Whole Salmon
at 400°F
The answer
45 min – 1 hrat 400°F
Plan on 9 to 12 minutes per pound in a 400°F oven. A 5 lb whole salmon lands around 45 min – 1 hr. Done is 145°F on a food thermometer, plus a 5-minute rest — never the clock alone.
SOURCE·USDA FSIS safe minimum internal temperatures·400°F planning range derived·REVIEWED JUL 2026
USDA safe zone — 145°F and above
Done is a temperature, not a time. Every figure on this page is a planning range; the green band is the only part that decides. For a whole salmon it opens at 145°F and a 5-minute rest.
Source—USDA Food Safety & Inspection Service safe minimum internal temperatures—retrieved 2026-07
How this is worked out
- Anchor. Start from what USDA FSIS publishes for a whole salmon — its safe minimum internal temperature of 145°F, and the FSIS roasting timetable where one exists for this cut.
- Rate. Convert the anchor into a planning rate at 400°F: 9–12 min/lb, cross-checked against at least three independently published sources.
- Scale. Multiply that rate by your weight. A 5 lb piece lands at 45 min – 1 hr; the range is widened to cover source disagreement rather than averaged into false precision.
- First check. The first thermometer reading is set at 85% of the low end of the range — early enough that an under-reading costs nothing and a late one cannot cost the meal.
- Gate. The time is only a plan. It is not done until a food thermometer reads 145°F in the thickest part, then rests about 5 minutes. Time never overrides temperature on this site.
- Round. Every printed figure is rounded to the nearest 5 minutes; precision beyond that would be invented.
plan_low = weight_lb × 9 min/lb
plan_high = weight_lb × 12 min/lb
first_check = plan_low × 0.85
DONE ⟺ internal_temp ≥ 145°F AND rest ≥ 5 min
(USDA FSIS — the gate, not the clock)
SOURCE·USDA FSIS safe minimum internal temperatures·safe minimum for this cut·REVIEWED JUL 2026
Time by weight at 400°F
Planning ranges for a fully thawed, fridge-temperature whole salmon. The right-hand column is when to take the first thermometer reading.
| Weight | Estimated time at 400°F | Check thermometer from |
|---|---|---|
| 3 lb | 25 min – 35 min | 25 min in |
| 3.5 lb | 30 min – 40 min | 25 min in |
| 4 lb | 35 min – 50 min | 30 min in |
| 4.5 lb | 40 min – 55 min | 35 min in |
| 5 lb | 45 min – 1 hr | 40 min in |
| 5.5 lb | 50 min – 1 hr 5 min | 40 min in |
| 6 lb | 55 min – 1 hr 10 min | 45 min in |
| 6.5 lb | 1 hr – 1 hr 20 min | 50 min in |
| 7 lb | 1 hr 5 min – 1 hr 25 min | 55 min in |
Start checking the internal temperature well before the low end of the range — an early check costs nothing; a late one costs the meal. Done means 145°F on a food thermometer.
SOURCE·USDA safe-temperature guidance·timing ranges derived, see method·REVIEWED JUL 2026
400°F vs the other temperatures
Same cut, every temperature this site publishes for it.
| Oven temp | Time for a 5 lb whole salmon | Per pound |
|---|---|---|
| 375°F | 50 min – 1 hr 5 min | 10–13 min/lb |
| 400°F (this page) | 45 min – 1 hr | 9–12 min/lb |
SOURCE·USDA safe-temperature guidance·timing ranges derived, see method·REVIEWED JUL 2026
When it is actually done
145°F internal
The USDA FSIS safe minimum internal temperature for this cut is 145°F, followed by a rest of about 5 minutes. The clock estimates; the thermometer decides. Every time on this page is a planning range, not a doneness test.
SOURCE·USDA FSIS safe minimum internal temperatures·whole salmon row of the FSIS chart·REVIEWED JUL 2026
The clock tells you when to start looking. The thermometer tells you when to stop.
What the ledger does not tell you
- Measure at the thickest point behind the head; the tail will always be more done — tuck foil around the tail if it matters to you.
- Stuffing the cavity with lemon and herbs barely changes the time; stuffing it densely with anything else does.
- The skin peels off in one satisfying sheet after cooking — leave it on for the oven.
Answers people ask
How long does a whole salmon take at 400°F?
Plan on 9 to 12 minutes per pound at 400°F. A 5 lb example takes about 45 min – 1 hr. It is done when the internal temperature reaches 145°F on a food thermometer, not when the clock runs out.
What internal temperature is a whole salmon done at?
145°F, measured with a food thermometer in the thickest part, then rested about 5 minutes. That is the USDA FSIS safe minimum.
Is 400°F a good temperature for a whole salmon?
It is one of 2 temperatures this site publishes for this cut (375°F, 400°F). Lower runs longer and more forgiving; higher runs faster with more browning. 375°F is the most common choice.
SOURCE·USDA FSIS safe minimum internal temperatures·doneness figures quoted in these answers·REVIEWED JUL 2026
Where these numbers come from
Ranges are anchored to USDA FSIS published timetables where they exist, and derived from that anchor plus cross-checked published sources where they do not — widened to cover the disagreement between sources rather than split down the middle. The full reasoning is on the method page. If a figure here looks wrong, say so — corrections are prioritised.
SOURCE·USDA safe-temperature guidance·timing ranges derived, see method·REVIEWED JUL 2026
