How Long to Cook Baked Salmon in the Oven at 400°F

Baked salmon is a simple oven-cooked fish dish made with a salmon fillet, olive oil, lemon, garlic, and herbs. At 400°F (204°C), a center-cut fillet about 1 inch thick generally needs 12–15 minutes; checking its temperature is the reliable way to know when it is done.

Ingredients

1 center-cut salmon fillet, skin on or off, about 1½ lb (680 g) and roughly 1 inch (2.5 cm) thick
1 tablespoon olive oil (15 ml)
¾ teaspoon kosher salt (about 4.5 g)
¼ teaspoon freshly ground black pepper (about 0.5 g)
2 garlic cloves, finely minced (about 6 g)
1 medium lemon (about 110 g), zested and juiced; reserve 4 thin slices for the top
1 tablespoon chopped fresh dill (about 3 g)

Instructions

Heat the oven and prepare the pan. Set a rack in the middle of the oven and preheat to 400°F (204°C). Line a rimmed baking sheet or shallow baking dish with parchment paper or foil. The lining makes cleanup easier, but it is not essential. While the oven heats, pat the salmon dry with paper towels. Drying the surface helps the oil and seasonings cling and avoids adding excess moisture to the pan.
Season the salmon. Put the fillet on the prepared pan, skin-side down if it has skin. Rub the top with olive oil, then sprinkle evenly with salt, pepper, minced garlic, lemon zest, and about half of the dill. Squeeze 1 tablespoon (15 ml) of lemon juice over the fish and arrange the lemon slices on top. If the fillet has a very thin tail end, tuck it under itself so the end is closer in thickness to the center and less likely to dry out.
Bake and check the thickest part. Bake uncovered for 12–15 minutes for a fillet about 1 inch (2.5 cm) thick. Start checking at 12 minutes; a thinner piece may finish sooner, while a thick center-cut portion can take longer. Insert an instant-read food thermometer sideways into the thickest part without touching the pan. USDA FSIS lists 145°F (63°C) as the safe minimum internal temperature for fish; cook until the thermometer reads 145°F (63°C). Do not rely only on the clock, color, or whether the fish flakes, since thickness and oven accuracy vary.
Rest briefly and serve. Once the salmon reaches 145°F (63°C), remove the pan from the oven and let the fish rest for 3 minutes. Sprinkle with the remaining dill and serve with the lemon slices or extra lemon wedges. If you baked one large fillet, use a thin spatula to separate it into portions along its natural flakes.

Tips

Use thickness as your timing guide. The 12–15-minute estimate is for salmon about 1 inch thick at its thickest point. A narrow tail piece will cook faster than a thick center piece, and two fillets of the same weight can therefore need different amounts of time. If pieces vary noticeably, check each one separately and take thinner pieces out once they reach 145°F (63°C).
Choose a substitute that suits the flavor. If fresh dill is unavailable, use 1 teaspoon dried dill (about 1 g), or substitute chopped parsley or chives in a similar amount. Dried dill tastes more concentrated and less fresh, so use less. Lime can stand in for lemon, although it gives the salmon a sharper, slightly different citrus flavor.
Keep the fillet in one piece when possible. A whole center-cut piece cooks more evenly than small uneven scraps. If using individual portions, place pieces of similar thickness together with a little space between them. Crowding the pan can trap steam and makes it harder to check each portion without breaking it.
Use a thermometer instead of guessing. Ovens can run hotter or cooler than their setting, and visual signs are not a dependable substitute for a temperature check. If you do not own an instant-read thermometer, the fish may look opaque and separate into flakes when gently pressed, but those signs alone do not confirm the USDA safe minimum temperature.

Serving Suggestions

Serve the salmon soon after its short rest, while it is warm and moist. Roasted potatoes, rice, couscous, or crusty bread make useful sides because they catch the lemony juices on the pan. For vegetables, pair it with roasted asparagus, green beans, broccoli, or a crisp salad. A simple plate with salmon, a cooked grain, and one green vegetable is filling without requiring another elaborate recipe.

For a quick sauce, stir a spoonful of the pan juices into plain yogurt with a little lemon juice and chopped dill, then serve it on the side. Alternatively, drizzle the fish with a little extra olive oil and squeeze fresh lemon over each portion. Add the sauce after baking rather than coating the salmon heavily before it goes into the oven; that keeps the seasoning clear and lets diners adjust the richness themselves.

Variations

Honey-mustard: Mix 1 tablespoon honey (21 g) with 1 tablespoon Dijon mustard (15 g) and spread a thin layer over the seasoned salmon before baking. The glaze will be sweeter and more browned at the edges, so begin checking at the early end of the time range. Still use the thermometer to confirm 145°F (63°C).

Garlic butter: Replace the olive oil with 1 tablespoon melted unsalted butter (14 g), or use half butter and half olive oil. Add extra minced garlic if you like a stronger savory flavor. Butter can brown more readily than oil, so keep an eye on the surface, especially if your oven tends to run hot.

Herb and spice: Swap dill for parsley, thyme, or a small pinch of smoked paprika. Use about 1 tablespoon fresh chopped parsley (4 g), or 1 teaspoon dried thyme (about 1 g). These options change the character of the dish but do not change the doneness target. Avoid adding a thick layer of wet herbs or sauce, which can make the surface less likely to brown.

Individual portions: Divide about 1½ pounds (680 g) of salmon into four pieces before seasoning. Portions around 1 inch thick can use the same 12–15-minute starting range, but smaller or thinner pieces may cook sooner. Check the center of the thickest portion and remove each piece as it reaches the safe temperature rather than assuming all portions finish together.

Storage and Reheating

Refrigerate leftover salmon within 2 hours of cooking, storing it in a shallow airtight container. It keeps for 3–4 days in the refrigerator. If the cooked fish has been left at room temperature for more than 2 hours, discard it rather than saving it. For longer storage, freeze cooled portions in a freezer-safe airtight container; for best quality, use them within about 2–3 months. Thaw frozen portions in the refrigerator, not on the counter.

To reheat, place a portion in a covered oven-safe dish with a teaspoon of water or broth and warm it in a 275°F (135°C) oven. Check with a food thermometer and heat leftovers to 165°F (74°C), the USDA FSIS reheating temperature. The low oven helps limit drying, though the fish may become firmer than when freshly baked. A microwave also works: cover the fish loosely, heat in short intervals, and check the center for 165°F (74°C). Reheat only the amount you plan to eat.

Frequently Asked Questions

How long does salmon take to bake at 400°F? A fillet about 1 inch (2.5 cm) thick usually takes 12–15 minutes at 400°F (204°C). Begin checking at 12 minutes and use a food thermometer at the thickest point. Thinner pieces may be ready sooner, while a thicker fillet can take longer; reaching 145°F (63°C) is more dependable than following a fixed time alone.

Should I bake salmon covered or uncovered? Bake it uncovered for this recipe. That lets excess moisture escape and keeps the surface from steaming under foil. Covering can be useful if a topping is browning too quickly, but it may change the texture and add a little cooking time. Whether covered or uncovered, check the thickest part with a thermometer and cook to 145°F (63°C).

Do I need to flip salmon in the oven? No. Place the salmon skin-side down, if it has skin, and leave it in place while it bakes. The oven cooks it from all sides without flipping, and turning a soft fillet can make it break apart. If the skin sticks to the pan, slide a thin spatula between the flesh and skin when serving; the skin may remain on the liner.

Can I bake salmon straight from frozen? For the most even result, thaw it overnight in the refrigerator and pat it dry before seasoning. You can cook salmon from frozen, but it will take longer and the seasoning may not adhere as well to the icy surface. Follow the package directions if available, check the thickest portion with a thermometer, and do not serve it until it reaches 145°F (63°C).

How can I tell if salmon is done without a thermometer? Cooked salmon generally looks opaque and separates into flakes when gently pressed with a fork. Those visual cues can help you assess texture, but they cannot verify the safe minimum temperature as reliably as a thermometer. If you cook fish often, an instant-read thermometer is a useful tool; check the center of the thickest section rather than the surface.

Can I prepare the salmon ahead of time? You can season it and keep it covered in the refrigerator for a short period before baking, but for the best texture, bake it shortly before serving. Avoid leaving raw fish at room temperature while waiting for the oven. If you prepare it in advance, keep it refrigerated and allow a few extra minutes if it goes into the oven very cold; judge doneness by temperature, not by adding time automatically.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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