what kind of guppies, fancy or Endlers? I've read previously that Endler's are more cold tolerant than fancy guppies but I think some of these judgments are subjective rather than actually researched.
There's someone here who has a pond of guppies in Canada so apparently anything is possible. If you search the group under "guppy" you might find her, I'm blanking on the name ATM. All the aquarium websites will tell you guppies will get sick and struggle at cold temps, and that may be true and it also may be true that they breed so fast you don't really notice. I guess it depends on how much the lives and health of the individual guppies matter to you? if you have just a few guppies and each is a treasured pet I would really hesitate to put them in a pond in the UK. I don't even put my guppies in my pond here in san diego because it's too cold for them in the winter, even though it doesn't freeze. What does "warm in the winter" mean for your pond exactly?
