Preheat oven to 350 degrees F.
Spray a 9x5-inch loaf pan with nonstick cooking spray and set aside.
In a large bowl, mix together flour, baking powder, and salt.
In a medium bowl, beat together eggs, melted coconut oil, and honey.
Add the milk, lemon zest and lemon juice and mix until well combined.
Fold in grated zucchini and stir until combined.
Add the zucchini mixture to the dry ingredients and stir everything together, being sure to not over mix.
Pour batter into prepared loaf pan and bake for 45 minutes, or until a toothpick inserted in center of loaf comes out clean.
Cool loaf in pan for 10 minutes, then move to a wire rack and cool completely.
While loaf is cooling, mix together powdered sugar and lemon juice in a small bowl to make the glaze.
Spoon glaze over cooled loaf.
Let glaze set for a couple of minutes before serving.