We are in Salem, Oregon and have our tree in a large container under a patio roof. We picked the 30 lemons last week and wonder now if we should uncover the tree and let it get cold and lose its leaves.
Dwarf Meyer’s Lemon Tree
Certified GKH Gardening Expert
You will need to keep the potted Lemon Tree in it's indoor and warm environment.
Exposure to cold will likely kill the plant.
You can reduce watering during the dormant period but maintain it's bright sunlight location and warm temperatures.
Here is some links with more information.