is about the lowest we saw as well.

There are possibly two issues to consider, the cold hardiness of the tree, and also the fruit quality of the pummelo variety in colder areas. Some varieties grow well in temperate areas, but the fruit flavor is never as good as when the var is grown in the tropics. Other vars produce acceptable fruit in temperate areas. Buntan types fron Japan may be a good choice for humid summer, cool winter areas.

I think I definitely get plenty of heat. It is above 90 for the majority of the summer. I just usually get a month or two of times when it can get very cold. When we do get cold it is only for a few nights at a time during normal winters.

In northern Victoria, with very hot summers and mild winters, there are two Agriculture research stations ( CSIRO and Dareton, NSW ). The Pummelos in the research collection mainly have sourish fruit, nothing like those from Nth Queensland. Tahitian and a "Shaddock" however, produce very edible fruit.
Perhaps for tropical vars, heat is required while the fruit is developing to obtain flavor. Your location sounds a bit more subtropical ? , so probably ok.