Britta, I don't have a trampoline, so I can't be much personal help.

But in my small hometown, years and years ago, there was a family that had one. They took the mesh off, and left the frame outside all winter. I don't remember about the springs, in all honesty.

Thanks... that's probably what we're going to end up doing. Thought someone might have a blast of genious for me, though :) hehe

We are also first-time trampoline owners but without the enclosure (just a lot of rules and vigilance).

We are planning to buy a cover for it (see link). I like TS' clever idea to just leave the frame too!

Here is a link that might be useful: trampoline cover

We left ours out year-round even in Connecticut with no problems, but did not jump on it in weather below freezing due to it being brittle when cold. Was always fine when it warmed up, though.

What about the manufacturers themselves.. could you ring their customer help number and ask them? They should know what conditions the materials can handle. Some of those people can be really helpful and informative.