Fresh Ham (Uncooked)
at 325°F
The answer
4 hr 25 min – 5 hr 10 minat 325°F
Plan on 22 to 26 minutes per pound in a 325°F oven. A 12 lb fresh ham (uncooked) lands around 4 hr 25 min – 5 hr 10 min. Done is 145°F on a food thermometer, plus a 20-minute rest — never the clock alone.
SOURCE·USDA FSIS safe minimum internal temperatures·325°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 an uncooked fresh ham it opens at 145°F and a 20-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 an uncooked fresh ham — 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 325°F: 22–26 min/lb, cross-checked against at least three independently published sources.
- Scale. Multiply that rate by your weight. A 12 lb piece lands at 4 hr 25 min – 5 hr 10 min; 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 20 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 × 22 min/lb
plan_high = weight_lb × 26 min/lb
first_check = plan_low × 0.85
DONE ⟺ internal_temp ≥ 145°F AND rest ≥ 20 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 fresh ham (uncooked). The right-hand column is when to take the first thermometer reading.
| Weight | Estimated time at 325°F | Check thermometer from |
|---|---|---|
| 8 lb | 2 hr 55 min – 3 hr 30 min | 2 hr 30 min in |
| 9 lb | 3 hr 20 min – 3 hr 55 min | 2 hr 50 min in |
| 10 lb | 3 hr 40 min – 4 hr 20 min | 3 hr 5 min in |
| 11 lb | 4 hr – 4 hr 45 min | 3 hr 25 min in |
| 12 lb | 4 hr 25 min – 5 hr 10 min | 3 hr 45 min in |
| 13 lb | 4 hr 45 min – 5 hr 40 min | 4 hr 5 min in |
| 14 lb | 5 hr 10 min – 6 hr 5 min | 4 hr 20 min in |
| 15 lb | 5 hr 30 min – 6 hr 30 min | 4 hr 40 min in |
| 16 lb | 5 hr 50 min – 6 hr 55 min | 5 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 145°F on a food thermometer.
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 20 minutes. The clock estimates; the thermometer decides. Every time on this page is a planning range, not a doneness test.
Source note: 22–26 min/lb at 325°F for a whole fresh leg is the USDA FSIS published timetable. This is raw pork roast — the 140°F reheat rule for cured 'city' hams does not apply.
SOURCE·USDA FSIS safe minimum internal temperatures·fresh ham (uncooked) 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
- A fresh ham is simply the pig's rear leg, uncured — it roasts like an enormous pork loin and tastes of pork roast, not of 'ham'.
- Score the skin in a diamond pattern; at 325°F it renders into crackling by the end of the long cook.
- This is one of the longest oven cooks in this book — a 14 lb fresh ham is a 5–6 hour project.
Answers people ask
How long does an uncooked fresh ham take at 325°F?
Plan on 22 to 26 minutes per pound at 325°F. A 12 lb example takes about 4 hr 25 min – 5 hr 10 min. It is done when the internal temperature reaches 145°F on a food thermometer, not when the clock runs out.
What internal temperature is an uncooked fresh ham done at?
145°F, measured with a food thermometer in the thickest part, then rested about 20 minutes. That is the USDA FSIS safe minimum.
Is 325°F a good temperature for an uncooked fresh 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
