How Long to Cook Foil-Wrapped Salmon in the Oven

Foil-wrapped salmon usually takes 14–18 minutes in a 400°F (200°C) oven when the fillets are about 1 inch thick. The sealed packet traps steam around salmon, lemon, and herbs, making a simple, moist main dish; check the thickest part with a food thermometer rather than relying on time alone.

Ingredients

4 skin-on or skinless salmon fillets, about 6 oz (170 g) each and 1 inch (2.5 cm) thick; about 1 1/2 lb (680 g) total
1 tbsp (15 ml) olive oil
1 tbsp (14 g) unsalted butter, cut into 4 small pieces
1 medium lemon, half thinly sliced and half cut into wedges for serving, about 4 oz (115 g)
3/4 tsp (4.5 g) fine salt
1/4 tsp (0.5 g) freshly ground black pepper
1 tsp (1 g) finely chopped fresh dill, plus extra to serve
1 small garlic clove, finely grated or minced, about 1 tsp (3 g)
4 sheets heavy-duty aluminum foil, about 12 by 16 inches (30 by 40 cm) each

Instructions

Heat the oven and prepare the foil. Set a rack in the middle of the oven and preheat to 400°F (200°C). Tear four generous foil sheets and arrange them on a rimmed baking sheet. The tray makes the packets easier to move and catches any drips if a seam loosens. If using regular, thin foil, stack two sheets for each packet so they are less likely to tear.
Prepare the salmon. Pat the fillets dry with paper towels, then check for pin bones by running clean fingertips along the center line. Pull out any bones with clean tweezers. Dry surfaces help the seasoning cling, though the enclosed packet will not brown the fish. If your portions vary in thickness, group similarly sized pieces together so they finish at about the same time.
Season and assemble. Set one fillet in the center of each foil sheet. Brush or drizzle the salmon with the olive oil, then divide the salt, pepper, garlic, and chopped dill evenly among the portions. Add one piece of butter and two or three lemon slices to each fillet. Keep the lemon on top rather than laying a thick layer underneath, where it can hold the fish above the juices and slow even cooking.
Seal the packets. Bring the long sides of the foil together over the fish and fold them down two or three times, leaving a little space above the salmon for steam to circulate. Fold the short ends up tightly. The packets should be closed but not pressed flat against the fillets. Set them seam-side up on the baking sheet. Avoid making the folds so tight that the foil pulls or splits.
Bake, then check the temperature. Bake the packets for about 16 minutes for 1-inch-thick fillets. Start checking at 14 minutes if the portions are thinner, and expect closer to 18 minutes for thicker pieces or a crowded oven. Carefully open one packet away from your face because hot steam escapes. Insert a food thermometer into the thickest part of a fillet, from the side if possible. USDA FSIS sets 145°F (63°C) as the safe minimum internal temperature for fish. If it has not reached 145°F (63°C), reseal the packet and bake for another 2 minutes before checking again.
Rest and serve. Once the fish reaches 145°F (63°C), take the tray out and leave the packets closed for 3 minutes. Open them carefully, keeping hands clear of the steam. Spoon a little of the buttery lemon juice over each portion and finish with fresh dill and lemon wedges. Serve promptly.

Tips

Use thickness as your timing guide. The 14–18-minute range assumes fillets near 1 inch thick at the thickest point. A thin tail piece may be ready sooner, while a 1 1/2-inch center-cut portion can need longer. Check early, then add time in short increments; oven accuracy, starting temperature, and the size of the portions all affect the result.
Keep packets separate and roomy. Give each fillet its own packet, and leave space around the fish inside. Overlapping several portions in one tightly packed parcel can make cooking uneven. If you have a large side of salmon, cut it into portions of similar thickness or use a larger, loosely tented foil packet and check several spots.
Choose a simple swap for the herbs or fat. Parsley or chives can replace dill in equal volume, with a milder, less grassy flavor. Use 1 tablespoon (15 ml) melted butter instead of olive oil, or use another tablespoon of olive oil instead of the butter for a dairy-free version. The fish will still steam in the packet, though the flavor and richness will change.
Season with care and open safely. If your butter is salted, reduce the added salt to 1/2 teaspoon (3 g). Do not rely on the packet juices to show whether salmon is done; check the thickest part with a thermometer. Lift the foil flap away from your face and hands, since trapped steam can burn.

Serving Suggestions

Serve the salmon straight from its opened foil packet for an easy weeknight presentation, or transfer it with a thin spatula to warm plates. Spoon the lemon-butter juices over the top, but taste before adding more salt because the juices concentrate slightly as they collect. A wedge of lemon and a pinch of fresh dill add a bright finish without needing a separate sauce.

For a balanced plate, pair the fish with steamed rice, roasted baby potatoes, couscous, or buttered noodles, plus a green vegetable such as asparagus, green beans, or broccoli. If you want a lighter accompaniment, serve it with a crisp cucumber salad or leafy greens dressed with a little vinegar. The packets do not produce crisp skin or browned edges, so pair the tender fish with a side that supplies crunch, such as toasted bread or a simple slaw.

If serving several people, open the packets at the table or carefully move the fish to a platter and pour the juices over it. Keep the foil on the tray rather than placing it directly on a table surface, and warn diners that the packets and their contents remain hot. For a meal with varied preferences, offer lemon wedges and extra chopped herbs on the side so each person can finish their portion as desired.

Variations

Garlic-herb version: Add 1 tablespoon (4 g) chopped parsley and 1 teaspoon (2 g) chopped thyme along with the dill, or use those herbs instead. Fresh herbs bring a softer, greener flavor. If using dried herbs, use about 1/2 teaspoon (0.5 g) total in place of the fresh dill, since dried herbs are more concentrated.

Honey-mustard version: Stir together 1 tablespoon (15 ml) Dijon mustard and 2 teaspoons (14 g) honey, then spread a thin layer over each fillet before sealing. This gives the salmon a sweet-tangy coating, but it will remain soft rather than caramelizing inside the packet. Keep the same oven temperature and use the thermometer, as the glaze does not change the safe internal temperature.

Mediterranean-style version: Replace the butter with 1 tablespoon (15 ml) extra olive oil and add 1/4 cup (35 g) halved cherry tomatoes and 2 tablespoons (15 g) sliced pitted olives to each packet. The tomatoes release liquid as they cook, making a light, savory sauce. Use less salt at first because olives can be salty, and adjust at the table.

Use another citrus: Thin orange slices make the dish sweeter and gentler, while lime gives it a sharper flavor. You can also use a teaspoon of lemon zest if you want lemon aroma without as much juice. Keep the added citrus modest; a large amount of acidic juice can make the salmon taste overly tart, even though the foil packet contains the liquid.

Storage and Reheating

Remove leftover salmon from the foil and refrigerate it within 2 hours of cooking, sooner if the room is very warm. Store it in a covered, airtight container with any cooking juices, and use it within 3–4 days. Keeping the portions whole and retaining a little of the sauce helps them stay moist. Do not leave cooked fish at room temperature for longer than 2 hours.

For best texture, reheat only the portion you plan to eat. Put the salmon in a covered oven-safe dish with a spoonful of its juices or water, and warm it in a 275°F (135°C) oven until a food thermometer reads 165°F (74°C), the safe temperature for reheated leftovers. The time varies with portion size, so use the temperature rather than a fixed minute count. You can also microwave it in short bursts in a covered, microwave-safe dish, checking the temperature in the center and allowing a brief pause between bursts.

Cooked salmon can be frozen in an airtight freezer-safe container for about 2–3 months for best quality. Thaw it in the refrigerator rather than on the counter, then reheat to 165°F (74°C). The texture may be a little softer after freezing and thawing, so flaked leftover salmon also works well cold in a salad or sandwich, as long as it has been properly refrigerated.

Frequently Asked Questions

How long does foil-wrapped salmon take at 400°F?

Plan on about 14–18 minutes for individual fillets around 1 inch thick, with 16 minutes as a useful first check. Thinner pieces can finish earlier, and thick center-cut pieces may need additional time. The dependable endpoint is 145°F (63°C) in the thickest part, checked with a food thermometer.

Should I bake salmon in foil at 375°F or 400°F?

Both temperatures work. At 400°F (200°C), the fillets in this recipe usually cook in 14–18 minutes; at 375°F (190°C), they generally take longer, often around 18–22 minutes depending on thickness. Keep the packet method the same and check the fish rather than assuming that a particular time guarantees doneness.

Do I need to flip salmon in a foil packet?

No. The foil surrounds the fish, and hot air and steam cook it from all sides, so flipping is unnecessary and can tear the packet. Place the fillet skin-side down if it has skin; the skin helps keep the flesh in one piece, though it will not become crisp while enclosed.

Can I put vegetables in the same foil packet?

Yes, but choose vegetables that cook quickly, such as thinly sliced zucchini, asparagus pieces, or cherry tomatoes, and keep the layer modest. Dense vegetables like raw potatoes and thick carrot pieces need more time than salmon, so cook them first or cut them very small and thin. Do not crowd the packet, and check the salmon separately with a thermometer.

Can I cook frozen salmon in foil without thawing it?

It is possible, but timing is less predictable and the fish may release more liquid. For more even results, thaw salmon in the refrigerator before cooking, then pat it dry and follow the recipe. If cooking from frozen, do not use the fresh-fillet timing: bake longer, open the packet carefully, and verify that the thickest part reaches 145°F (63°C) before serving.

How can I tell if salmon is done without a thermometer?

Flaking easily and looking opaque through the center are visual clues, but they are less reliable than a thermometer and can lead to overcooking. For the food-safety endpoint, check the thickest part with a thermometer and cook fish to 145°F (63°C). If you do not have one, use the visual signs only as a rough guide and avoid serving fish that still looks translucent in the center.

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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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