Ham (Fully Cooked, Bone-In)
at 325°F
The answer
2 hr 30 min – 3 hrat 325°F
Plan on 15 to 18 minutes per pound in a 325°F oven. A 10 lb ham (fully cooked, bone-in) lands around 2 hr 30 min – 3 hr. Done is 140°F on a food thermometer, plus a 15-minute rest — never the clock alone.
SOURCE·USDA FSIS safe minimum internal temperatures·325°F planning range derived·REVIEWED JUL 2026
USDA safe zone — 140°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 fully cooked bone-in ham it opens at 140°F and a 15-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 fully cooked bone-in ham — its safe minimum internal temperature of 140°F, and the FSIS roasting timetable where one exists for this cut.
- Rate. Convert the anchor into a planning rate at 325°F: 15–18 min/lb, cross-checked against at least three independently published sources.
- Scale. Multiply that rate by your weight. A 10 lb piece lands at 2 hr 30 min – 3 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 140°F in the thickest part, then rests about 15 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 × 15 min/lb
plan_high = weight_lb × 18 min/lb
first_check = plan_low × 0.85
DONE ⟺ internal_temp ≥ 140°F AND rest ≥ 15 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 325°F
Planning ranges for a fully thawed, fridge-temperature ham (fully cooked, bone-in). The right-hand column is when to take the first thermometer reading.
| Weight | Estimated time at 325°F | Check thermometer from |
|---|---|---|
| 6 lb | 1 hr 30 min – 1 hr 50 min | 1 hr 15 min in |
| 7 lb | 1 hr 45 min – 2 hr 5 min | 1 hr 30 min in |
| 8 lb | 2 hr – 2 hr 25 min | 1 hr 40 min in |
| 9 lb | 2 hr 15 min – 2 hr 40 min | 1 hr 55 min in |
| 10 lb | 2 hr 30 min – 3 hr | 2 hr 10 min in |
| 11 lb | 2 hr 45 min – 3 hr 20 min | 2 hr 20 min in |
| 12 lb | 3 hr – 3 hr 35 min | 2 hr 35 min in |
| 13 lb | 3 hr 15 min – 3 hr 55 min | 2 hr 45 min in |
| 14 lb | 3 hr 30 min – 4 hr 10 min | 3 hr 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 140°F on a food thermometer.
SOURCE·USDA safe-temperature guidance·timing ranges derived, see method·REVIEWED JUL 2026
When it is actually done
140°F internal
The USDA FSIS safe minimum internal temperature for this cut is 140°F, followed by a rest of about 15 minutes. The clock estimates; the thermometer decides. Every time on this page is a planning range, not a doneness test.
Source note: A 'fully cooked' or 'ready to eat' ham is only being reheated — USDA FSIS says 140°F for a packaged ham (15–18 min/lb for a whole ham, 18–24 for a half). An UNCOOKED fresh ham is a different cut with different rules — see Fresh Ham.
SOURCE·USDA FSIS safe minimum internal temperatures·ham (fully cooked, bone-in) 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
- Check the label first: 'fully cooked' reheats to 140°F; 'cook before eating' must reach 145°F like fresh pork.
- Add the glaze in the last 20–30 minutes at a raised 400°F — brown sugar burns over a 2-hour reheat.
- A spiral-cut ham dries out faster; reheat it covered with foil and a splash of liquid in the pan, at the low end of the range.
Answers people ask
How long does a fully cooked bone-in ham take at 325°F?
Plan on 15 to 18 minutes per pound at 325°F. A 10 lb example takes about 2 hr 30 min – 3 hr. It is done when the internal temperature reaches 140°F on a food thermometer, not when the clock runs out.
What internal temperature is a fully cooked bone-in ham done at?
140°F, measured with a food thermometer in the thickest part, then rested about 15 minutes. That is the USDA FSIS safe minimum.
Is 325°F a good temperature for a fully cooked bone-in ham?
It is the standard published temperature for this cut.
SOURCE·USDA FSIS safe minimum internal temperatures·doneness figures quoted in these answers·REVIEWED JUL 2026
More pork timings
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
