I've got a small trident maple that I've had for a couple of years. I'm
thinking of letting it grow out to get larger and develop trunk caliper. It
just wintered outdoors with the rest of my trees in what people tell me is
about as harsh a winter as they get here.

I have wintered trident maples outdoors successfully in Zone 5, but not this
year. I would put it in a sheltered, south facing bed. If it is not too big,
use a rose cone or some other protection.


Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)