Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Wash the asparagus and trim away the tough, woody bottom ends, then place the spears on one side of the prepared baking sheet.
Place the salmon fillet on the other side of the baking sheet, ensuring there is space between the fish and the vegetables.
Whisk together the olive oil and lemon juice in a small bowl, then drizzle the mixture evenly over both the salmon and the asparagus.
Sprinkle the lemon zest, dried dill, garlic powder, sea salt, and black pepper over the entire tray.
Toss the asparagus spears with your hands or tongs to ensure they are well-coated in the oil and seasonings.
Roast in the center of the oven for 12 to 15 minutes, or until the salmon is opaque and flakes easily with a fork and the asparagus is tender-crisp.
Serve immediately, optionally garnishing with extra fresh herbs or a slice of lemon.