Here are the only two that grow outdoors well for me, and both are aristolochioides hybrids. These are outdoors all year round on my deck. They've lived through freezes and 100 degree heatwaves. I water them with a hose.
First is N. ventricosa x aristolochioides, the most bulletproof nepenthes ever. I've had this on the deck for over 3 years now.
It's constantly flowering, but I think it's too cold overall to bake good seeds, so I've stopped trying.
it's around this time the pitchers start growing after a slow winter. Here are a few:
The other one that's decided it likes it out there is N. truncata x aristolochioides. This was dying on me in the grow room, and I put it out here to die, basically. that was 2 years ago. For whatever reason, it's happy now.