The A&H Models site says that the Lenz track is usable outdoors. Maybe get a test piece to see firsthand, or discuss with them. And you're absolutely right - Peco is usable outdoors.
Originally Posted by Mathom:
Contacted GarGraves...
Q- Just getting into the hobby. I was pointed in your direction regarding running O-scale outdoors. Are the GarGraves O-scale 2 rail track (ties & turnouts) UV resistant?
A- We only make 2-Rail O Gauge in 37" flex track with wood ties and would not recommend it for outdoor use. I would suggest Atlas O 2 Rail track.
-Mark