Preheat your oven to 400°F (200°C).
Line a large baking sheet with parchment paper.
Arrange the salmon fillets on one side of the baking sheet.
In a small bowl, whisk together the olive oil, lemon juice, lemon zest, thyme, parsley, garlic, salt, and pepper.
Pour most of the marinade evenly over the salmon, reserving a small amount.
Add the asparagus beside the salmon and drizzle with the remaining marinade. Toss gently to coat.
Bake the Sheet Pan Lemon Herb Salmon with Asparagus for 12–13 minutes, or until the salmon flakes easily with a fork and reaches an internal temperature of 145°F.
Remove from the oven and serve immediately with fresh lemon wedges if desired.