🍜 Jammy eggs at altitude

What “jammy” means here

Jammy is the middle setting on the calculator: the white is fully set, the yolk is thick and glossy, and it spreads slowly instead of pouring. That is the egg people want on ramen, avocado toast, and a rice bowl. It is also the doneness sea-level advice most often misses at elevation, because “seven minutes” at 95°C is still a soft egg.

If you want it to run, use soft-boiled. If you want to mash it, use hard-boiled. Jammy is the band between those, and it is narrow. Time it with the boiling eggs at altitude calculator set to jammy rather than splitting the difference by eye.

High-altitude timing is most obvious here

Soft yolks still look like yolks when they are a bit under. Hard yolks at least finish if you overshoot. Jammy is the one that turns into “why is this still liquid?” when you copy a coastal blog. The calculator’s altitude factor (about 3% extra time per degree the boiling point sits below 100°C) is doing the work you would otherwise guess wrong.

A large egg, fridge-cold, hot-water start is the usual ramen case. At sea level that is on the order of seven minutes of boiling; at 1,600 m it is noticeably longer. Extra-large eggs, a pot with more than four eggs, and a cold-water start each add time on top. The form on the homepage stacks those; this page is not a second chart.

Hot-water start is worth it for jammy eggs. You want a known start, because the difference between jammy and soft is not a leisurely minute. Cold-water start is fine if you select it on the calculator so the heat-up is in the number.

Pan-side routine

1. Open the boiling eggs at altitude calculator, set doneness to jammy, and fill in altitude, size, starting temperature, water start, and count.
2. Use eggs you can peel. Very fresh eggs fight you; jammy whites are tender and tear if you rush the shell.
3. Lower into a lively simmer or gentle boil. A violent rolling boil knocks yolks off-center.
4. When the timer ends, get them out. Jammy yolks set the rest of the way in hot water in less time than it takes to find a bowl.

Immediately put cooked eggs in cold water to make them easy to peel. Ice water for a few minutes also stops them from cooking further in the shell, which matters more after the extra time altitude already added.

Peel after they are cold enough to handle. For ramen eggs, peel now and marinate; the soy bath is not a substitute for hitting jammy in the pot. If the yolk is still runny after a peel-and-check, raise altitude accuracy first (detect it), then egg size, before you start adding random minutes.

Jammy vs the other two

Jammy is the meal-prep middle: sliceable enough for a bowl, rich enough that you would not want it in egg salad. Soft is breakfast. Hard is mash and packing. The three methods share the same pot science; the science page is the write-up of why the water is cooler.